Method for processing magnesium alloy assembly, magnesium alloy assembly, and electronic device

Abstract

The application discloses a magnesium alloy component processing method, a magnesium alloy component and an electronic device, and relates to the field of metal surface treatment.The processing method of the magnesium alloy comprises the following steps: providing a magnesium alloy workpiece; performing CNC high light processing on a first region of the magnesium alloy workpiece to form a high light surface; and forming a first transparent protective layer on the outer side of the high light surface by using a cutting fluid during the CNC high light processing, wherein the cutting fluid at least comprises alkyl sulfonate and a surfactant.The magnesium alloy component processing method provided by the embodiment of the application provides the cutting fluid capable of forming the first transparent protective layer, forms the protection of the high light surface at the same time when cutting is completed, avoids the case that the high light surface is easily corroded and loses luster by contacting oxygen and water, and does not need to additionally polish the high light surface, so that the magnesium alloy component with better metal high light quality is prepared.

Description

Technical Field

[0001] This application relates to the field of metal surface treatment technology, and in particular to a processing method for magnesium alloy components, magnesium alloy components, and electronic devices. Background Technology

[0002] Smartphones, tablets, and other electronic devices have become an indispensable part of people's daily lives. As consumers increasingly demand thinner and lighter electronic devices, magnesium alloys, which have a lower density than aluminum alloys, are becoming increasingly popular for casings. However, magnesium alloys are chemically reactive, making their casings prone to corrosion during manufacturing. This makes it difficult to achieve a high-gloss metallic finish and a more sophisticated appearance, resulting in low yield rates. Summary of the Invention

[0003] This application provides a method for processing magnesium alloy components, magnesium alloy components, and electronic devices to solve the technical problem that magnesium alloy outer casings are easily corroded during manufacturing.

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

[0005] In a first aspect, this application provides a method for processing a magnesium alloy component, the method comprising:

[0006] A magnesium alloy workpiece is provided, and a first region of the magnesium alloy workpiece is subjected to CNC high-gloss treatment to form a high-gloss surface. The cutting fluid used in the high-gloss CNC high-gloss treatment forms a first transparent protective layer on the outside of the high-gloss surface. The cutting fluid includes at least alkyl sulfonate and surfactant.

[0007] The processing method for magnesium alloy components provided in this application provides a cutting fluid capable of forming a first transparent protective layer while performing high-gloss treatment on the magnesium alloy workpiece. This forms a protective layer on the high-gloss surface at the same time as the cutting is completed, preventing the high-gloss surface from being easily corroded and losing its luster when exposed to oxygen and water. Furthermore, it eliminates the need for additional polishing of the high-gloss surface, avoiding the possibility of polishing causing new damage to the high-gloss surface. This process results in the preparation of a magnesium alloy component with a better metallic high-gloss texture.

[0008] In one possible design of the first aspect, the first transparent protective layer can be a nano-protective film. The nano-protective film has a good density and can effectively isolate external oxygen and water, preventing oxygen and water from passing through the first transparent protective layer and coming into contact with the glossy surface.

[0009] In one 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. Exemplarily, 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, also called a coordination agent, can, exemplarily, be one or more of disodium ethylenediaminetetraacetate (EDTA-2Na), disodium citric acid (C₆H₆Na₂O₇), and tartaric acid (C₄H₆O₆). The complexing agent can form stable complexes with metal ions, thereby improving the adsorption effect of the cutting fluid on the high-gloss surface. Simultaneously, the complexing agent can prevent the high-gloss surface from undergoing oxidation with oxygen, thereby isolating the high-gloss surface from oxygen.

[0010] In one possible design approach 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%, etc.

[0011] In one 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%, etc.

[0012] In one 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%, etc.

[0013] Surfactants, alkyl sulfonates, a first alkaline solvent, and a complexing agent are added to water in a certain mass fraction to form the final cutting fluid. This makes the cutting fluid provided in the embodiments of this application not only have lubrication, cooling, and cleaning functions, but also have the function of sedimentation coating, forming a first transparent protective layer to protect the high-gloss surface.

[0014] In one possible design approach of the first aspect, after the step of CNC high-gloss treatment of the first region of the high-gloss 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 outer side of the high-gloss surface, the protective liquid comprising at least silane. The formation of the second transparent protective layer maintains the high-gloss effect of the high-gloss surface, prevents oxidation of the high-gloss surface, and improves the adhesion between the subsequent coating layer and the magnesium alloy. That is, the second transparent protective layer can not only effectively adhere to the surface of the high-gloss surface, but also effectively adhere to other coating layers formed on its outer side.

[0015] In one possible design of the first aspect, the protective fluid 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 fluid can be 8-12. The role of sodium citrate in the protective fluid is to remove trace amounts of oxides present on the high-gloss surface, thereby ensuring the restoration of the metallic luster of the magnesium alloy workpiece surface. The inhibitor, also known as a corrosion inhibitor, can be, for example, 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.

