Processing method of magnesium alloy assembly, magnesium alloy assembly and electronic equipment

Abstract

The invention discloses a magnesium alloy assembly machining method, a magnesium alloy assembly and electronic equipment, and relates to the field of metal surface treatment.The magnesium alloy machining method comprises the steps that a magnesium alloy workpiece is provided; cNC highlight treatment is conducted on the first area of the magnesium alloy workpiece to form a highlight face, cutting fluid used during highlight effect CNC highlight treatment forms a first transparent protective layer on the outer side of the highlight face, and the cutting fluid at least comprises alkyl sulfonate and a surfactant. According to the machining method of the magnesium alloy assembly, provided by the embodiment of the invention, the cutting fluid capable of forming the first transparent protective layer is provided, protection on the highlight surface is formed while cutting is completed, the situation that the highlight surface is prone to being corroded and losing gloss when making contact with oxygen and water is avoided, additional polishing on the highlight surface is not needed, and the machining efficiency is improved. Therefore, the magnesium alloy component with better metal highlight texture is prepared.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal surface treatment, and in particular to a magnesium alloy component processing method, a magnesium alloy component and an electronic device. BACKGROUND

[0002] Smartphones, tablet computers and other electronic devices have become an indispensable part of people's daily life. With the continuous pursuit of thinness of electronic devices by consumers, appearance housings made of magnesium alloy, which has a smaller density than aluminum alloy, are increasingly widely used. However, the chemical properties of magnesium alloy are relatively active, which causes the appearance housing made of magnesium alloy to be easily corroded during preparation, and a metal high-brightness quality and a more sophisticated appearance cannot be achieved, resulting in a low preparation yield. SUMMARY

[0003] Embodiments of the present application provide a magnesium alloy component processing method, a magnesium alloy component and an electronic device, which are used to solve the technical problem that appearance housings made of magnesium alloy are easily corroded during preparation.

[0004] To achieve the above object, embodiments of the present application adopt the following technical solutions:

[0005] In a first aspect, the present application provides a magnesium alloy component processing method, which comprises:

[0006] A magnesium alloy workpiece is provided, a first region of the magnesium alloy workpiece is subjected to CNC high-light processing to form a high-light surface, and a first transparent protective layer is formed on the outside of the high-light surface by using a cutting fluid during the CNC high-light processing for high-brightness effect, the cutting fluid at least comprising alkyl sulfonate and a surfactant.

[0007] The magnesium alloy component processing method provided by the embodiments of the present application can form a first transparent protective layer while the magnesium alloy workpiece is subjected to high-light processing, and the cutting fluid can form a protective layer on the high-light surface after cutting is completed, thereby avoiding the high-light surface from being easily corroded and losing luster due to contact with oxygen and water, and avoiding the occurrence of new damage to the high-light surface due to polishing, so that a magnesium alloy component with better metal high-brightness quality is prepared.

[0008] In a possible design manner of the first aspect, the first transparent protective layer can be a nano protective film, which has good densification effect and can effectively isolate oxygen and water in the outside world to avoid the oxygen and water from contacting the high-light surface through the first transparent protective layer.

[0009] In a possible design of the first aspect, the cutting fluid further includes a first alkaline solvent, a complexing agent, and water, the first alkaline solvent is used to adjust the pH value of the cutting fluid, for example, the first alkaline solvent can be one or more of sodium silicate (Na2O nSiO2), sodium hydroxide (NaOH), and sodium carbonate (Na2CO3), and the pH value of the cutting fluid can be 8-12. The complexing agent is also called a complexing agent, for example, the complexing agent can be one or more of disodium ethylenediaminetetraacetate (EDTA-2Na), disodium citrate (C6H6Na2O7), and tartaric acid (C4H6O6). The complexing agent can form a stable complex with metal ions, thereby improving the adsorption effect of the cutting fluid on the high-gloss surface. At the same time, the complexing agent can prevent the high-gloss surface from being oxidized by oxygen, thereby isolating the high-gloss surface from oxygen.

[0010] In a possible design of the first aspect, the mass fraction of the surfactant is less than or equal to 5%, for example, the mass fraction of the surfactant in the cutting fluid can be 1%, 2%, 3%, 4%, 5%, or the like.

[0011] In a possible design of the first aspect, the mass fraction of the first alkaline solvent is less than or equal to 10%, for example, the mass fraction of the first alkaline solvent in the cutting fluid can be 2%, 4%, 6%, 8%, 10%, or the like.

[0012] In a possible design of the first aspect, the mass fraction of the complexing agent is less than or equal to 5%, for example, the mass fraction of the complexing agent in the cutting fluid can be 1%, 2%, 3%, 4%, 5%, or the like.

[0013] The surfactant, the alkyl sulfonate, the first alkaline solvent, and the complexing agent are added to water in a certain mass fraction to form the final cutting fluid. The cutting fluid provided in the embodiments of the present application not only has the functions of lubrication, cooling, and cleaning, but also has the effect of sedimentation plating film, and forms a first transparent protective layer to protect the high-gloss surface.

[0014] In a possible design of the first aspect, after the step of performing CNC high-gloss processing on the first region of the high-brightness effect magnesium alloy workpiece to form a high-gloss surface, the method further includes: providing a protective liquid to form a second transparent protective layer on the outside of the high-gloss surface, the protective liquid at least including silane. The formation of the second transparent protective layer can maintain the high-brightness effect of the high-gloss surface, prevent the high-gloss surface from being oxidized, and improve the adhesion between the film layer of the subsequent plating film and the magnesium alloy. That is, the second transparent protective layer can not only be effectively adsorbed on the surface of the high-gloss surface, but also form effective adsorption with other film layers formed on the outside thereof.

[0015] In a possible design of the first aspect, the protective liquid further includes a complexing agent, a second alkaline solvent, sodium citrate, an inhibitor, and water, the second alkaline solvent is used to adjust the pH value of the cutting fluid, for example, the second alkaline solvent can be one or more of sodium silicate, sodium hydroxide, and sodium carbonate, the pH value of the protective liquid can be 8-12, the sodium citrate in the protective liquid is used to remove the trace amount of oxides on the high-gloss surface, so as to ensure the metal luster of the surface of the reduced magnesium alloy workpiece. The inhibitor can also be referred to as an anti-corrosion agent, for example, the inhibitor can be sodium sulfide, zinc sulfate, sodium cyanide, potassium dichromate, etc., the main function of the inhibitor is to reduce the corrosion rate, so as to improve the corrosion resistance of the second transparent protective layer.

[0016] In a possible design of the first aspect, the mass fraction of the silane is greater than or equal to 2% and less than or equal to 10%.

[0017] In a possible design of the first aspect, the mass fraction of the second alkaline solvent can be less than or equal to 10%, the mass fraction of the sodium citrate can be less than or equal to 8%, the mass fraction of the complexing agent can be less than or equal to 5%, and the mass fraction of the inhibitor can be less than or equal to 2%. The silane, the complexing agent, the second alkaline solvent, the sodium citrate, and the inhibitor are added to water according to certain mass fractions to form the final protective liquid, so that the protective liquid provided in the embodiments of the present application can generate the second transparent protective layer to protect the high-gloss surface, improve the adhesion between the film layers, remove the trace amount of oxides on the high-gloss surface, and ensure the metal luster effect of the high-gloss surface.

[0018] In a possible design of the first aspect, the second transparent protective layer can also be a nano protective film, the nano protective film has good densification effect, can effectively isolate the oxygen and water in the outside world, and avoid the oxygen and water from contacting the high-gloss surface through the second transparent protective layer.

[0019] In a possible design of the first aspect, the step of providing the protective liquid to form the second transparent protective layer on the outside of the high-gloss surface specifically includes: performing a degreasing treatment on the first area to remove the grease on the surface of the first transparent protective layer; and immersing the first area in the protective liquid to form the second transparent protective layer on the outside of the high-gloss surface. Specifically, the grease on the surface of the first transparent protective layer can be removed by controlling a short degreasing time, and the first transparent protective layer is retained, so that the second transparent protective layer and the first transparent protective layer form double protection for the high-gloss surface.

[0020] In a possible design method of the first aspect, the step of providing a protective liquid to form a second transparent protective layer on the outside of the highlight surface specifically includes: degreasing the first area to remove the first transparent protective layer; providing a protective liquid to soak the first area to form a second transparent protective layer on the outside of the highlight surface. Specifically, the first transparent protective layer can be removed by controlling a longer degreasing time. At this time, the grease on the first transparent protective layer is naturally removed. The second transparent protective layer continues to protect the highlight surface after the first transparent protective layer is removed. Whether the first transparent protective layer is removed or not does not affect the highlight effect of the highlight surface.

[0021] In one possible design of the first aspect, after performing CNC high-gloss processing on the first area of ​​the magnesium alloy workpiece to form a high-gloss surface, the step further includes forming a transparent appearance layer on the outer side of the high-gloss surface. The transparent appearance layer can be formed on the outer side of the first transparent protective layer, providing dual transparent protection for the high-gloss surface with the first transparent layer and the transparent appearance layer. Alternatively, the transparent appearance layer can be formed on the outer side of the second transparent protective layer, providing triple transparent protection for the high-gloss surface with the first transparent protective layer, the second transparent protective layer, and the transparent appearance layer.

[0022] In a possible design method of the first aspect, the transparent appearance layer can be formed by transparent electrophoresis to maintain the continuous high brightness and high transmittance effect of the high-gloss surface. For example, a transparent cathode electrophoretic paint of a conventional acrylic resin system can be used, which is deposited on the outside of the high-gloss surface of the first area under the action of an electric field.

[0023] In a possible design method of the first aspect, the transparent appearance layer can also be formed by transparent spray paint to maintain the continuous high brightness and high transparency effect of the high-gloss surface. The transparent spray paint can be applied to the high-gloss surface by spraying or pouring, and then baked and solidified on the surface.

[0024] In one possible design of the first aspect, prior to performing CNC high-gloss treatment on the first region of the magnesium alloy workpiece, the step further includes chemically converting the surface of the magnesium alloy workpiece to form a chemical conversion layer. The purpose of the chemical conversion layer is to improve the corrosion resistance of the magnesium alloy workpiece and to enhance the performance of other subsequently attached film layers (including but not limited to the first transparent protective layer, the second transparent protective layer, and the transparent appearance layer). The chemical conversion is generally performed in a chemical environment such as a phosphate, chromate, phosphate-permanganate, stannate, or molybdate environment, thereby forming the corrosion-resistant chemical conversion layer.

[0025] In a possible design of the first aspect, after forming the chemical conversion layer, the method further includes forming a textured composite layer in the second region of the magnesium alloy workpiece.

[0026] The texture composite layer is formed on the chemical conversion layer, the texture composite layer can form texture color and light and shadow effect, such as shell texture, three-dimensional texture, diamond texture, etc., the first region and the second region are located at different positions on the magnesium alloy workpiece, so as to obtain a magnesium alloy assembly with texture dazzling and high-brightness metal luster, thereby improving the metal texture and aesthetic degree of the magnesium alloy assembly.

[0027] In a possible design manner of the first aspect, the texture composite layer includes at least one texture layer, and the texture composite layer with single texture effect, such as shell texture, three-dimensional texture, diamond texture, is formed.

[0028] In a possible design manner of the first aspect, the texture composite layer includes a first texture layer and a second texture layer, and at least one luster layer between the first texture layer and the second texture layer, the first texture layer can form light and shadow color, and the second texture layer can form frosted texture, so as to form texture visual and tactile double effects, and the luster layer mainly functions to realize metal luster effect and metal light and shadow effect.

[0029] In a possible design manner of the first aspect, forming the texture composite layer specifically includes: forming a primer layer on the chemical conversion layer in the second region; and forming a first texture layer on the primer layer. The primer layer mainly functions to improve adhesion of the first texture layer to the surface of the magnesium alloy workpiece and to shield the natural color of the magnesium alloy workpiece. The first texture layer can be used to realize light and shadow effect, and finally a magnesium alloy assembly with single texture effect formed by superposition of the primer layer and the first texture layer is obtained.

[0030] In a possible design manner of the first aspect, forming the texture composite layer specifically includes: forming a primer layer on the chemical conversion layer in the second region; forming a first texture layer on the primer layer; forming a first transition layer on the first texture layer; and forming a second texture layer on the first transition layer. The first transition layer functions to be upper and lower, and realizes close adhesion to the first texture layer and the second texture layer, and finally a second region of the magnesium alloy assembly formed by superposition of the primer layer, the first texture layer, the first transition layer and the second texture layer is obtained.

[0031] In a possible design manner of the first aspect, forming the texture composite layer specifically includes:

[0032] The primer layer is formed on the chemical conversion layer of the second region; the first texture layer is formed on the primer layer; the first gloss layer is formed on the first texture layer; the first transition layer is formed on the first gloss layer; and the second texture layer is formed on the first transition layer. The main function of the first gloss layer is to achieve the metal gloss effect and the metal light and shadow effect. After the first gloss layer is formed, the first transition layer is formed on the first gloss layer, so that the first transition layer transitions the first gloss layer and the second texture layer, and the adhesion effect of the second texture layer is improved. The forming process of the second texture layer can refer to the forming process of the first texture layer. In order to make the second texture layer and the first texture layer form different texture effects, the texture structures of the film sheet of the second texture layer and the film sheet of the first texture layer are different. For example, the film sheet of the first texture layer forms a light and shadow effect, and the film layer of the second texture layer forms a frosted texture effect. Finally, the second region of the magnesium alloy assembly presents a double-texture single-gloss film coating effect of the superposition of the primer layer, the first gloss layer, the first transition layer and the second texture layer.

[0033] In a possible design manner of the first aspect, the forming of the texture composite layer specifically includes: forming a primer layer on the chemical conversion layer of the second region; forming a first texture layer on the primer layer; forming a first gloss layer on the first texture layer; forming a first transition layer on the first gloss layer; forming a second gloss layer on the first transition layer; forming a second transition layer on the second gloss layer; and forming a second texture layer on the second transition layer. Finally, the second region of the magnesium alloy assembly presents a double-texture double-gloss film coating effect of the superposition of the primer layer, the first gloss layer, the first transition layer, the second gloss layer, the second transition layer and the second texture layer.

[0034] In a possible design manner of the first aspect, the magnesium alloy workpiece includes a back plate and a frame, the back plate has a first surface and a second surface opposite to each other in the thickness direction of the back plate, and the frame surrounds the back plate. The high light surface includes a first high light surface. The step of performing CNC high light processing on the first region of the magnesium alloy workpiece to form the high light surface includes: performing CNC cutting on the junction of the second surface and the frame to form a chamfer; and performing CNC high light processing on the chamfer to obtain the first high light surface. The cutting fluid used in the CNC high light processing forms a first transparent protective layer on the outer side of the first high light surface. In this way, a local high light can be formed at the position of the chamfer.

[0035] In one possible design of the first aspect, before the step of CNC-cutting the connection between the second surface and the frame to form a chamfer, the step of forming an opaque exterior layer on the surface of the frame is also included. In this way, after all film layers of the frame are formed, the connection between the frame and the back plate is then subjected to a highlighting treatment. In this way, when cutting to form the chamfer, not only can paint or glue overflow on the edge of the frame be removed, but the processing step of processing the first highlight surface is also placed at the end of the entire highlighting process, avoiding damage to the first highlight surface during other processing, which may affect the highlighting effect of the first highlight surface.

[0036] In a possible design manner of the first aspect, the highlight surface includes a first highlight surface and a second highlight surface, and the step of performing CNC highlight processing on the first area of ​​the magnesium alloy workpiece to form the highlight surface includes:

[0037] The chamfer is subjected to CNC highlight processing to obtain a first highlight surface, and the surface of the frame is subjected to CNC highlight processing to obtain a second highlight surface. The cutting fluid used in the CNC highlight processing forms a first transparent protective layer on the outside of the first highlight surface and the outside of the second highlight surface. In this way, local highlights can be formed at the positions of the chamfer and the frame.

[0038] In one possible design of the first aspect, the second region is the second surface of the backplate, and the step of forming the textured composite layer is performed before the step of CNC-finishing the first region of the magnesium alloy workpiece. In this way, when the backplate is chamfered, not only can paint or glue spillage on the edge of the second surface be removed, but the processing of the first and second high-gloss surfaces is also performed at the end of the entire high-gloss treatment method, thereby avoiding damage to the first and second high-gloss surfaces during the coating of the textured composite layer on the second surface of the backplate, which would affect the high-gloss effect of the first and second high-gloss surfaces.

[0039] In a second aspect, the present application provides a cutting fluid, which includes an alkyl sulfonate, a first alkaline solvent, a surfactant, a complexing agent and water.

[0040] In a possible design of the second aspect, the surfactant includes one or more of disodium citric acid, tartaric acid or ethylenediaminetetraacetic acid, the complexing agent includes one or more of sodium sulfide, zinc sulfate, sodium cyanide, and potassium dichromate, and the first alkaline solvent is sodium silicate.

[0041] In a possible design of the second aspect, the mass fraction of the first alkaline solvent is less than or equal to 10%, the mass fraction of the alkyl sulfonate is less than or equal to 5%, and the mass fraction of the complexing agent is less than or equal to 5%.

[0042] In a third aspect, the present application provides a protective solution, which includes a second alkaline solvent, sodium citrate, a complexing agent, an inhibitor, silane and water.

[0043] In a possible design of the third aspect, the complexing agent includes one or more of disodium citric acid, tartaric acid or ethylenediaminetetraacetic acid, the inhibitor includes one or more of sodium sulfide, zinc sulfate, sodium cyanide, and potassium dichromate, and the second alkaline solvent is sodium hydroxide.

[0044] In a possible design of the third aspect, the mass fraction of the second alkaline solvent is less than or equal to 10%, the mass fraction of sodium citrate is less than or equal to 8%, the mass fraction of the complexing agent is less than or equal to 5%, and the mass fraction of the inhibitor is less than or equal to 2%.

[0045] In a possible design of the third aspect, the mass fraction of silane is greater than or equal to 2% and less than or equal to 10%.

[0046] In a fourth aspect, the present application provides a magnesium alloy component, comprising a magnesium alloy workpiece and a first transparent protective layer arranged in a first area, the magnesium alloy workpiece having a first area, the first area having a high-gloss surface, and the components of the first transparent protective layer include at least alkyl sulfonate and surfactant.

[0047] In a possible design of the fourth aspect, the magnesium alloy component further includes a second transparent protective layer disposed outside the first transparent protective layer, and a component of the second transparent protective layer includes at least silane.

[0048] In a possible design of the fourth aspect, the first transparent protective layer is a nano protective film, and the second transparent protective layer is a nano protective film.

[0049] In a possible design of the fourth aspect, the magnesium alloy workpiece has a second region, and the magnesium alloy component further includes a chemical conversion layer and a texture composite layer sequentially stacked in the second region, and the texture composite layer includes at least a first texture layer.

[0050] In a possible design of the fourth aspect, the magnesium alloy component further includes a primer layer disposed between the chemical conversion layer and the first texture layer.

[0051] In a possible design of the fourth aspect, the magnesium alloy component further includes a first transition layer and a second texture layer sequentially stacked on the first texture layer.

[0052] In a possible design of the fourth aspect, the magnesium alloy component further includes a first glossy layer, a first transition layer, and a second texture layer sequentially stacked on the first texture layer.

[0053] In a possible design of the fourth aspect, the magnesium alloy assembly further includes a first gloss layer, a first transition layer, a second gloss layer, a second transition layer and a second texture layer which are sequentially stacked on the first texture layer.

[0054] In a possible design of the fourth aspect, the magnesium alloy workpiece includes a back plate and a frame, the back plate has a first surface and a second surface opposite to each other in a thickness direction of the back plate, the frame surrounds the back plate, the second surface forms a second region, a junction between the frame and the second surface forms a chamfer, and a surface of the chamfer forms a highlight surface.

[0055] In a possible design of the fourth aspect, the magnesium alloy workpiece includes a back plate and a frame, the back plate has a first surface and a second surface opposite to each other in a thickness direction of the back plate, the frame surrounds the back plate, the second surface forms a second region, a junction between the frame and the second surface forms a chamfer, and a surface of the frame forms a highlight surface.

[0056] In a possible design of the fourth aspect, the back plate has a first surface and a second surface opposite to each other in a thickness direction of the back plate, the frame surrounds the back plate, the second surface forms a second region, a junction between the frame and the second surface forms a chamfer, and a surface of the chamfer and the frame forms a highlight surface.

[0057] In the fifth aspect, the present application provides an electronic device, the electronic device includes a first shell, the first shell is prepared by using the processing method of the magnesium alloy assembly in any of the above embodiments.

[0058] In a possible design of the fifth aspect, the first shell includes the magnesium alloy assembly in any of the above embodiments.

[0059] In a possible design of the fifth aspect, the electronic device is a notebook computer.

[0060] In a possible design of the fifth aspect, the electronic device includes a display, the display includes a display screen and the first shell, and the first shell is used to protect the display screen. The first shell can be wrapped around an edge of the display screen and a back of the display screen.

[0061] In a possible design of the fifth aspect, the first shell includes a first back plate, a first frame and a second frame. The first back plate is located on a side of the display screen away from a display surface and is stacked with the display screen. The first frame is connected between the first back plate and the second frame, and the second frame is formed as a rectangular ring frame structure and surrounds an edge of the display screen. The first back plate, the first frame and the second frame enclose an internal mounting space of the display.

[0062] In a possible design of the fifth aspect, the first back plate constitutes the back plate of the magnesium alloy workpiece, the first frame constitutes the frame of the magnesium alloy workpiece, the first surface of the first back plate constitutes the first surface of the back plate, and the second door surface of the first back plate constitutes the second surface of the back plate.

[0063] In a possible design of the fifth aspect, the electronic device includes a host, the host includes a second shell, the second shell includes a second back plate, a panel and a third frame, the second back plate constitutes the back plate of the magnesium alloy workpiece, and the third frame constitutes the frame of the magnesium alloy workpiece.

[0064] In a possible design of the fifth aspect, the electronic device is a mobile phone, which includes a third shell, the third shell includes a third back panel and a fourth frame surrounding the third back panel, the third back panel constitutes the back panel of the magnesium alloy workpiece, and the fourth frame constitutes the frame of the magnesium alloy workpiece.

[0065] Among them, the technical effects brought about by any design method in the second to fifth aspects can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic diagram of the structure of an electronic device provided in some embodiments of the present application;

[0067] Figure 2 for Figure 1 A perspective view of a display of the electronic device shown in ;

[0068] Figure 3 For the Figure 2 Cross-sectional view along line AA;

[0069] Figure 4 For the Figure 1 Cross-sectional view along the midline BB;

[0070] Figure 5 A process flow chart of a magnesium alloy processing method provided in some embodiments of the present application;

[0071] Figure 6 A process flow chart of a method for processing magnesium alloy components provided in some embodiments of the present application;

[0072] Figure 7 A schematic structural diagram of a magnesium alloy workpiece provided in some embodiments of the present application;

[0073] Figure 8 A schematic structural diagram of a magnesium alloy component provided in some embodiments of the present application;

[0074] Figure 9 Schematic diagram of the structure of magnesium alloy components provided in other embodiments of the present application;

[0075] Figure 10 A diagram showing the process of forming a second transparent protective layer for the protective liquid;

[0076] Figure 11 A specific process flow chart for providing a protective liquid to form a second transparent protective layer on the outside of the high-gloss surface;

[0077] Figure 12 A schematic structural diagram of a magnesium alloy component provided in some embodiments of the present application;

[0078] Figure 13 Schematic diagram of the structure of magnesium alloy components provided in some embodiments of the present application;

[0079] Figure 14 A structural diagram showing the positional relationship between the chemical conversion layer and the highlight surface provided in some other embodiments of the present application;

[0080] Figure 15 This is a schematic structural diagram of a magnesium alloy workpiece provided in one embodiment of the present application;

[0081] Figure 16 for Figure 15 The schematic diagram of the stacked structure of the magnesium alloy workpiece forming a magnesium alloy component with a textured composite layer;

[0082] Figure 17 Schematic diagram of the stacked structure of the texture composite layer and the chemical conversion layer provided in some embodiments of the present application;

[0083] Figure 18 Schematic diagram of the stacked structure of the texture composite layer and the chemical conversion layer provided in other embodiments of the present application;

[0084] Figure 19 Schematic diagram of the stacked structure of the texture composite layer and the chemical conversion layer provided in some other embodiments of the present application;

[0085] Figure 20 Schematic diagram of the stacked structure of the textured composite layer and the chemical conversion layer in the second region provided in some other embodiments of the present application;

[0086] Figure 21a A schematic structural diagram of a first magnesium alloy component formed for a magnesium alloy workpiece having a back plate and a frame;

[0087] Figure 21b A schematic structural diagram of a second magnesium alloy component formed of a magnesium alloy workpiece having a back plate and a frame;

[0088] Figure 22 A schematic diagram of the structure of an electronic device provided in some other embodiments of the present application;

[0089] Figure 23 for Figure 21a A diagram of the local preparation process of the magnesium alloy component shown;

[0090] Figure 24 for Figure 21b A diagram of the local preparation process of the magnesium alloy component shown;

[0091] Figure 25 for Figure 21a The preparation process diagram of the magnesium alloy component shown;

[0092] Figure 26 for Figure 21b Diagram of the preparation process of magnesium alloy components shown.