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

[0017] In one possible design of the first aspect, the mass fraction of the second alkaline solvent may be less than or equal to 10%, the mass fraction of sodium citrate may be less than or equal to 8%, the mass fraction of the complexing agent may be less than or equal to 5%, and the mass fraction of the inhibitor may be less than or equal to 2%. Silane, the complexing agent, the second alkaline solvent, sodium citrate, and the inhibitor are added to water in a certain mass fraction to form the final protective solution. This allows the protective solution provided in the embodiments of this application to generate a second transparent protective layer to protect the high-gloss surface while improving the adhesion between film layers and removing trace oxides from the surface of the high-gloss surface, thus ensuring the metallic luster effect of the high-gloss surface.

[0018] In one possible design of the first aspect, the second transparent protective layer can also be a nano-protective film. The nano-protective film has a good density effect and can effectively isolate external oxygen and water, preventing oxygen and water from passing through the second transparent protective layer and coming into contact with the glossy surface.

[0019] In one possible design of the first aspect, the step of providing a protective liquid to form a second transparent protective layer on the outer side of the glossy surface specifically includes: degreasing the first region to remove grease from the surface of the first transparent protective layer; and immersing the first region in the protective liquid to form a second transparent protective layer on the outer side of the glossy surface. Specifically, the grease on the surface of the first transparent protective layer can be removed by controlling a shorter degreasing time, while retaining the first transparent protective layer. The second transparent protective layer and the first transparent protective layer together provide double protection for the glossy surface.

[0020] In one possible design of the first aspect, the step of providing a protective liquid to form a second transparent protective layer on the outer side of the glossy surface specifically includes: degreasing the first area to remove the first transparent protective layer; and immersing the first area in the protective liquid to form a second transparent protective layer on the outer side of the glossy surface. Specifically, the first transparent protective layer can be removed by controlling a relatively long degreasing time, at which point the grease on the first transparent protective layer is naturally removed. After the first transparent protective layer is removed, the second transparent protective layer continues to protect the glossy surface. Whether or not the first transparent protective layer is removed does not affect the high gloss effect of the glossy surface.

[0021] In one possible design approach of the first aspect, after the step of CNC high-gloss processing of the first region of the magnesium alloy workpiece to form a high-gloss surface, a transparent outer layer is further formed on the outside of the high-gloss surface. The transparent outer layer can be formed on the outside of the first transparent protective layer, providing double transparent protection for the high-gloss surface through the first transparent layer and the transparent outer layer; alternatively, the transparent outer layer can be formed on the outside of the second transparent protective layer, providing triple transparent protection for the high-gloss surface through the first transparent protective layer, the second transparent protective layer, and the transparent outer layer.

[0022] In one possible design approach of the first aspect, the transparent appearance layer can be formed by transparent electrophoresis to maintain the continuous high gloss and high transparency effect of the high gloss surface. For example, a transparent cathodic electrophoretic paint based on conventional acrylic resin system can be deposited on the outer side of the high gloss surface of the first region under the action of an electric field.

[0023] In one possible design approach of the first aspect, the transparent appearance layer can also be formed by transparent spraying to maintain the continuous high gloss and high transparency effect of the high gloss surface. The transparent spraying can be applied by spraying or coating, applying the transparent coating to the high gloss surface and baking to cure it on the surface.

[0024] In one possible design approach of the first aspect, prior to the step of CNC high-gloss finishing of the first region of the magnesium alloy workpiece, the process 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 enhance the subsequent adhesion of other film layers (including but not limited to a first transparent protective layer, a second transparent protective layer, and a transparent outer layer). The chemical environment for the chemical conversion is generally an environment of phosphate, chromate, phosphate-permanganate, stannate, molybdate, etc., thereby forming a corrosion-resistant chemical conversion layer.

[0025] In one possible design approach of the first aspect, after forming the chemical conversion layer, a textured composite layer is also formed in a second region of the magnesium alloy workpiece.

[0026] The textured composite layer is formed on the chemical conversion layer. The textured composite layer can form texture colors and light and shadow effects, such as shell texture, three-dimensional texture, diamond texture, etc. The first area and the second area are located at different positions on the magnesium alloy workpiece to obtain a magnesium alloy component that has both colorful texture and high-brightness metallic luster, thereby improving the metallic texture and aesthetics of the magnesium alloy component.

[0027] In one possible design approach of the first aspect, the texture composite layer includes at least one texture layer to form a texture composite layer with a single texture effect, such as shell texture, three-dimensional texture, or diamond texture.

[0028] In one possible design approach of the first aspect, the texture composite layer includes a first texture layer and a second texture layer, and at least one gloss layer located between the first texture layer and the second texture layer. The first texture layer can form light and shadow colors, and the second texture layer can form a frosted texture, forming a dual effect of texture visual and tactile. The main function of the gloss layer is to achieve metallic luster effect and metallic light and shadow effect.

[0029] In one possible design approach of the first aspect, forming the textured 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 main function of the primer layer is to improve the adhesion between the first texture layer and the surface of the magnesium alloy workpiece, and to mask the natural color of the magnesium alloy workpiece. The first texture layer can be used to achieve light and shadow effects, ultimately forming a magnesium alloy component with a single texture effect achieved by superimposing the primer layer and the first texture layer.