[0093] Reference numerals:

[0094] 100. Electronic equipment;

[0095] 10. Display; 11. Display screen; 12. First housing; 121. First back panel; 1211. First surface; 1212. Second surface; 122. First frame; 123. Second frame;

[0096] 20. Host; 21. Host body; 211. Second housing; 211a. Second back panel; 211b. Panel; 211c. Third frame; 22. Keyboard; 30. Hinge assembly;

[0097] 40. Third housing; 41. Third back panel; 411. Camera; 42. Fourth frame;

[0098] 200, magnesium alloy workpiece; 200a, highlight surface; 210, first region; 220, second region; 210a, first highlight surface; 210b, second highlight surface; 230, back plate; 231, first surface; 232, second surface; 240, frame;

[0099] 310, chemical conversion layer; 320, first transparent protective layer; 330, second transparent protective layer; 340, transparent appearance layer; 350, opaque appearance layer; 360, texture composite layer; 361, primer layer; 362, first texture layer; 363, first gloss layer; 364, first transition layer; 365, second gloss layer; 366, second transition layer; 367, second texture layer;

[0100] 400, magnesium alloy components. DETAILED DESCRIPTION

[0101] In the embodiments of the present application, the term "exemplary" or "for example" is used to indicate an example, an illustration, or a description. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or having more advantages than other embodiments or design solutions. In fact, the term "exemplary" or "for example" is used in the sense of "by way of example", and is intended to present the relevant concept in a concrete manner.

[0102] In the embodiments of the present application, the terms "first", "second" are used only for descriptive purposes, and should not be interpreted or implied to indicate relative importance or implicitly indicate the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features.

[0103] In the description of the embodiments of the present application, the term "at least one" refers to one or more, and "multiple" refers to two or more. "At least one of the following (one)" or the like refers to any combination of these items, including any combination of single item (one) or multiple items. For example, at least one of a, b, or c can represent a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0104] In the description of the embodiments of the present application, the term "and / or" means and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in the present application generally represents that the front and rear associated objects are in an "or" relationship.

[0105] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" should be understood in a broad sense, for example, "connecting" can be detachable connection, or can be non-detachable connection; can be direct connection, or indirect connection through intermediate medium. Among them, "fixed connection" means that the relative positional relationship after connection is unchanged.

[0106] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connected", "connection" should be interpreted broadly, for example, "connection" can be removable connection, or can be non-removable connection; can be direct connection, or can be indirect connection through intermediate medium. The orientation language mentioned in the embodiments of the present application, such as "inner", "outer" and the like, is only the direction of the reference drawing, therefore, the orientation language used is for better and clearer illustration and understanding of the embodiments of the present application, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0107] In the description of the embodiments of the present application, the terms "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or device including the element. Without more limitation, the element defined by the sentence "including a…" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0108] For the convenience of understanding, some explanations of terms related to the preparation process of the present application are listed here:

[0109] Micro-arc oxidation (MAO):

[0110] Micro-arc oxidation is also known as plasma electrolytic oxidation. Micro-arc oxidation can generate an oxide coating layer on a conductive material such as a metallic material. "Metallic material" means pure metal, metal alloy, intermetallic or metal-containing composite, etc. The metallic material can include aluminum, magnesium, titanium, etc. MAO uses high electromotive force so that discharge can occur and the resulting plasma can modify the structure of the oxide layer.

[0111] Chemical conversion:

[0112] Chemical conversion occurs when surface atoms of metals (including plated metals) react with anions in a dielectric medium, forming a highly adhesive barrier layer on the metal surface. This compound barrier layer is called a chemical conversion coating. As a protective layer for metal products, chemical conversion coatings primarily transform chemically active metal elements into chemically inactive metal compounds, such as oxides, chromates, and phosphates, thereby improving the thermodynamic stability of the metal in the environment. There are many types of chemical conversion, including chromating, phosphate treatment, non-chromium treatment, metal coloring, and chemical grinding. Chemical conversion offers excellent corrosion resistance, adsorption, electrical insulation, and resistance to molten metal adhesion. It is commonly used in chemical treatments of steel, aluminum, zinc, stainless steel, copper, and magnesium.

[0113] Highlight processing of computer numerical control (CNC) milling machine:

[0114] CNC high-gloss machining involves entering NC program instructions into the CNC system's memory, performing computer-compiled calculations, and then transmitting this information to the driver via a displacement control system, driving the motor to cut the designed part. Generally, any machine tool controlled by a computer is referred to as CNC. For example, diamond tooling utilizes sharp, natural diamond cutting tools to produce a lustrous, high-precision turning finish on soft metals such as aluminum and copper alloys.

[0115] The present application provides an electronic device, which includes but is not limited to a mobile phone, a laptop computer, a tablet personal computer, an e-book, a learning machine, a wearable device (for example, a smart watch, a smart bracelet, smart glasses, a smart helmet), a virtual reality (VR) electronic device, an augmented reality (AR) electronic device, a smart home, etc.

[0116] See also Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 100 provided in some embodiments of the present application. In the embodiments of the present application, the electronic device 100 is described as a laptop computer, but this should not be construed as limiting the present application. Specifically, the electronic device 100 includes a display 10, a host 20, and a hinge assembly 30.

[0117] The display 10 includes a display screen 11 and a first shell 12. The display screen 11 is used to display images, videos, etc. The display screen 11 can be a flexible display screen or a rigid display screen. For example, the display screen 11 can be an organic light-emitting diode (OLED) display screen, an active-matrix organic light-emitting diode (AMOLED) display screen, a mini organic light-emitting diode (MLED) display screen, a microorganic light-emitting diode (MLED) display screen, a micro organic light-emitting diode (MLED) display screen, a quantum dot light emitting diode (QLED) display screen, or a liquid crystal display (LCD). The first shell 12 is used to protect the display screen 11. The first shell 12 can cover the edge of the display screen 11 and the back of the display screen 11.

[0118] The host 20 includes a main body 21 and a keyboard 22. The main body 21 includes a second housing 211 and electronic components (not shown) housed within the second housing 211, including, but not limited to, a processor and memory. The main body 21 controls the display 10 to display images and videos based on commands or data input via the keyboard 22.

[0119] The hinge assembly 30 is used to rotatably connect the display 10 and the host 20 so that the electronic device 100 can switch between an open state and a closed state. In some embodiments, the hinge assembly 30 is connected between the first housing 12 and the second housing 211.

[0120] See also Figure 1 When the electronic device 100 is in the open state, the display 10 and the host 20 form an angle greater than 0° and less than 360°. In some embodiments, the hinge assembly 30 has a damping effect so that the electronic device 100 can maintain a target opening angle position between 0° and 360°. The target opening angle can be a fixed value between 0° and 360°, or it can be any value between 0° and 360°. When the electronic device 100 is in the open state, the user can control the display of the display 11 through the host 20, and the user can also view the image or video displayed on the display 11.

[0121] See also Figure 2 , Figure 2 for Figure 1 The figure shows a perspective view of the display 10 in the electronic device 100. When the electronic device 100 is in the closed state, the display 10 covers the host 20, and the display surface of the display 10 faces the keyboard 22 of the host 20, thereby protecting the display interface of the display 10 and the keyboard 22 of the host 20 from scratches and dust. In addition, the first housing 12, which forms the appearance of the electronic device 100, faces the user.

[0122] To facilitate the description of the following embodiments, an XYZ coordinate system is established for the display 10. Specifically, the direction extending from the axis of rotation of the host 20 and the display 10 is defined as the X-axis direction, the thickness direction of the display 10 (i.e., the thickness direction of the first housing 12) is defined as the Z-axis direction, and the direction perpendicular to both the X-axis and the Z-axis is defined as the Y-axis direction. It will be appreciated that the coordinate system of the display 10 can be flexibly configured according to actual needs and is not specifically limited here.

[0123] See also Figure 3 , Figure 3 For the Figure 2 In the cross-sectional view taken along line AA, the first housing 12 includes a first back panel 121, a first frame 122, and a second frame 123. The first back panel 121 is located on the side of the display screen 11 facing away from the display surface and is stacked with the display screen 11. The first frame 122 is connected between the first back panel 121 and the second frame 123. The second frame 123 is formed into a rectangular ring-shaped frame structure and surrounds the edge of the display screen 11. The first back panel 121, the first frame 122, and the second frame 123 enclose the internal installation space of the display 10.

[0124] Please continue reading Figure 3 Specifically, the first back panel 121 has a first surface 1211 and a second surface 1212 in the Z direction. The first surface 1211 faces the display screen 11, and the second surface 1212 faces away from the display screen 11. The first frame 122 is surrounded by the first back panel 121 and connected to the second frame 123. One end of the first frame 122 is connected to the first back panel 121 and the first frame 122 is located as a whole on the side of the first back panel 121 facing away from the second surface 1212, so that the first frame 122 does not extend beyond the second surface 1212. When the electronic device 100 is in the closed state, if the user places the electronic device 100 flat on the desktop, the user can observe the second surface 1212 of the first back panel 121 from directly above the electronic device 100 and observe the first frame 122 from the side of the desktop. At this time, the second frame 123 is directly opposite the keyboard 22.

[0125] In some embodiments, see Figure 4 , Figure 4 For the Figure 1 In the cross-sectional view along the middle BB line, the second housing 211 includes a second back plate 211a, a panel 211b, and a third frame 211c. The third frame 211c is connected between the second back plate 211a and the panel 211b. The panel 211b is located on the side where the keyboard 22 is located and is arranged around the periphery of the keyboard 22. In some embodiments, please combine Figure 1 and Figure 4 The panel 211b of the main body 21 is provided with a touchpad area 211d, through which a user can operate a mouse. The second back panel 211a faces away from the keyboard 22 and is disposed opposite the panel 211b. In some embodiments, the second back panel 211a can serve as a support surface for the electronic device 100. If the user places the electronic device 100 flat on a table, the second back panel 211a will conform to the table surface.

[0126] In some embodiments, at least one of the first shell 12 and the second shell 211 is made of aluminum alloy material, which has high strength and good wear resistance, and can effectively support and protect the display screen 11 and keyboard 22, while ensuring the continuous use capability of the display 10 of the electronic device 100 for long-term opening and closing.

[0127] To further reduce the weight and thickness of the electronic device 100, in other embodiments, a magnesium alloy with a lower density can be used instead of an aluminum alloy to form the first housing 12 or the second housing 211. The density of the magnesium alloy is one-third of that of the aluminum alloy. This ensures that the electronic device 100 is both lighter and thinner while maintaining its structural strength. Magnesium alloys are chemically active and are easily corroded in environments exposed to oxygen and water. Therefore, while reducing the weight and thickness of the electronic device 100, the process of preparing the magnesium alloy to form the first housing 12 or the second housing 211 presents new challenges.

[0128] See also Figure 5 , Figure 5 The process flow chart of the magnesium alloy processing method provided in some embodiments of the present application is as follows: Figure 5 The processing method of the embodiment can prepare a magnesium alloy workpiece into a magnesium alloy component with a local high-gloss metallic luster. The magnesium alloy component can be used in the electronic device 100. For example, the magnesium alloy component can form the first housing 12 or the second housing 211 of the electronic device 100. Specifically, the processing method includes:

[0129] S1. Provide an original magnesium alloy workpiece and perform grinding pretreatment on it;

[0130] S2. chemically converting or micro-arc oxidizing the polished magnesium alloy workpiece to form a protective film;

[0131] S3. spraying paint on the surface of the magnesium alloy workpiece after micro-arc oxidation or chemical formation treatment to form a paint layer;

[0132] S4. Perform highlight cutting on the designated area of ​​the magnesium alloy workpiece by CNC to form a highlight surface;

[0133] S5. Polish the high-gloss surface.

[0134] exist Figure 5 In the illustrated embodiment, step S1 can be used to polish uneven areas of the magnesium alloy workpiece using sandpaper or a grinder. In step S2, a protective film is formed on the surface of the magnesium alloy object through micro-arc oxidation or chemical conversion, enhancing the corrosion resistance of the magnesium alloy workpiece. Then, in step S3, the surface is spray-painted to enhance the appearance and protect the magnesium alloy workpiece. Thereafter, according to different personalized requirements, CNC high-gloss treatment is performed at designated locations on the magnesium alloy workpiece to remove the paint layer and protective film, exposing the metal body and presenting the high-gloss surface of the magnesium alloy.

[0135] Since magnesium alloys have a relatively active chemical property, after being CNC-highlighted, magnesium alloy workpieces will quickly oxidize and generate fog when in contact with air, losing the high-gloss effect. Therefore, it is necessary to polish the oxidized high-gloss surface through step S4. Specifically, the high-gloss surface can be polished by a polishing wheel to improve the brightness of the high-gloss surface after polishing. However, due to the limitations of the polishing process, although the polishing process can improve the brightness of the high-gloss surface, it will also cause new damage to the atomized high-gloss surface, such as forming some new grinding marks, which makes it impossible for the high-gloss surface to restore the original metal high-gloss luster, and the yield rate is low.

[0136] In order to solve the problem that the highlight surface of magnesium alloy is easily corroded during preparation, resulting in a low yield of magnesium alloy components, an embodiment of the present application provides a processing method for magnesium alloy components. In the processing method of the embodiment of the present application, a protective layer (i.e., the first transparent protective layer below) can be generated on the highlight surface while performing CNC highlight cutting on the magnesium alloy, thereby isolating oxygen and air, solving the problem of rapid oxidation and fogging of magnesium alloy after CNC highlighting, and eliminating subsequent polishing processes.

[0137] See also Figure 6 , Figure 6 This is a process flow chart of a method for processing magnesium alloy components provided in some embodiments of the present application. The preparation method includes the following steps:

[0138] S100, providing a magnesium alloy workpiece;

[0139] S102. Perform CNC highlight processing on the first area of ​​the magnesium alloy workpiece to form a highlight surface. The cutting fluid used in the CNC highlight processing to form a first transparent protective layer on the outside of the highlight surface. The cutting fluid includes at least alkyl sulfonate (SAS for short, with the general formula of RSO3Me) and a surfactant.

[0140] See also Figure 7 , Figure 7 This is a schematic structural diagram of a magnesium alloy workpiece 200 provided in some embodiments of the present application. The magnesium alloy workpiece 200 has a first region 210. The first region 210 refers to a location on the surface of the magnesium alloy workpiece 200 that requires special highlighting. A highlight logo can be formed in the first region 210, or a local highlight surface can be formed in the first region 210 to achieve a unique metallic highlight and gloss in the first region 210, thereby improving the aesthetics of the magnesium alloy workpiece 200. It is understood that the first region 210 can refer to a single surface on the magnesium alloy workpiece 200, multiple adjacent surfaces, or multiple non-adjacent surfaces, and the specific location of the first region 210 is not limited in this application.

[0141] See also Figure 8 , Figure 8 The structural diagram of the magnesium alloy component 400 provided in some embodiments of the present application is shown. The magnesium alloy workpiece 200 is processed in step S102 to form a magnesium alloy component 400 having a first transparent protective layer 320. The magnesium alloy component 400 can form the appearance shell of any electronic device 100, as described above. Figure 3 The first housing 12 in the embodiment, or Figure 4 The second shell 211 in the embodiment, etc.

[0142] Please refer to Figures 7 and 8 Through CNC highlight processing, a highlight surface 200a is formed on the first area 210. During the CNC highlight processing, cutting fluid is required at the cutting position of the cutting tool of the CNC equipment. The cutting fluid is used to cool, lubricate the cutting tool, and clean the cutting position. The lubricating effect of the cutting fluid during the cutting process can reduce the friction between the cutting tool and the chips, and between the cutting tool and the magnesium alloy workpiece 200, thereby reducing friction and power loss. The cleaning effect of the cutting fluid during the cutting process is used to remove the generated chips, grinding chips, and powder, so that the cutting tool remains sharp and does not affect the cutting effect. The cooling effect of the cutting fluid during the cutting process is used to remove the heat generated by the cutting tool at any time to prevent the cutting tool from overheating.

[0143] And, the cutting fluid in the embodiment of the present application can not only play the function of the traditional cutting fluid, but also provide a protective effect on the high-gloss surface 200a. The cutting fluid is sprayed in real time during cutting, and the cutting fluid can quickly form a first transparent protective layer 320 on the outside of the high-gloss surface 200a. After the CNC high-gloss processing is completed, the first transparent protective layer 320 on the high-gloss surface 200a is generated, that is, the high-gloss surface 200a and the first transparent protective layer 320 are formed at the same time or in an acceptable extremely short time. The first transparent protective layer 320 is dense and transparent, effectively isolates water and oxygen, avoids the oxidation and fogging of the high-gloss surface 200a after cutting is completed, and ensures that the metal luster of the high-gloss surface 200a is transmitted.

[0144] Specifically, the cutting fluid at least includes alkyl sulfonate and a surfactant. In the actual film forming process, the surfactant can reduce the surface tension of the cutting fluid and increase the wettability of the cutting fluid, so that the cutting fluid can quickly wet and lay flat on the surface of the magnesium alloy workpiece 200 and form a film. After the alkyl sulfonate is laid flat by the surfactant, it is quickly adsorbed on the surface of the magnesium alloy workpiece 200, thereby forming a first transparent protective layer 320 on the outside of the high-gloss surface 200a to protect the high-gloss surface 200a.

[0145] Further, the magnesium alloy belongs to a polar metal. When the cutting fluid contacts the surface of the magnesium alloy workpiece 200, hydrogen bond forces are generated between the polar molecules in the magnesium alloy and the polar atoms or molecules in the alkyl sulfonate, thereby depositing the cutting fluid on the high-gloss surface 200a to form a first transparent protective layer 320 with good adhesion and a protective effect.

[0146] Therefore, the processing method of the magnesium alloy assembly 400 provided in the embodiment of the present application can form a first transparent protective layer 320 while performing high-gloss processing on the magnesium alloy workpiece 200, and can form a protective layer for the high-gloss surface 200a while cutting is completed, thereby avoiding the corrosion of the high-gloss surface 200a caused by contact with oxygen and water and the loss of luster, and avoiding the need for additional polishing of the high-gloss surface 200a, thereby avoiding the generation of new damage to the high-gloss surface 200a caused by polishing, and thereby preparing a magnesium alloy assembly 400 with better metal high-gloss quality.

[0147] The magnesium alloy assembly 400 in the above embodiment can be prepared by other methods in addition to the processing method described above, as long as the first transparent protective layer 320 with alkyl sulfonate and surfactant is formed on the high-gloss surface 200a. It can be understood that the magnesium alloy assembly 400 in any of the following embodiments can also be prepared by the processing method or other method of the magnesium alloy assembly 400 in the embodiment of the present application.

[0148] In some embodiments, the first transparent protective layer 320 can be a nano protective film. The nano protective film has good densification effect and can effectively isolate oxygen and water in the outside world to avoid the contact of oxygen and water with the high gloss surface 200a through the first transparent protective layer 320.

[0149] In some embodiments, the surfactant can be anionic, nonionic or cationic. For example, the anionic surfactant can be fatty acid soap (such as potassium fatty acid soap), petroleum sulfonate (C 23 H 38 SO3M or C 31 H 48 SO3M) and the like, the nonionic surfactant can be sorbitol ester (C6H 14 O6), polyether and the like, and the cationic surfactant can be fatty acid alkyl amide (RCON(CH2CH2OH)2) and the like.

[0150] In some embodiments, the cutting fluid further includes a first alkaline solvent, a complexing agent and water. The first alkaline solvent is used to adjust the pH value of the cutting fluid. For example, the first alkaline solvent can be one or more of sodium silicate (Na2O·nSiO2), sodium hydroxide (NaOH) and sodium carbonate (Na2CO3). The first alkaline solvent can adjust the pH value of the cutting fluid. For example, the pH value of the cutting fluid can be 8-12. When the first alkaline solvent is sodium silicate, the sodium silicate can also act as a corrosion inhibitor to improve the corrosion resistance of the first transparent protective layer.

[0151] The complexing agent is also called a complexing agent. For example, the complexing agent can be one or more of disodium ethylenediaminetetraacetate (EDTA-2Na), disodium citrate (C6H6Na2O7) and tartaric acid (C4H6O6). The complexing agent can form a stable complex with metal ions to improve the adsorption effect of the cutting fluid on the high gloss surface 200a. At the same time, the complexing agent can prevent the high gloss surface 200a from being oxidized by oxygen, thereby isolating the high gloss surface 200a and oxygen.

[0152] The surfactant, alkyl sulfonate, first alkaline solvent and complexing agent are added to water in a certain mass fraction to form the final cutting fluid. The cutting fluid provided by the present application not only has the functions of lubrication, cooling and cleaning, but also has the function of depositing the film to form the first transparent protective layer 320 to protect the high gloss surface 200a.

[0153] The thickness of the first transparent protective layer 320 can be designed according to actual conditions. In some embodiments, the thickness of the first transparent protective layer 320 is 50 nanometers (nm) to 800 nm. For example, the thickness of the first transparent protective layer 320 can be 50 nm, 100 nm, 200 nm, 300 nm, 400 nm, 500 nm, 600 nm, 700 nm, 800 nm, etc.

[0154] Specifically, the mass fraction refers to the ratio of the mass of the solute to the mass of the solvent in the solvent, and also refers to the percentage of the mass of a certain substance in the total mass in the mixture. For example, when the total mass of the cutting fluid is a and the mass of the alkyl sulfonate is b, then b / a is the mass fraction of the alkyl sulfonate. For example, the mass fraction of the alkyl sulfonate can be less than or equal to 5%, for example, the mass fraction of the alkyl sulfonate in the cutting fluid can be 1%, 2%, 3%, 4%, 5%, etc.

[0155] Similarly, the mass fraction of the surfactant, the reference fraction of the first alkaline solvent, and the mass fraction of the complexing agent are understood with reference to the mass fraction of the alkyl sulfonate, which will not be repeated here. The mass fraction of the surfactant can be less than or equal to 5%, for example, the mass fraction of the surfactant in the cutting fluid can be 1%, 2%, 3%, 4%, 5%, etc. The mass fraction of the first alkaline solvent can be less than or equal to 10%, for example, the mass fraction of the first alkaline solvent in the cutting fluid can be 2%, 4%, 6%, 8%, 10%, etc. The mass fraction of the complexing agent can be less than or equal to 5%, for example, the mass fraction of the complexing agent in the cutting fluid can be 1%, 2%, 3%, 4%, 5%, etc.

[0156] In some embodiments, after the step S102 of performing CNC high light processing on the first area 210 of the highlight effect magnesium alloy workpiece 200 to form the high light surface 200a, the step S102 further includes:

[0157] S103, providing a protective liquid to form a second transparent protective layer 330 on the outside of the high light surface 200a, the protective liquid at least including silane.