[0030] In one possible design approach of the first aspect, forming the textured composite layer specifically includes: forming a primer layer on the chemical conversion layer of the second region; forming a first textured layer on the primer layer; forming a first transition layer on the first textured layer; and forming a second textured layer on the first transition layer. The function of the first transition layer is to act as a bridge between the two layers, achieving close adhesion with the first and second textured layers, so that the second region of the magnesium alloy component ultimately presents a dual-texture effect with the primer layer, the first textured layer, the first transition layer, and the second textured layer superimposed.

[0031] In one possible design approach of the first aspect, forming the textured composite layer specifically includes:

[0032] A primer layer is formed on the chemical conversion layer in the second region; a first texture layer is formed on the primer layer; a first gloss layer is formed on the first texture layer; a first transition layer is formed on the first gloss layer; and a second texture layer is formed on the first transition layer. The main function of the first gloss layer is to achieve a metallic gloss effect and a metallic light and shadow effect. After the first gloss layer is formed, a first transition layer is formed on the first gloss layer to allow the first transition layer to transition between the first gloss layer and the second texture layer, thereby improving the adhesion of the second texture layer. The formation process of the second texture layer can refer to the formation process of the first texture layer. Furthermore, in order to create different texture effects between the second texture layer and the first texture layer, the texture structures of the films of the second texture layer and the first texture layer are different. For example, the film of the first texture layer creates a light and shadow effect, while the film of the second texture layer creates a frosted texture effect. The final second region of the magnesium alloy component exhibits a double-texture single-gloss coating effect with the primer layer, the first gloss layer, the first transition layer, and the second texture layer superimposed.

[0033] In one possible design approach of the first aspect, forming the textured composite layer specifically includes: forming a primer layer on the chemical conversion layer of the second region; forming a first textured layer on the primer layer; forming a first gloss layer on the first textured 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 textured layer on the second transition layer. The resulting second region of the magnesium alloy component exhibits a dual-texture, dual-gloss coating effect, consisting of a primer layer, a first gloss layer, a first transition layer, a second gloss layer, a second transition layer, and a second textured layer superimposed on each other.

[0034] In one possible design 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 its thickness direction. The frame surrounds the back plate. The high-gloss surface includes the first high-gloss surface. The step of CNC high-gloss processing of a first region of the magnesium alloy workpiece to form a high-gloss surface includes: CNC cutting the junction of the second surface and the frame to form a chamfer; performing CNC high-gloss processing on the chamfer to obtain the first high-gloss surface; and the cutting fluid used during the CNC high-gloss processing forms a first transparent protective layer on the outside of the first high-gloss surface. In this way, localized high gloss can be formed at the chamfer location.

[0035] In one possible design approach of the first aspect, before the step of CNC cutting to form a chamfer at the junction of the second surface and the frame, a step of forming an opaque appearance layer on the surface of the frame is included. Thus, after all the film layers of the frame are formed, the junction of the frame and the back panel is then highlighted. This way, during the chamfering process, not only can excess paint or adhesive on the frame edges be removed, but the step of processing the first high-gloss surface is also placed last in the entire highlighting process, avoiding damage to the first high-gloss surface during other processing steps and preventing any impact on its high-gloss effect.

[0036] In one possible design approach of the first aspect, the high-gloss surface includes a first high-gloss surface and a second high-gloss surface, and the step of forming the high-gloss surface by CNC high-gloss processing of the first region of the magnesium alloy workpiece includes:

[0037] The chamfer is CNC-high-gloss processed to obtain a first high-gloss surface, and the surface of the frame is CNC-high-gloss processed to obtain a second high-gloss surface. The cutting fluid used in the CNC-high-gloss processing forms a first transparent protective layer on the outside of the first high-gloss surface and the outside of the second high-gloss surface. In this way, local high gloss can be formed at both 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 high-gloss treatment of the first region of the magnesium alloy workpiece. Thus, when the backplate is chamfered, not only can accumulated paint or excess adhesive at the edge of the second surface be removed, but the processing steps of the first and second high-gloss surfaces are also placed at the end of the entire high-gloss treatment method. This avoids damage to the first and second high-gloss surfaces during the coating of the textured composite layer on the second surface of the backplate, thus preventing any impact on the high-gloss effect of the first and second high-gloss surfaces.

[0039] Secondly, this application provides a cutting fluid comprising an alkyl sulfonate, a first alkaline solvent, a surfactant, a complexing agent, and water.

[0040] In one 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 one 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] Thirdly, this application provides a protective liquid comprising a second alkaline solvent, sodium citrate, a complexing agent, an inhibitor, silane, and water.

[0043] In one 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 one 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 one possible design approach in the third aspect, the mass fraction of silane is greater than or equal to 2% and less than or equal to 10%.