[0158] Please refer to Figure 9 , Figure 9 The structure schematic diagram of the magnesium alloy assembly 400 provided by another embodiment of the present application is shown. Through the action of the protective liquid, the second transparent protective layer 330 is further superimposed on the outside of the high light surface 200a. The second transparent protective layer 330 can maintain the highlight effect of the high light surface 200a, prevent the high light surface 200a from being oxidized, and improve the adhesion between the film layer of subsequent plating and the magnesium alloy workpiece 200. That is, the second transparent protective layer 330 can not only be effectively adsorbed on the surface of the high light surface 200a, but also can form effective adsorption with other film layers formed on the outside thereof.

[0159] Specifically, silane, also known as silane agent, is a general term for compounds of silicon and hydrogen, including but not limited to monosilane (SiH4), disilane (Si2H6), etc. Silane can form a dense protective film, i.e., the second transparent protective layer 330, effectively isolating oxygen and water, thereby improving the corrosion resistance of the magnesium alloy, and the adhesion between the film layers on the high-gloss surface 200a of the magnesium alloy assembly 400 obtained after silane treatment can also be significantly improved.

[0160] In some embodiments, the protective liquid further comprises a complexing agent, a second alkaline solvent, sodium citrate, an inhibitor, and water. The second alkaline solvent is used to adjust the pH value of the cutting fluid. Exemplarily, the second alkaline solvent can be one or more of sodium silicate, sodium hydroxide, and sodium carbonate. The pH value of the protective liquid can be 8-12. The complexing agent in the protective liquid can be the same as or different from the type of complexing agent in the cutting fluid, and the complexing agent has the same effect in the protective liquid as in the cutting fluid. For details, please refer to the above explanation of the complexing agent in the cutting fluid, which will not be repeated here.

[0161] In Figure 8 In the magnesium alloy assembly 400 provided in the embodiment shown, the high-gloss surface 200a is formed at the same time as a first transparent protective layer 320 is formed on its surface. However, if there are some extreme cases that cause the first transparent protective layer 320 not to completely cover the high-gloss surface 200a, there will be a case that the high-gloss surface 200a is partially oxidized to form oxides. Therefore, in the process of forming the second transparent protective layer 330, the sodium citrate in the protective liquid provided in step S103 can remove the trace oxides present on the surface of the high-gloss surface 200a, thereby restoring the metal luster of the surface of the magnesium alloy workpiece 200. The inhibitor can also be called a corrosion inhibitor. Exemplarily, the inhibitor can be sodium sulfide, zinc sulfate, sodium cyanide, potassium dichromate, etc. The main function of the inhibitor is to reduce the corrosion rate, thereby improving the corrosion resistance of the second transparent protective layer 330.

[0162] The silane, complexing agent, second alkaline solvent, sodium citrate, and inhibitor are added to water in a certain mass fraction to form the final protective liquid. The protective liquid provided in the embodiments of the present application can generate the second transparent protective layer 330 to protect the high-gloss surface 200a while improving the adhesion between the film layers and removing the trace oxides on the surface of the high-gloss surface 200a, thereby ensuring the metal luster effect of the high-gloss surface 200a. The thickness of the second transparent protective layer 330 can be designed according to actual conditions. Exemplarily, the thickness of the first transparent protective layer 320 is 0.5 microns (μm)-3 μm.

[0163] In some embodiments, the mass fraction of silane can be greater than or equal to 2% and less than or equal to 10%, for example, the mass fraction of silane in the protective solution can be 2%, 4%, 6%, 8%, 10%, etc. The mass fraction of the second alkaline solvent can be less than or equal to 10%, for example, the mass fraction of the second alkaline solvent in the protective solution can be 2%, 4%, 6%, 8%, 10%, etc. The mass fraction of sodium citrate can be less than or equal to 8%, for example, the mass fraction of sodium citrate in the protective solution can be 2%, 4%, 6%, 8%, etc. The mass fraction of the complexing agent can be less than or equal to 5%, for example, the mass fraction of the complexing agent in the protective solution can be 1%, 2%, 3%, 4%, 5%, etc. The mass fraction of the inhibitor can be less than or equal to 2%, for example, the mass fraction of the inhibitor in the protective solution can be 1%, 2%, 3%, 4%, 5%, etc.

[0164] In some embodiments, the second transparent protective layer 330 can also be a nano protective film. The nano protective film has good densification effect and can effectively isolate oxygen and water in the external environment, so as to avoid the contact of oxygen and water with the high light surface 200a through the second transparent protective layer 330.

[0165] Referring to Figure 10 , Figure 10 The processing process diagram for forming the second transparent protective layer 330 of the protective solution is as follows:

[0166] Step 1, degreasing. Specifically, the degreasing environment can be 40-60°C, and the degreasing time can be 30-90s. The purpose is to remove the dirt such as oil stains and fingerprints generated on the surface of the magnesium alloy assembly 400 after step S102, so as to ensure the high brightness and luster of the high light surface 200a.

[0167] Step 2, water washing. Specifically, the magnesium alloy assembly 400 after degreasing can be washed with clean water for at least twice.

[0168] Step 3, soaking in the protective solution. Specifically, the magnesium alloy assembly 400 after water washing can be soaked in the protective solution, the soaking environment can be 50-60°C, and the soaking time can be 60-120s. During the soaking process, the protective solution is attached to the outside of the high light surface 200a to form the second transparent protective layer 330.

[0169] Step 4, water washing and drying. Specifically, after the second transparent protective layer 330 is formed, the magnesium alloy workpiece 200 is washed with clean water for at least twice, and then is baked to dehydrate and solidify, so as to form the magnesium alloy assembly 400 containing the second transparent protective layer 330.

[0170] In some embodiments, referring to Figure 11 , Figure 11To provide a protective liquid to form the second transparent protective layer 330 on the outer side of the highlight surface 200a, the specific process flow chart of step S103 specifically includes:

[0171] S1031, performing a degreasing treatment on the first area 210 to remove grease on the surface of the first transparent protective layer 320 and / or remove the first transparent protective layer 320.

[0172] S1032, providing a protective liquid to soak the first area 210 to form the second transparent protective layer 330 on the outer side of the highlight surface 200a.

[0173] Specifically, the degreasing environment for performing the degreasing treatment on the first area 210 can be 40-60°C, and the purpose is to remove dirt such as oil stains and fingerprints generated on the surface of the magnesium alloy workpiece 200 after step S102. In some embodiments, by controlling a relatively short degreasing time, the grease on the surface of the first transparent protective layer 320 can be removed, and the first transparent protective layer 320 is retained. In this way, in subsequent step S1032, the second transparent protective layer 330 is formed on the first transparent protective layer 320. In other embodiments, by controlling a relatively long degreasing time, the first transparent protective layer 320 can be removed, and the grease on the first transparent protective layer 320 is naturally removed. In this way, in subsequent step S1032, the second transparent protective layer 330 is directly formed on the highlight surface 200a.

[0174] It can be understood that the removal of the first transparent protective layer 320 is performed during the generation of the second transparent protective layer 330. Therefore, after the removal of the first transparent protective layer 320, the highlight surface 200a will not be in contact with external oxygen and water, and the protection will continue through the second transparent protective layer 330.

[0175] The formation of the second transparent protective layer 330 can form a double protection on the highlight surface 200a with the first transparent protective layer 320, or continue to protect the highlight surface 200a after the removal of the first transparent protective layer 320. Whether the first transparent protective layer 320 is removed or not does not affect the high-brightness effect of the highlight surface 200a. Hereinafter, for the sake of convenience, the description is made according to the case where the first transparent protective layer 320 is not removed, but this cannot be understood as a limitation of the present application.

[0176] In some embodiments, please refer to Figure 12 , Figure 12 For the structure schematic diagram of the magnesium alloy assembly 400 provided by some embodiments of the present application, after step S102 of performing the CNC highlight treatment on the first area 210 of the magnesium alloy workpiece 200 to form the highlight surface 200a, the step further includes:

[0177] S104, forming a transparent appearance layer 340 on the outer side of the highlight surface 200a.

[0178] The transparent appearance layer 340 is directly formed on the outside of the first transparent protective layer 320, that is, after step S102, step S104 is directly performed, and the high-gloss surface 200a is double transparently protected by the first transparent layer and the transparent appearance layer 340. Please refer to Figure 13 , Figure 13 For another embodiment of the present application, a structural schematic diagram of the magnesium alloy component 400 is provided, the transparent appearance layer 340 is formed on the outside of the second transparent protective layer 330, that is, after step S102, step S103 is performed, and then step S104 is performed after step S103, and the high-gloss surface 200a is three-layer transparently protected by the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340.

[0179] In some embodiments, the transparent appearance layer 340 can be formed by a transparent electrophoresis method to maintain the sustained high brightness and high transparency of the high-gloss surface 200a. For example, a conventional acrylic resin system transparent cathode electrophoretic paint can be used, and under the action of an electric field, the transparent appearance layer 340 is deposited on the outside of the high-gloss surface 200a in a deposition environment of 80-100°C for 10-15 min, and then the transparent appearance layer 340 is baked at 150-170°C for 20-30 min to complete the curing and film formation of the transparent appearance layer 340. The thickness of the transparent appearance layer 340 formed by the transparent electrophoresis method can be 8-15 μm. For example, the thickness of the transparent appearance layer 340 can be 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, etc.

[0180] In another embodiment, the transparent appearance layer 340 can also be formed by a transparent spray paint method to maintain the sustained high brightness and high transparency of the high-gloss surface 200a. The transparent spray paint can be applied by a spraying or showering method, the transparent paint is coated on the surface of the high-gloss surface 200a, and is baked and cured on the surface. For example, the thickness of the transparent appearance layer 340 formed by the transparent spray paint can be 8-20 μm. For example, the thickness of the transparent appearance layer 340 can be 8 μm, 9 μm, 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, 15 μm, 16 μm, 17 μm, 18 μm, 19 μm, 20 μm, etc.

[0181] In another embodiment, the transparent protective layer can also be formed by other methods, and the specific method is not limited herein. The transparent appearance layer 340 is provided to achieve multiple protection of the high-gloss surface 200a.

[0182] In some embodiments, please refer to Figure 14 , Figure 14A structural diagram of the positional relationship between the chemical conversion layer 310 and the high-gloss surface 200a is provided for some embodiments of the present application. Before the first area 210 of the magnesium alloy workpiece 200 is subjected to CNC high-gloss processing in step S102, the surface of the magnesium alloy workpiece 200 is subjected to chemical conversion to form a chemical conversion layer 310 in step S101.

[0183] The purpose of the chemical conversion layer 310 is to improve the corrosion resistance of the magnesium alloy workpiece 200 and to improve the subsequent adhesion of other film layers (including but not limited to the first transparent protective layer 320, the second transparent protective layer 330, and the transparent appearance layer 340). The chemical environment of the chemical conversion is generally phosphate, chromate, phosphate-permanganate, stannate, molybdate, etc., so as to form a corrosion-resistant chemical conversion layer 310 through chemical conversion.

[0184] The magnesium alloy assembly 400 is covered by the chemical conversion layer 310 except for the area where the high-gloss surface 200a is formed, and is subjected to local high-gloss processing in step 102. At this time, the chemical conversion layer 310 on the surface of the high-gloss surface 200a is removed in the CNC process, and the chemical conversion layer 310 on the other areas except for the surface of the high-gloss surface 200a remains on the magnesium alloy workpiece 200 to continue protection.

[0185] In summary, the magnesium alloy workpiece 200 provided in step S100 of the present application, the magnesium alloy assembly 400 formed through steps S101-S102-S103-S104, and the high-gloss surface 200a formed in the first area 210 superimposed with the first transparent protective layer 320, the second transparent protective layer 330, and the transparent appearance layer 340 (or superimposed with the first transparent protective layer 320 and the transparent appearance layer 340). In other positions (such as the second area 220 described below) outside the first area 210, effective protection can be provided by the chemical conversion layer 310. In some embodiments, the thickness of the chemical conversion layer 310 can be 0.5 μm-3 μm. For example, the thickness of the chemical conversion layer 310 can be 0.5 μm, 1 μm, 1.5 μm, 1 μm, 1 μm, 3 μm, etc.

[0186] In some embodiments, reference is made to Figure 15 and Figure 16 , Figure 15 A structural diagram of the magnesium alloy workpiece 200 provided in an embodiment of the present application is shown in Figure 16 A structural diagram of the magnesium alloy workpiece 200 provided in an embodiment of the present application is shown in Figure 15 A structural diagram of the magnesium alloy assembly 400 formed by the magnesium alloy workpiece 200 shown in the figure is shown in

[0187] S105, forming a texture composite layer 360 on the second area 220 of the magnesium alloy workpiece 200.

[0188] Referring to Figure 15 , the magnesium alloy workpiece 200 has a first region 210 and a second region 220, the first region 210 and the second region 220 are located at different positions of the magnesium alloy workpiece 200, and the magnesium alloy workpiece 200 forms a magnesium alloy assembly 400, which can constitute a first shell 12 as shown in Figure 3 , at this time, the first region 210 can be located at a second surface 1212 of the first shell 12, and the second region 220 is located at an outer surface of a first frame 122 of the first shell 12.

[0189] The texture composite layer 360 can be formed on the chemical conversion layer 310, and the texture composite layer 360 can form texture color and light and shadow effects such as shell texture, three-dimensional texture, diamond texture, etc. The first region 210 and the second region 220 are located at different positions on the magnesium alloy workpiece 200 to obtain a magnesium alloy assembly 400 with texture and high-brightness metal luster, thereby improving the metal texture and aesthetic degree of the magnesium alloy assembly 400.

[0190] In some embodiments, referring to Figure 17 , Figure 17 , a schematic diagram of a laminated structure of the texture composite layer 360 and the chemical conversion layer 310 provided by some embodiments of the present application, the texture composite layer 360 includes at least one texture layer for realizing light and shadow effects. Specifically, the texture composite layer 360 can include a texture layer, defined as a first texture layer 362, thereby forming a single-texture effect.

[0191] Further, the texture composite layer 360 includes a primer layer 361 and a first texture layer 362, and the forming process of the first texture layer 362 can be: first, a specific glue is sprayed onto the surface of the primer layer 361 by spraying, silk printing, roller printing, shower coating, etc., then a film with a texture structure is attached, and finally it is cured by light. The composition of the specific glue can include a prepolymer curing agent and an additive, the prepolymer can be selected from one or more of polyurethane acrylic resin, polyester acrylic resin, and epoxy acrylate (EA), and the process of forming the texture composite layer 360 in step S105 specifically includes:

[0192] S1051, forming a primer layer 361 on the chemical conversion layer 310 of the second region 220;

[0193] S1052, forming a first texture layer 362 on the primer layer 361.

[0194] The primary function of the primer layer 361 is to improve the adhesion between the first texture layer 362 and the surface of the magnesium alloy workpiece 200 and to mask the natural color of the magnesium alloy workpiece 200. Specifically, the primer layer 361 is prepared by applying paint to the surface of the magnesium alloy workpiece 200 and then thermally curing it. In some embodiments, the thickness of the primer layer 361 may be 10 μm to 50 μm. For example, the thickness of the primer layer 361 may be 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, etc.

[0195] The paint composition forming the primer layer 361 may include a prepolymer, a curing agent, a diluent and an additive, wherein the prepolymer component is composed of a modified acrylic resin and a polyester acrylic resin, for example, 80% of a modified acrylic resin and 20% of a polyester acrylic resin. The curing agent is also called a hardener, which is used to promote the curing of the paint on the surface of the magnesium alloy workpiece 200. For example, the curing agent can be aliphatic amines, ethylenetriamine (DETA), diaminocyclohexane (DACH), etc. The diluent is also called a paint thinner. It is a liquid solvent with good miscibility with the resin and is added to reduce the viscosity of the resin and improve its process performance. It can include two types of active diluents and inactive diluents. Additives mainly include pigments, leveling agents, etc. Leveling agents are divided into two categories. One type works by adjusting the viscosity and leveling time of the paint. This type of leveling agent is generally a high-boiling-point organic solvent or a mixture thereof, such as isophorone (C9H 14 O), diacetone alcohol (C6H 12 O2) and the other type works by adjusting the surface properties of the paint, thereby achieving good leveling of the paint film. Furthermore, the mass fraction of additives, diluents and curing agents can be 40% to 60%.

[0196] So, in Figure 17 In the illustrated embodiment, the chemical conversion layer 310 of the second region 220 of the ultimately formed magnesium alloy component 400 exhibits a single texture effect of the primer layer 361 and the first texture layer 362 superimposed on each other.

[0197] In other embodiments, the textured composite layer 360 may include two texture layers. For example, one texture layer may create light and shadow colors, while the other texture layer may create a matte texture, creating both visual and tactile texture effects. In some embodiments, a transition layer may be provided between the two texture layers to enhance adhesion between the two texture layers. The textured composite layer 360 may also include three texture layers. For ease of description, the following description will specifically describe the effects of the textured composite layer 360 using a two-texture layer configuration.

[0198] In some embodiments, see Figure 18 , Figure 18A schematic diagram of the stack structure of the texture composite layer 360 and the chemical conversion layer 310 provided for another embodiment of the present application is shown in FIG. 10, in which Figure 18 In the embodiment of the texture composite layer 360 shown in FIG. 10, the texture composite layer 360 includes a first texture layer 362, a second texture layer 367, and a first transition layer 364 between the first texture layer 362 and the second texture layer 367, and the purpose of the first transition layer 364 is to connect the first texture layer 362 and the second texture layer 367, and realize close adhesion with the first texture layer 362 and the second texture layer 367. At this time, the process of forming the texture composite layer 360 in step S105 specifically includes:

[0199] S1051, forming a primer layer 361 on the chemical conversion layer 310 of the second area 220;

[0200] S1052, forming the first texture layer 362 on the primer layer 361;

[0201] S1053, forming the first transition layer 364 on the first texture layer 362;

[0202] S1054, forming the second texture layer 367 on the first transition layer 364.

[0203] Specifically, the main component of the first transition layer 364 can be any one of polyurethane acrylic resin, polyester acrylic resin, and epoxy acrylic resin. For example, the first transition layer 364 can use epoxy acrylic resin as the main component, and the first transition layer 364 material is coated on the outside of the first texture layer 362 by spraying, silk printing or pouring method, and then solidified to form the first transition layer 364. The thickness of the first transition layer 364 can be 5-10 μm.

[0204] In the embodiment of the texture composite layer 360 shown in FIG. 10, Figure 18 In the embodiment of the texture composite layer 360 shown in FIG. 10, the chemical conversion layer 310 of the second area 220 of the finally formed magnesium alloy assembly 400 presents a double-texture effect of the superimposed primer layer 361, the first texture layer 362, the first transition layer 364, and the second texture layer 367.

[0205] In some embodiments, the texture composite layer 360 further includes at least one gloss layer between the first texture layer 362 and the second texture layer 367, and the main function of the gloss layer is to realize the metal gloss effect and the metal light and shadow effect. Please refer to Figure 19 , Figure 19Fig. 6 shows a schematic diagram of a stack structure of the texture composite layer 360 and the chemical conversion layer 310 according to another embodiment of the present application. In this embodiment, the gloss layer includes one layer, which is defined as the first gloss layer 363, and the texture composite layer 360 includes the primer layer 361, the first texture layer 362, the first gloss layer 363 and the second texture layer 367. The process of forming the texture composite layer 360 in step S105 specifically includes:

[0206] S1051, forming the primer layer 361 on the chemical conversion layer 310 of the second area 220;

[0207] S1052, forming the first texture layer 362 on the primer layer 361;

[0208] S1055, forming the first gloss layer 363 on the first texture layer 362;

[0209] S1056, forming the first transition layer 364 on the first gloss layer 363;

[0210] S1057, forming the second texture layer 367 on the first transition layer 364.

[0211] The first gloss layer 363 can be formed by vacuum evaporation or magnetron sputtering. Specifically, the target material is deposited on the surface of the first texture layer 362, so as to achieve better metal gloss effect. For example, the target material can be one or more of SiO, ZrO2, Ti3O5, SiO2, Ti3O5, SiO2, Ti3O5. In some embodiments, the first gloss layer 363 can be a composite film layer, i.e. a film layer with composite gloss effect is formed by multiple target materials. The thickness of the first gloss layer 363 can be set according to the appearance requirement. In some embodiments, the thickness of the first gloss layer 363 can be 100 nm-500 nm. For example, the thickness of the first gloss layer 363 can be 100 μm, 150 μm, 200 μm, 300 μm, 400 μm, 500 μm, etc.

[0212] After the first gloss layer 363 is formed, the first transition layer 364 is formed on the first gloss layer 363, so that the first transition layer 364 transitions the first gloss layer 363 and the second texture layer 367, and improves the adhesion effect of the second texture layer 367.

[0213] The forming process of the second textured layer 367 can refer to the forming process of the first textured layer 362, and in order to make the second textured layer 367 and the first textured layer 362 form different textured effects, the texture structures of the film pieces of the second textured layer 367 and the film pieces of the first textured layer 362 are different, for example, the film pieces of the first textured layer 362 form a light and shadow effect, and the film pieces of the second textured layer 367 form a frosted textured effect. The thickness of the first textured layer 362 and the thickness of the second textured layer 367 can be the same or different, and in some embodiments, the thickness of the first textured layer 362 and the thickness of the second textured layer 367 both satisfy 10 μm-25 μm, and for example, the thickness of the first textured layer 362 can be 10 μm, 15 μm, 20 μm, 25 μm, etc., and the thickness of the second textured layer 367 can be 10 μm, 15 μm, 20 μm, 25 μm, etc.

[0214] In Figure 19 In the embodiment shown, the primer layer 361, the first gloss layer 363, the first transition layer 364 and the second textured layer 367 are stacked on the chemical conversion layer 310 of the second area 220 of the finally formed magnesium alloy component 400, and a double-textured single-gloss film coating effect is presented.

[0215] In some embodiments, referring to Figure 20 , Figure 20 The schematic diagram of the stacked structure of the textured composite layer 360 and the chemical conversion layer 310 of the second area 220 provided by some other embodiments of the present application is shown in FIG. 6, the gloss layer includes two layers, which are the first gloss layer 363 and the second gloss layer 365, and the transition layer includes two layers, which are the first transition layer 364 and the second transition layer 366, and at this time, the process of forming the textured composite layer 360 in step S105 specifically includes:

[0216] S1051, forming the primer layer 361 on the chemical conversion layer 310 of the second area 220;

[0217] S1052, forming the first textured layer 362 on the primer layer 361;

[0218] S1055, forming the first gloss layer 363 on the first textured layer 362;

[0219] S1056, forming the first transition layer 364 on the first gloss layer 363;

[0220] S1058, forming the second gloss layer 365 on the first transition layer 364;

[0221] S1059, forming the second transition layer 366 on the second gloss layer 365;

[0222] S1100, forming the second textured layer 367 on the second transition layer 366.

[0223] Second gloss layer 365 functions similarly to first gloss layer 363, acting as a superposition to produce a metallic gloss and metallic light and shadow effect. Similarly, second transition layer 366 functions similarly to first transition layer 364. Forming second transition layer 366 on second gloss layer 365 allows for transition between second gloss layer 365 and second texture layer 367, enhancing the adhesion of second texture layer 367.

[0224] The formation process of the second glossy layer 365 and the second transition layer 366 can refer to the formation process of the first glossy layer 363 and the formation process of the first transition layer 364, and the formation process of the texture layer. Figure 20 In the illustrated embodiment, the chemical conversion layer 310 of the second region 220 of the ultimately formed magnesium alloy component 400 exhibits a double-texture double-gloss coating effect in which a primer layer 361, a first gloss layer 363, a first transition layer 364, a second gloss layer 365, a second transition layer 366, and a second texture layer 367 are superimposed.

[0225] The textured composite layer 360 formed in any of the above-described embodiments does not require prior preparation and can be formed sequentially on the chemical conversion layer 310 in the second region 220 in a hierarchical structure. This simplifies the preparation process and enables the achievement of a multi-textured coating effect through lamination. In other embodiments, the textured composite layer 360 can also be formed directly on the second region 220. In this case, the chemical conversion layer 310 need not be formed in the second region 220, and the textured composite layer 360 of any of the above-described embodiments can be formed directly on the surface of the magnesium alloy workpiece 200 in the second region 220.