[0046] Fourthly, this application provides a magnesium alloy component, including a magnesium alloy workpiece and a first transparent protective layer disposed in a first region. The magnesium alloy workpiece has a first region with a high-gloss surface, and the first transparent protective layer comprises at least an alkyl sulfonate and a surfactant.

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

[0048] In one 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 one possible design of the fourth aspect, the magnesium alloy workpiece has a second region, and the magnesium alloy assembly further includes a chemical conversion layer and a textured composite layer sequentially stacked in the second region, the textured composite layer including at least a first textured layer.

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

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

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

[0053] In one possible design of the fourth aspect, the magnesium alloy component 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 one 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 that are opposite to each other in its thickness direction. The frame surrounds the back plate. The second surface forms a second region. A chamfer is formed at the junction of the frame and the second surface. The chamfered surface forms a high-gloss surface.

[0055] In one 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 that are opposite to each other in its thickness direction. The frame surrounds the back plate. The second surface forms a second region. A chamfer is formed at the junction of the frame and the second surface. The surface of the frame is formed with a high-gloss finish.

[0056] In one possible design of the fourth aspect, the back panel has a first surface and a second surface that are opposite to each other in its thickness direction, a frame surrounds the back panel, the second surface forms a second region, a chamfer is formed at the junction of the frame and the second surface, and the chamfer and the surface of the frame form a high-gloss surface.

[0057] Fifthly, this application provides an electronic device, which includes a first housing, the first housing being prepared using the processing method of the magnesium alloy component in any of the above embodiments.

[0058] In one possible design of the fifth aspect, the first housing comprises the magnesium alloy component of any of the above embodiments.

[0059] In one possible design approach for the fifth aspect, the electronic device is a laptop computer.

[0060] In one possible design of the fifth aspect, the electronic device includes a display, which comprises a screen and a first housing for protecting the screen. The first housing may cover the perimeter of the screen and the back of the screen.

[0061] In one possible design of the fifth aspect, the first housing includes a first back panel, a first bezel, and a second bezel. The first back panel is located on the side of the display screen opposite to the display surface and is stacked with the display screen. The first bezel connects the first back panel and the second bezel, and the second bezel is formed as a rectangular ring frame structure, surrounding the edge of the display screen. The first back panel, the first bezel, and the second bezel enclose the internal mounting space of the display.

[0062] In one 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 side of the first back plate constitutes the first surface of the back plate, and the second side of the first back plate constitutes the second surface of the back plate.

[0063] In one possible design of the fifth aspect, the electronic device includes a host, the host includes a second housing, the second housing includes a second back plate, a front 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 one possible design of the fifth aspect, the electronic device is a mobile phone, which includes a third housing, 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] The technical effects of any of the design methods in aspects two through five can be found in the technical effects of different design methods in aspect one, and will not be repeated here. Attached Figure Description

[0066] Figure 1 Schematic diagrams of the structure of electronic devices provided in some embodiments of this application;

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

[0068] Figure 3 For along Figure 2 Sectional view of line AA in the middle;

[0069] Figure 4 For along Figure 1 Sectional view of the middle BB line;

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

[0071] Figure 6 A process flow diagram illustrating the processing method of magnesium alloy components provided in some embodiments of this application;

[0072] Figure 7 These are schematic diagrams of the structure of magnesium alloy workpieces provided in some embodiments of this application;

[0073] Figure 8 This is a schematic diagram of the structure of a magnesium alloy component provided in some embodiments of this application;

[0074] Figure 9 This is a schematic diagram of the structure of a magnesium alloy component provided in other embodiments of this application;

[0075] Figure 10 Diagram illustrating the process of forming a second transparent protective layer for the protective liquid;

[0076] Figure 11 A detailed process flow diagram for providing a protective liquid to form a second transparent protective layer on the outer side of the high-gloss surface;

[0077] Figure 12 This is a schematic diagram of the structure of a magnesium alloy component provided in some embodiments of this application;

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

[0079] Figure 14 Structural diagrams showing the positional relationship between the chemical conversion layer and the high-gloss surface provided in some embodiments of this application;

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

[0081] Figure 16 for Figure 15 The diagram shows a stacked structure of a magnesium alloy component with a textured composite layer formed on a magnesium alloy workpiece.

[0082] Figure 17 This is a schematic diagram of the stacked structure of the textured composite layer and the chemical conversion layer provided in some embodiments of this application;

[0083] Figure 18 This is a schematic diagram of the stacked structure of the textured composite layer and the chemical conversion layer provided in other embodiments of this application;

[0084] Figure 19 A schematic diagram of the stacked structure of the textured composite layer and the chemical conversion layer provided in some embodiments of this application;

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

[0086] Figure 21a A schematic diagram of the structure of the first type of magnesium alloy assembly formed for a magnesium alloy workpiece having a back plate and a frame;

[0087] Figure 21b A schematic diagram of the structure of a second type of magnesium alloy assembly formed from a magnesium alloy workpiece having a back plate and a frame;

[0088] Figure 22 Schematic diagrams of the structure of electronic devices provided in other embodiments of this application;

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

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

[0091] Figure 25 for Figure 21a The diagram shows the manufacturing process of the magnesium alloy component.

[0092] Figure 26 for Figure 21b The diagram shows the manufacturing process of the magnesium alloy component.

[0093] Figure label:

[0094] 100. Electronic devices;

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

[0096] 20. Main unit; 21. Main unit body; 211. Second shell; 211a. Second back panel; 211b. Front 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, High-gloss surface; 210, First region; 220, Second region; 210a, First high-gloss surface; 210b, Second high-gloss 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 Implementation

[0101] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0102] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0103] In the description of the embodiments of this application, the term "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of a single item or a plurality of items. For example, at least one of a, b, or c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be a single item or multiple items.

[0104] In the description of the embodiments of this application, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" describes an association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "or" relationship.

[0105] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "linking" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixed connection" refers to a connection where the relative positional relationship remains unchanged after the connection.

[0106] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. The directional terms mentioned in the embodiments of this application, such as "inner" and "outer," are only for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of this application, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0107] In the description of embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0108] For ease of understanding, some terms related to the preparation process of this application are explained here:

[0109] Microarc oxidation (MAO):

[0110] Micro-arc oxidation, also known as plasma electrolytic oxidation, can generate oxide coatings on conductive materials such as metallic materials. "Metallic materials" refers to pure metals, metal alloys, intermetallic compounds, or metal-containing complexes. Metallic materials can include aluminum, magnesium, titanium, etc. Micro-arc oxidation utilizes a high electromotive force to generate discharge, and the resulting plasma can modify the structure of the oxide layer.

[0111] Chemical conversion:

[0112] Chemical conversion is the reaction between the surface atoms of a metal (including coated metals) and anions in a medium, forming a well-adhesive insulating layer on the metal surface. This compound insulating layer is called a chemical conversion coating. As a protective layer for metal products, the chemical conversion coating's protective function mainly relies on converting chemically reactive elemental metals into chemically inactive metal compounds, such as oxides, chromates, and phosphates, thereby improving the metal's thermodynamic stability in the environment. There are many types of chemical conversion, such as chromate treatment, phosphate treatment, non-chromium treatment, metal coloring, and chemical polishing. Chemical conversion exhibits excellent corrosion resistance, adsorption capacity, electrical insulation, and non-adhesion to molten metal. It is commonly used for the chemical treatment of steel, aluminum, zinc, stainless steel, copper, and magnesium.

[0113] High-gloss finish on CNC milling machines:

[0114] CNC high-gloss machining is a process in which NC program instructions are input into the memory of a numerical control system, compiled and calculated by the computer, and transmitted to the driver via a displacement control system to drive the motor, thereby cutting and machining the designed parts. Generally, machine tools controlled by a computer are commonly referred to as CNC. For example, diamond tool machining is a high-precision turning technique that uses sharp natural diamond tools to machine soft metals such as aluminum alloys and copper alloys to achieve a bright, shiny surface.

[0115] This application provides an electronic device, including but not limited to mobile phones, laptops, tablet personal computers, e-books, learning machines, wearable devices (e.g., smartwatches, smart bracelets, smart glasses, smart helmets), virtual reality (VR) electronic devices, augmented reality (AR) electronic devices, smart home devices, etc.

[0116] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of an electronic device 100 provided in some embodiments of this application. In this application, a laptop computer is used as an example of the electronic device 100 for illustration, but this should not be construed as a limitation of this 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 housing 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 quantum dot light-emitting diode (QLED) display screen, or a liquid crystal display (LCD). The first housing 12 is used to protect the display screen 11. The first housing 12 can cover the perimeter of the display screen 11 and the back of the display screen 11.

[0118] The host 20 includes a host body 21 and a keyboard 22. The host 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, memory, etc. The host body 21 is used to control the display 10 to display images and videos according to the instructions or data input from the keyboard 22.

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

[0120] Please see 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 be maintained at a target open angle position between 0° and 360°. The target open angle can be a fixed value between 0° and 360°, or any value between 0° and 360°. When the electronic device 100 is in the open state, the user can control the display screen 11 through the host 20, and the user can also view the images or videos displayed on the display screen 11.

[0121] Please see Figure 2 , Figure 2 for Figure 1 The diagram shows a perspective view of the display 10 in the electronic device 100. When the electronic device 100 is in a closed state, the display 10 covers the host 20, and the display surface of the display 10 is opposite to the keyboard 22 of the host 20. This provides scratch and dust protection for the display interface of the display 10 and the keyboard 22 of the host 20. At this time, the first housing 12 forms the exterior surface of the electronic device 100 facing the user.

[0122] For ease of description in the following embodiments, an XYZ coordinate system is established for the display 10. Specifically, the extension direction of the rotation axis between 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 Z-axis directions is defined as the Y-axis direction. It is understood that the coordinate system setting of the display 10 can be flexibly set according to actual needs, and is not specifically limited here.