[0226] Hereinafter, a magnesium alloy component 400 is obtained by processing a magnesium alloy workpiece 200 to form Figure 1 The outer shell of the electronic device 100 shown in FIG. can first obtain a magnesium alloy workpiece 200 through a casting process, see Figure 21a and Figure 21b , Figure 21a and Figure 21b Both show a magnesium alloy workpiece 200 including a back plate 230 and a frame 240 . The frame 240 is disposed around the back plate 230 . The back plate 230 has a first surface 231 and a second surface 232 that are opposite to each other in a thickness direction thereof.

[0227] In some embodiments, the first back plate 121 in the above embodiments can constitute the back plate 230 of the magnesium alloy workpiece 200, the first surface 231 is constituted by the first surface 1211 of the first back plate 121, the second surface 232 is constituted by the second surface 1212 of the first back plate 121, and the first frame 122 can constitute the frame 240 of the magnesium alloy workpiece 200, so that the finally obtained magnesium alloy assembly 400 constitutes the first shell 12 of the electronic device 100. For the connection and setting position of the back plate 230 and the frame 240, refer to the above description of the first back plate 121 and the first frame 122 of the first shell 12, and details are not repeated here.

[0228] In some embodiments, please continue to refer to Figure 21a , Figure 21a The structure diagram of the first magnesium alloy assembly 400 formed for the magnesium alloy workpiece 200 with the back plate 230 and the frame 240, the second area 220 is formed on the back plate 230, the connection between the back plate 230 and the frame 240 forms the first area 210, and the magnesium alloy workpiece 200 can form a high light surface on the first area 210 and form a corresponding laminated structure (including but not limited to the first transparent protective layer 320, the second transparent protective layer 330, and the transparent appearance layer 340) to make a local highlight effect, and form the texture composite layer 360 on the second area 220 to make a dazzling texture effect.

[0229] In some other embodiments, please continue to refer to Figure 21b , Figure 21b The structure diagram of the second magnesium alloy assembly 400 formed for the magnesium alloy workpiece 200 with the back plate 230 and the frame 240, the second area 220 is formed on the back plate 230, the connection between the back plate 230 and the frame 240 and the surface of the frame 240 forms the first area 210, and the magnesium alloy workpiece 200 can form a high light surface on the first area 210 and form a corresponding laminated structure (including but not limited to the first transparent protective layer 320, the second transparent protective layer 330, and the transparent appearance layer 340) to make a local highlight effect, and form the texture composite layer 360 on the second area 220 to make a dazzling texture effect.

[0230] In some other embodiments, the above Figure 4The second back panel 211a shown constitutes the back panel 230 of the magnesium alloy workpiece 200, the third frame 211c constitutes the frame 240 of the magnesium alloy workpiece 200, and the magnesium alloy component 400 constitutes the second shell 211 of the electronic device 100. At this time, the connection position between the second back panel 211a and the third frame 211c, or the outer surface of the third frame 211c, or the connection between the third frame 211c and the panel 211b can form the first area 210.

[0231] In other embodiments, see Figure 22 , Figure 22 The following is a schematic diagram of the structure of the electronic device 100 provided in some other embodiments of the present application. When the electronic device 100 is a mobile phone, the magnesium alloy component 400 can also constitute the third shell 40 of the mobile phone. The third shell 40 includes a third back plate 41 and a fourth frame 42 surrounding the third back plate 41. A camera 411 is provided on the side of the third back plate 41 facing away from the fourth frame 42. In this case, the side of the third back plate 41 with the camera 411 can form the second area 220. The connection between the third back plate 41 and the fourth frame 42 or the outer surface of the fourth frame 42 can form the first area 210, thereby forming a mobile phone with a large surface texture and a local highlight superposition effect. That is, the third back plate 41 can constitute the back plate 230 of the magnesium alloy workpiece 200, and the fourth frame 42 can constitute the frame 240 of the magnesium alloy workpiece 200.

[0232] In some embodiments, Figure 21a or Figure 21b In the embodiment shown, the magnesium alloy workpiece 200, the connection between the back plate 230 and the frame 240 forms a first region 210. Step S102 of performing CNC high-gloss processing on the first region 210 of the magnesium alloy workpiece 200 to form a high-gloss surface specifically includes:

[0233] S1021, performing CNC cutting on the connection between the second surface 232 and the frame 240 to form a chamfer;

[0234] S1022 , performing CNC highlight processing on the chamfer to obtain a first highlight surface 210 a , and forming a first transparent protective layer 320 on the outer side of the first highlight surface 210 a using the cutting fluid used in the CNC highlight processing.

[0235] Through step S1021 and step S1022, local highlights can be formed at the chamfered position. Specifically, through step S1021, CNC cutting is performed at the connection between the second surface 232 and the frame 240 to form a chamfer. That is, the outer surface of the magnesium alloy workpiece 200 is cut to form a chamfer. For example, the chamfer can be a C angle or an R angle. The C angle is a Chamfer angle, and the C angle refers to a 45-degree chamfer. At this time, a 45-degree chamfered plane is formed at the connection between the second surface 232 and the frame 240, and the R angle is a Radius angle (such as Figure 21a and Figure 21b The R angle is shown as the transition arc at the intersection of two planes. In this case, the connection between the second surface 232 and the outer surface of the frame 240 forms an arc connection surface. After the chamfer is formed, the chamfered surface is subjected to CNC highlighting in step S1022 to obtain a first highlight surface 210a. The cutting fluid used during the CNC highlighting process forms a first transparent protective layer 320 on the outer side of the first highlight surface 210a.

[0236] In some embodiments, Figure 21a In the embodiment shown, only the chamfer at the connection between the second surface 232 and the frame 240 is highlighted, and the surface of the frame 240 is not highlighted. In this case, before step S1021, the following steps are further included:

[0237] S1023 , forming an opaque exterior layer 350 on the surface of the frame 240 .

[0238] After completing the formation of all film layers on the frame 240 (including but not limited to the chemical conversion layer 310 and the opaque appearance layer 350), the connection position between the frame 240 and the back panel 230 is highlighted. In this way, when cutting to form the chamfer, not only can the accumulated paint or overflowed glue on the edge of the frame 240 be removed, but the processing step of the first highlight surface 210a is placed at the end of the entire highlight processing method to avoid damage to the first highlight surface 210a during other processing, which affects the highlight effect of the first highlight surface 210a.

[0239] Specifically, the preparation process of the opaque exterior layer 350 can refer to the preparation process of the transparent exterior layer 340. That is, the opaque exterior layer 350 can also be formed by electrophoresis or spray painting. The difference is that electrophoresis requires the use of an opaque electrophoretic paint material, while spray painting requires the use of an opaque spray paint. In some embodiments, the thickness of the opaque exterior layer 350 formed by electrophoresis can be 10μm-25μm, while the thickness of the opaque exterior layer 350 formed by spray painting can be 10μm-50μm.

[0240] See also Figure 23 , Figure 23 for Figure 21aA partial preparation process diagram of the magnesium alloy component 400 shown in FIG. 1 is shown in FIG. 2.

[0241] A1: providing a magnesium alloy workpiece 200, at this time, the junction between the second surface 232 and the frame 240 is connected at right angles;

[0242] A2: forming a chemical conversion layer 310 on the surface of the magnesium alloy workpiece 200 through step S101;

[0243] A3: forming an opaque appearance layer 350 on the surface of the frame 240 through step S1023;

[0244] A4: performing CNC cutting on the junction between the second surface 232 and the frame 240 to form a chamfer through step S1021, and performing CNC high light processing on the surface of the chamfer through step S1021, thereby obtaining a first high light surface 210a, at this time, the chemical conversion layer 310 and the opaque appearance layer 350 at the chamfer position are removed, and at the same time, the first transparent protective layer 320 is formed on the first high light surface 210a, for the convenience of description, in Figure 23 , two figures are used to respectively show the first high light surface 210a and the first transparent protective layer 320, but it does not mean that the formation of the first high light surface 210a and the formation of the first transparent protective layer 320 have a sequence.

[0245] A5: forming other film layers (such as forming a second transparent protective layer 330 through step S103, and forming a transparent appearance layer 340 through step S104) on the first high light surface 210a to perform transparent protection, and finally forming the magnesium alloy component 400 in which the first high light surface 210a is stacked with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340 in the first area 210.

[0246] In some embodiments, in Figure 21b the embodiment shown, the high light surface 200a includes the first high light surface 210a and the second high light surface 210b, specifically, at this time, step S1022 includes:

[0247] S10221, performing CNC high light processing on the chamfer to obtain the first high light surface 210a, and performing CNC high light processing on the surface of the frame 240 to obtain the second high light surface 210b, and the cutting fluid used in the CNC high light processing forms the first transparent protective layer 320 on the outside of the first high light surface 210a and the outside of the second high light surface 210b.

[0248] Through step S10221, the local high light can be formed at the chamfer position and the surface of the frame 240 at the same time. Specifically, refer to Figure 24 , Figure 24 for Figure 21b A partial preparation process diagram of the magnesium alloy component 400 shown in FIG. 1 is shown in FIG. 2.

[0249] A1: A magnesium alloy workpiece 200 is provided, wherein the second surface 232 and the frame 240 are connected at a right angle;

[0250] A2: forming a chemical conversion layer 310 on the surface of the magnesium alloy workpiece 200 through step S101;

[0251] A3: Through step S1021, CNC cutting is performed at the connection between the second surface 232 and the frame 240 to form a chamfer. Through step S10221, CNC highlighting is performed on the surface of the chamfer and the frame 240 to obtain a first highlight surface 210a and a second highlight surface 210b. At this time, the chemical conversion layer 310 is formed on the chamfer and the frame 240, and at the same time, a first transparent protective layer 320 is formed on the first highlight surface 210a, and a first transparent protective layer 320 is formed on the second highlight surface 210b. Similarly, for ease of explanation, in Figure 21, two figures are used to respectively show the first highlight surface 210a and the second highlight surface 210b, as well as the first transparent protective layer 320, but this does not mean that there is a sequence in the formation of the first highlight surface 210a, the second highlight surface 210b, and the first transparent protective layer 320.

[0252] A4: Other film layers are formed through other steps (such as forming a second transparent protective layer 330 through step S103, forming a transparent appearance layer 340 through step S104, etc.), and transparent protection is performed on the first high-gloss surface 210a and the second high-gloss surface 210b, and finally a magnesium alloy component 400 is formed in the first area 210, in which the first high-gloss surface 210a is superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340, and the second high-gloss surface 210b is superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340.

[0253] In other embodiments, Figure 23 and Figure 24 In the embodiment of the preparation process diagram of the magnesium alloy component 400 shown, after the highlight surface 200a (including the first highlight surface 210a and the second highlight surface 210b) is formed, the magnesium alloy component 400 can also be directly obtained through an intermediate step, that is, on the highlight surface 200a of the magnesium alloy component 400, only the first transparent protective layer 320 can be set, or the first transparent protective layer 320 and the second transparent protective layer 330 can be set, or the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340 can be set. Regarding the number of transparent film layers on the highlight surface of the final magnesium alloy component 400, this application does not limit it here.

[0254] In other embodiments, the CNC high light processing can also be performed on the surface of the frame 240 alone, that is, only the surface of the frame 240 presents the high light effect, and the chamfered portion does not present the high light effect. The specific process can refer to the description of any of the above embodiments, which will not be described here.

[0255] In some embodiments, referring back to Figure 21a With Figure 21b , the second region 220 is the second surface 232 of the back plate 230. Thus, when the magnesium alloy assembly 400 constitutes the appearance shell (such as the first shell 12 or the third shell 40) of the electronic device 100, the side of the appearance shell presents the high light effect, and the upper large surface of the appearance shell forms the composite texture effect, thereby providing an electronic device 100 with a delicate appearance of a large surface of a dazzling texture and a local high light metal luster, and improving the texture and metal sense of the electronic device 100.

[0256] In some embodiments, the step S105 of forming the texture composite layer 360 is performed before the step S102 of performing the CNC high light processing on the first region 210 of the magnesium alloy workpiece 200, that is, the preparation process of the texture composite layer 360 of the second region 220 provided in any of the above embodiments of the present application is prior to the CNC high light processing on the first region 210 in time sequence.

[0257] Referring back to Figure 25 , Figure 25 For Figure 21a the preparation process diagram of the magnesium alloy assembly 400 shown in FIG. 5 is as follows:

[0258] A1: providing a magnesium alloy workpiece 200, at this time, the connection between the second surface 232 and the frame 240 is a right angle connection;

[0259] A2: forming a chemical conversion layer 310 on the surface of the magnesium alloy workpiece 200 by the step S101;

[0260] A3: forming a texture composite layer 360 on the second surface 232 by the step S105;

[0261] A4: forming an opaque appearance layer 350 on the surface of the frame 240 by the step S1023;

[0262] A5: performing CNC cutting to form a chamfer at the connection between the second surface 232 and the frame 240 by the step S1021, and performing CNC high light processing on the surface of the chamfer by the step S1021, thereby obtaining a first high light surface 210a, at this time, the chemical conversion layer 310, the texture composite layer 360 and the opaque appearance layer 350 at the chamfered position are removed, and at the same time, a first transparent protective layer 320 is formed on the first high light surface 210a;

[0263] A6: other film layers are formed through other steps (such as forming a second transparent protective layer 330 through step S103 and forming a transparent appearance layer 340 through step S104 ) to provide transparent protection for the first high-gloss surface 210 a .

[0264] In this way, a magnesium alloy component 400 is formed in which a first high-gloss surface 210a in the first area 210 is superimposed with a first transparent protective layer 320, a second transparent protective layer 330 and a transparent appearance layer 340, and a second surface 232 in the second area 220 is superimposed with a textured composite layer 360, thereby achieving an appearance effect of large-area colorful texture and local high-gloss superposition of the magnesium alloy component 400.

[0265] See also Figure 26 , Figure 26 for Figure 21b The preparation process diagram of the magnesium alloy component 400 is shown below:

[0266] A1: A magnesium alloy workpiece 200 is provided, wherein the second surface 232 and the frame 240 are connected at a right angle;

[0267] A2: forming a chemical conversion layer 310 on the surface of the magnesium alloy workpiece 200 through step S101;

[0268] A3: forming a textured composite layer 360 on the second surface 232 through step S105;

[0269] A4: Through step S1021, CNC cutting is performed at the connection between the second surface 232 and the frame 240 to form a chamfer, and through step S10221, CNC highlighting is performed on the surface of the chamfer and the frame 240 to obtain a first highlight surface 210a and a second highlight surface 210b. At this time, the texture composite layer 360 and the chemical conversion layer 310 on the chamfer are removed, and the chemical conversion layer 310 on the frame 240 is removed. At the same time, a first transparent protective layer 320 is formed on the first highlight surface 210a, and a first transparent protective layer 320 is formed on the second highlight surface 210b.

[0270] A5: other film layers are formed through other steps (such as forming a second transparent protective layer 330 through step S103 and a transparent appearance layer 340 through step S104 ) to provide transparent protection for the first high-gloss surface 210 a and the second high-gloss surface 210 b .

[0271] In this way, a magnesium alloy component 400 is formed in which the first high-gloss surface 210a in the first area 210 is superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340, the second high-gloss surface 210b is superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340, and the second surface 232 in the second area 220 is superimposed with the texture composite layer 360, thereby achieving an appearance effect of large-area colorful texture and local highlight superposition.

[0272] exist Figure 25 and Figure 26 In the embodiment shown, the preparation of the second surface 232 of the back panel 230 can be performed before the preparation of the first area 210. In this way, when the back panel 230 is cut to form a chamfer, not only can the accumulated paint or overflowed glue on the edge of the second surface 232 be removed, but the processing steps of the first highlight surface 210a and the second highlight surface 210b can also be placed at the end of the entire highlight processing method, so as to avoid damage to the first highlight surface 210a and the second highlight surface 210b when the texture composite layer 360 is coated on the second surface 232 of the back panel 230, thereby affecting the highlight effect of the first highlight surface 210a and the second highlight surface 210b.

[0273] The present application also provides a magnesium alloy assembly 400, such as in any of the embodiments. The magnesium alloy assembly 400 in this embodiment can be produced using the processing method for the magnesium alloy assembly in any of the above embodiments, or by other methods, without limitation in this application. The magnesium alloy assembly 400 can be used as the exterior housing of the electronic device 100, such as the first housing 12, the second housing 211, the third housing 40, and the like, and can also be used to produce other structures.

[0274] The present application also provides a cutting fluid according to any of the above embodiments, and a protective fluid according to any of the above embodiments. The cutting fluid and protective fluid are used in the processing method of the magnesium alloy component 400 according to any of the above embodiments to prevent the magnesium alloy workpiece 200 from being corroded and oxidized during the process of manufacturing the magnesium alloy component 400, thereby obtaining a corrosion-resistant magnesium alloy component 400 having a localized highlight effect. Furthermore, the magnesium alloy component 400 according to any of the embodiments of the present application can simultaneously have a dual composite effect of large-scale colorful texture and localized highlight, thereby enhancing the texture and metallic feel of the magnesium alloy component 400 and the electronic device 100 formed using the magnesium alloy component 400.

[0275] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0276] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for processing a magnesium alloy component, characterized in that: include: Providing a magnesium alloy workpiece; performing CNC high-gloss processing on the first area of ​​the magnesium alloy workpiece to form a high-gloss surface; The cutting fluid used in the CNC highlight treatment forms a first transparent protective layer on the outer side of the highlight surface, and the cutting fluid at least includes an alkyl sulfonate and a surfactant.

2. The method for processing a magnesium alloy component according to claim 1, wherein: The cutting fluid further comprises a first alkaline solvent, a complexing agent and water.

3. The method for processing a magnesium alloy component according to claim 1 or 2, characterized in that: The mass fraction of the alkyl sulfonate is less than or equal to 5%.

4. The method for processing a magnesium alloy component according to any one of claims 1 to 3, characterized in that: After the step of performing CNC high-gloss processing on the first area of ​​the magnesium alloy workpiece to form a high-gloss surface, the step further includes: A protective liquid is provided to form a second transparent protective layer on the outer side of the high gloss surface, wherein the protective liquid at least includes silane.

5. The method for processing a magnesium alloy component according to claim 4, wherein: The protective solution further comprises a complexing agent, a second alkaline solvent, sodium citrate, an inhibitor and water.

6. The method for processing a magnesium alloy component according to claim 4 or 5, characterized in that: The mass fraction of the silane is greater than or equal to 2% and less than or equal to 10%.

7. The method for processing a magnesium alloy component according to any one of claims 4 to 6, characterized in that: The step of providing a protective liquid to form a second transparent protective layer on the outer side of the high gloss surface specifically includes: performing a degreasing treatment on the first area to remove grease on the surface of the first transparent protective layer and / or removing the first transparent protective layer; The protective liquid is provided to soak the first area to form the second transparent protective layer on the outer side of the high-gloss surface.

8. The method for processing a magnesium alloy component according to any one of claims 1 to 7, characterized in that: After the step of performing CNC high-gloss processing on the first area of ​​the magnesium alloy workpiece to form a high-gloss surface, the method further includes: A transparent appearance layer is formed on the outer side of the high gloss surface.

9. The method for processing a magnesium alloy component according to claim 8, wherein: The step of forming a transparent appearance layer on the outer side of the high gloss surface specifically includes: The transparent appearance layer is formed on the outer side of the high gloss surface by transparent electrophoresis or transparent spray painting.

10. The method for processing a magnesium alloy component according to any one of claims 1 to 9, characterized in that: The magnesium alloy workpiece includes a back plate and a frame, the back plate having a first surface and a second surface opposite to each other in a thickness direction thereof, the frame being arranged around the back plate, the highlight surface including a first highlight surface, and the step of performing CNC highlight processing on the first area of ​​the magnesium alloy workpiece to form the highlight surface includes: Performing CNC cutting on the connection between the second surface and the frame to form a chamfer; The chamfer is subjected to CNC highlighting processing to obtain the first highlight surface.

11. The method for processing a magnesium alloy component according to claim 10, wherein: Before the step of performing CNC cutting on the connection between the second surface and the frame to form a chamfer, the method further includes: An opaque appearance layer is formed on the surface of the frame.

12. The method for processing a magnesium alloy component according to claim 10, wherein: The highlight surface includes two highlight surfaces, and the step of performing CNC highlight processing on the first area of ​​the magnesium alloy workpiece further includes: The surface of the frame is subjected to CNC high-gloss processing to obtain the second high-gloss surface.

13. The method for processing a magnesium alloy component according to any one of claims 1 to 12, characterized in that: Before the step of performing CNC highlight processing on the first area of ​​the magnesium alloy workpiece, the following steps are further included: The surface of the magnesium alloy workpiece is chemically converted to form a chemical conversion layer.

14. The method for processing a magnesium alloy component according to claim 13, wherein: After the step of chemically converting the surface of the magnesium alloy workpiece to form a chemical conversion layer, the method further comprises: A textured composite layer is formed in the second region of the magnesium alloy workpiece, wherein the textured composite layer includes at least one texture layer.

15. The method for processing a magnesium alloy component according to claim 14, wherein: The textured composite layer includes a first texture layer, a second texture layer, and at least one gloss layer located between the first texture layer and the second texture layer.

16. The method for processing a magnesium alloy component according to claim 14 or 15, characterized in that: The magnesium alloy workpiece includes a back plate and a frame. The back plate has a first surface and a second surface that are opposite to each other in a thickness direction. The frame is arranged around the back plate. The second surface forms the second region.

17. The method for processing a magnesium alloy component according to any one of claims 14 to 16, characterized in that: The step of forming a textured composite layer on the second region of the magnesium alloy workpiece is performed before the step of performing CNC high-brightness treatment on the first region of the magnesium alloy workpiece.

18. A cutting fluid, characterized in that: The cutting fluid comprises alkyl sulfonate, a first alkaline solvent, a surfactant, a complexing agent and water.

19. The cutting fluid according to claim 18, characterized in that The mass fraction of the alkyl sulfonate is less than or equal to 5%, and the mass fraction of the complexing agent is less than or equal to 5%.

20. A protective liquid, characterized in that: include: The protective solution comprises a second alkaline solvent, sodium citrate, a complexing agent, an inhibitor, silane and water.

21. The protective liquid according to claim 20, characterized in that The mass fraction of the silane is greater than or equal to 2% and less than or equal to 10%.

22. A magnesium alloy component, characterized in that: include: A magnesium alloy workpiece, wherein the magnesium alloy workpiece has a first region, wherein the first region has a high-gloss surface; The magnesium alloy component further includes a first transparent protective layer disposed in the first region, wherein the first transparent protective layer comprises at least alkyl sulfonate and a surfactant.

23. The magnesium alloy component according to claim 22, characterized in that The magnesium alloy component further includes a second transparent protective layer disposed outside the first transparent protective layer, and the second transparent protective layer includes at least silane.

24. The magnesium alloy component according to claim 23, characterized in that The first transparent protective layer is a nano protective film, and / or the second transparent protective layer is a nano protective film.

25. The magnesium alloy component according to any one of claims 22 to 24, characterized in that: The magnesium alloy workpiece has a second region, and the magnesium alloy component further includes a chemical conversion layer and a texture composite layer sequentially stacked in the second region, wherein the texture composite layer includes at least a first texture layer.

26. The magnesium alloy component according to claim 25, characterized in that The magnesium alloy workpiece includes a back plate and a frame, the back plate having a first surface and a second surface opposite to each other in a thickness direction thereof, the frame surrounding the back plate, the second surface forming a second area, and a chamfer formed at a connection between the frame and the second surface; The chamfered surface and / or the surface of the frame form the highlight surface.

27. An electronic device, characterized in that: The first shell is manufactured by the processing method of the magnesium alloy component according to any one of claims 1 to 17; And / or, the first shell includes the magnesium alloy component according to any one of claims 22-26.

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