[0123] Please see Figure 3 , Figure 3 For along Figure 2 A cross-sectional view along line AA shows that the first housing 12 includes a first back plate 121, a first frame 122, and a second frame 123. The first back plate 121 is located on the side of the display screen 11 opposite to the display surface and is stacked with the display screen 11. The first frame 122 connects the first back plate 121 and the second frame 123, and the second frame 123 is formed into a rectangular ring frame structure, surrounding the edge of the display screen 11. The first back plate 121, the first frame 122, and the second frame 123 enclose the internal mounting 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. A first frame 122 surrounds the first back panel 121 and is 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 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 off state, if the user places the electronic device 100 flat on a table, 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 table. At this time, the second frame 123 is directly opposite the keyboard 22.

[0125] In some embodiments, please refer to Figure 4 , Figure 4 For along Figure 1 A cross-sectional view along line BB shows that the second housing 211 includes a second back plate 211a, a front panel 211b, and a third frame 211c, with the third frame 211c connecting the second back plate 211a and the front panel 211b. The front panel 211b is located on the side where the keyboard 22 is located and surrounds the outer periphery of the keyboard 22. In some embodiments, please refer to... Figure 1 and Figure 4 The main unit 21 has a touchpad area 211d on its front panel 211b, through which the user can operate the mouse. The second back panel 211a faces away from the keyboard 22 and is positioned opposite to the front 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 fit against the table.

[0126] In some embodiments, at least one of the first housing 12 and the second housing 211 is made of aluminum alloy material. Aluminum alloy material has high strength and good wear resistance, which can effectively support and protect the display screen 11 and the 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 thickness of the electronic device 100, in other embodiments, a lower-density magnesium alloy 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 that of the aluminum alloy, thus ensuring the structural strength of the electronic device 100 while achieving a thinner and lighter design. However, magnesium alloys are chemically reactive and easily corroded in environments exposed to oxygen and water. Therefore, while achieving a thinner and lighter electronic device 100, this also presents new challenges to the process of fabricating the magnesium alloy to form the first housing 12 or the second housing 211.

[0128] Please see Figure 5 , Figure 5 This is a process flow diagram of a magnesium alloy processing method provided in some embodiments of this application. Figure 5 The processing method of this embodiment can prepare a magnesium alloy workpiece into a magnesium alloy component with a locally bright metallic luster. The magnesium alloy component can be used in an 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 the original magnesium alloy workpiece and perform grinding pretreatment on it;

[0130] S2. Chemical conversion or micro-arc oxidation is performed on the polished magnesium alloy workpiece to form a protective film.

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

[0132] S4. High-gloss surface is formed by high-gloss cutting of a specified area of ​​the magnesium alloy workpiece using CNC.

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

[0134] exist Figure 5 In the illustrated embodiment, step S1 can be performed using sandpaper or a grinder to polish the uneven areas of the magnesium alloy workpiece. In step S2, a protective film is formed on the surface of the magnesium alloy workpiece through micro-arc oxidation or chemical conversion, increasing its corrosion resistance. Then, in step S3, paint is applied to the surface to present a textured appearance and protect the magnesium alloy workpiece. Subsequently, according to different personalized requirements, CNC high-gloss processing is performed on designated locations of the magnesium alloy workpiece to cut away the paint layer and protective film, exposing the metal body and presenting a high-gloss surface of the magnesium alloy.

[0135] Because magnesium alloys are chemically reactive, magnesium alloy workpieces undergo rapid oxidation and fogging upon contact with air after CNC high-gloss machining, losing their high-gloss effect. Therefore, step S4 is required to polish the oxidized high-gloss surface. Specifically, a polishing wheel can be used to polish the high-gloss surface, increasing its brightness. However, due to limitations in the polishing process, while polishing can improve the brightness of the high-gloss surface, it can also cause new damage to the fogged surface, such as creating new grinding marks. This prevents the high-gloss surface from regaining its original metallic luster, resulting in a low yield rate.

[0136] To address the issue of low yield rates of magnesium alloy components due to easy corrosion of the high-gloss surface during magnesium alloy manufacturing, this application provides a processing method for magnesium alloy components. This processing method can simultaneously generate a protective layer (hereinafter referred to as the first transparent protective layer) on the high-gloss surface while performing CNC high-gloss cutting on the magnesium alloy. This achieves oxygen and air isolation, solves the problem of rapid oxidation and fogging of magnesium alloys after CNC high-gloss finishing, and eliminates the need for subsequent polishing processes.

[0137] Please see Figure 6 , Figure 6 This is a process flow diagram of a method for processing magnesium alloy components provided in some embodiments of this application. The preparation method includes the following steps:

[0138] S100, Provide a magnesium alloy workpiece;

[0139] S102. The first area of ​​the magnesium alloy workpiece is subjected to CNC high-gloss treatment to form a high-gloss surface. The cutting fluid used in the high-gloss CNC high-gloss treatment forms a first transparent protective layer on the outside of the high-gloss surface. The cutting fluid includes at least alkyl sulfonate (SAS, general formula RSO3Me) and surfactant.

[0140] Please see Figure 7 , Figure 7 The diagram below illustrates the structure of a magnesium alloy workpiece 200 according to some embodiments of this application. The magnesium alloy workpiece 200 has a first region 210, which refers to a location on the surface of the magnesium alloy workpiece 200 that requires special high gloss. A high-gloss logo can be formed in the first region 210, or a locally high-gloss surface can be formed in the first region 210 to achieve a unique metallic high gloss and improve 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. The specific location of the first region 210 is not limited in this application.

[0141] Please see Figure 8 , Figure 8 This is a schematic diagram of the structure of a magnesium alloy component 400 provided in some embodiments of this application. 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 outer shell of any electronic device 100, as described above. Figure 3 The first housing 12 in the embodiment, or Figure 4 The second housing 211 in the embodiment, etc.

[0142] Please refer to the following: Figures 7 to 8 Through CNC high-gloss processing, a high-gloss surface 200a is formed on the first region 210. During CNC high-gloss processing, cutting fluid is required at the cutting position of the CNC machine's cutting tool. The cutting fluid is used to cool and lubricate the cutting tool and to clean the cutting position. The lubricating effect of the cutting fluid during the cutting process reduces friction between the cutting tool and 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 removes generated chips, swarf, and powder, keeping the cutting tool sharp and preventing it from affecting the cutting effect. The cooling effect of the cutting fluid during the cutting process removes the heat generated by the cutting tool, preventing overheating of the cutting tool.

[0143] Furthermore, the cutting fluid in this embodiment not only performs the functions of a traditional cutting fluid but also provides protection for the high-gloss surface 200a. It provides real-time spraying of cutting fluid during cutting, allowing it to rapidly form a first transparent protective layer 320 on the outer side of the high-gloss surface 200a. This first transparent protective layer 320 is formed after the CNC high-gloss treatment is completed; that is, the high-gloss surface 200a and the first transparent protective layer 320 are formed simultaneously or sequentially within an acceptablely short timeframe. The first transparent protective layer 320 is dense and transparent, effectively isolating water and oxygen, preventing oxidation and fogging of the high-gloss surface 200a after cutting, and ensuring the metallic luster of the high-gloss surface 200a is visible.

[0144] Specifically, the cutting fluid includes at least alkyl sulfonates and surfactants. Surfactants, also known as surfactants, can reduce the surface tension of the cutting fluid and increase its wettability during the actual film formation process, allowing the cutting fluid to quickly wet and spread onto the surface of the magnesium alloy workpiece 200 and form a film. After being spread by the surfactant, the alkyl sulfonates are quickly adsorbed onto the surface of the magnesium alloy workpiece 200, thereby forming a first transparent protective layer 320 on the outer side of the high-gloss surface 200a to protect the high-gloss surface 200a.

[0145] Furthermore, since magnesium alloys are polar metals, when the cutting fluid comes into contact with the surface of the magnesium alloy workpiece 200, hydrogen bonding 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 onto the high-gloss surface 200a to form a first transparent protective layer 320 with good adhesion and a protective effect.

[0146] Thus, the processing method of the magnesium alloy component 400 provided in this application embodiment provides a cutting fluid that can form a first transparent protective layer 320 while performing high-gloss treatment on the magnesium alloy workpiece 200. At the same time as the cutting is completed, a protective layer is formed on the high-gloss surface 200a, preventing the high-gloss surface 200a from being easily corroded and losing its luster when exposed to oxygen and water. Furthermore, there is no need to polish the high-gloss surface 200a again, avoiding the situation where polishing causes new damage to the high-gloss surface 200a. This process produces a magnesium alloy component 400 with a better metallic high-gloss texture.

[0147] In addition to the processing method described above, the magnesium alloy component 400 in the above embodiments can also be prepared by other methods, as long as a high-gloss surface 200a is formed by superimposing a first transparent protective layer 320 containing alkyl sulfonate and surfactant. It is understood that the magnesium alloy component 400 in any of the embodiments below can also be prepared by the processing method of the magnesium alloy component 400 in the embodiments of this application or by other methods.

[0148] In some embodiments, the first transparent protective layer 320 can be a nano-protective film. The nano-protective film has a good density effect and can effectively isolate external oxygen and water, preventing oxygen and water from passing through the first transparent protective layer 320 and coming into contact with the glossy surface 200a.

[0149] In some embodiments, the surfactant can be anionic, nonionic, or cationic. For example, anionic surfactants can be fatty acid soaps (such as potassium fatty acid soaps) or petroleum sulfonates (C...). 23 H 38 SO3M or C 31 H 48 Nonionic surfactants can include sorbitol esters (C6H2O) such as SO3M, etc. 14 O6), polyether, etc., and cationic surfactants can be fatty acid alkylamides (RCON(CH2CH2OH)2), etc.

[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, sodium silicate can also act as a corrosion inhibitor, thereby improving the corrosion resistance of the first transparent protective layer.

[0151] Complexing agents, also known as complexing agents, can be, for example, one or more of disodium ethylenediaminetetraacetate (EDTA-2Na), disodium citric acid (C6H6Na2O7), and tartaric acid (C4H6O6). Complexing agents can form stable complexes with metal ions, thereby improving the adsorption effect of cutting fluid on the high-gloss surface 200a. At the same time, complexing agents can prevent the high-gloss surface 200a from undergoing oxidation with oxygen, thereby isolating the high-gloss surface 200a from oxygen.

[0152] Surfactants, alkyl sulfonates, a first alkaline solvent, and a complexing agent are added to water in a certain mass fraction to form the final cutting fluid. This makes the cutting fluid provided in this application embodiment not only have lubrication, cooling, and cleaning functions, but also have the function of sedimentation coating, forming a 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, mass fraction refers to the ratio of the mass of solute to the mass of solvent in a solvent, or the percentage of a certain substance in a mixture relative to the total mass. 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 instance, 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 surfactant, the reference fraction of the first alkaline solvent, and the mass fraction of complexing agent are all understood with reference to the mass fraction of alkyl sulfonate, and will not be elaborated further here. The mass fraction of surfactant can be less than or equal to 5%, for example, the mass fraction of surfactant in 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 cutting fluid can be 2%, 4%, 6%, 8%, 10%, etc. The mass fraction of complexing agent can be less than or equal to 5%, for example, the mass fraction of complexing agent in cutting fluid can be 1%, 2%, 3%, 4%, 5%, etc.

[0156] In some embodiments, after step S102 performs CNC high-gloss processing on the first region 210 of the high-gloss magnesium alloy workpiece 200 to form a high-gloss surface 200a, the method further includes:

[0157] S103. Provide a protective liquid to form a second transparent protective layer 330 on the outer side of the glossy surface 200a, wherein the protective liquid includes at least silane.

[0158] Please see Figure 9 , Figure 9 This is a schematic diagram of the structure of a magnesium alloy component 400 provided in other embodiments of this application. Through the action of a protective liquid, a second transparent protective layer 330 is superimposed on the outside of the high-gloss surface 200a. The second transparent protective layer 330 can maintain the high-gloss effect of the high-gloss surface 200a, prevent oxidation of the high-gloss surface 200a, and improve the adhesion between the subsequent coating layer and the magnesium alloy workpiece 200. That is, the second transparent protective layer 330 can not only effectively adhere to the surface of the high-gloss surface 200a, but also effectively adhere to other coating layers formed on its outer side.

[0159] Specifically, silane, also known as silane agent, is a general term for compounds of silicon and hydrogen, including but not limited to silane (SiH4), silane (Si2H6), etc. Silane can form a dense protective film, namely the second transparent protective layer 330, which effectively isolates oxygen and water, thereby improving the corrosion resistance of magnesium alloys. Furthermore, the adhesion between film layers on the high-gloss surface 200a of magnesium alloy components 400 treated with silane is also significantly improved.

[0160] In some embodiments, the protective fluid 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, and the pH value of the protective fluid can be 8-12. The complexing agent in the protective fluid can be the same type or different from the complexing agent in the cutting fluid, and the function of the complexing agent in the protective fluid is the same as its function in the cutting fluid. For details, please refer to the explanation of complexing agents in cutting fluids above, which will not be repeated here.

[0161] exist Figure 8 In the magnesium alloy component 400 provided in the illustrated embodiment, a first transparent protective layer 320 is formed on the surface of the high-gloss surface 200a simultaneously with its formation. However, if extreme circumstances exist that cause the first transparent protective layer 320 to not completely cover the high-gloss surface 200a, the high-gloss surface 200a may be locally oxidized and corroded, generating oxides. Therefore, through the protective liquid provided in step S103, during the formation of the second transparent protective layer 330, the sodium citrate in the protective liquid can remove trace amounts of oxides present on the surface of the high-gloss surface 200a, thereby restoring the metallic luster of the magnesium alloy workpiece 200 surface. The inhibitor can also be called a corrosion inhibitor. 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, thereby improving the corrosion resistance of the second transparent protective layer 330.

[0162] Silane, a complexing agent, a second alkaline solvent, sodium citrate, and an inhibitor are added to water in a specific mass fraction to form a final protective solution. This protective solution, provided in this embodiment, can generate a second transparent protective layer 330 to protect the high-gloss surface 200a while simultaneously improving the adhesion between film layers and removing trace oxides from the surface of the high-gloss surface 200a, thus ensuring the metallic luster of the high-gloss surface 200a. The thickness of the second transparent protective layer 330 can be designed according to actual conditions; for example, the thickness of the first transparent protective layer 320 is 0.5 micrometers (μm) to 3 μm.

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

[0164] In some embodiments, the second transparent protective layer 330 may also be a nano-protective film. The nano-protective film has a good density effect and can effectively isolate external oxygen and water, preventing oxygen and water from passing through the second transparent protective layer 330 and coming into contact with the glossy surface 200a.

[0165] See Figure 10 , Figure 10 Diagram illustrating the process of forming a second transparent protective layer 330 for the protective liquid:

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

[0167] Step 2: Wash with water. Specifically, the degreased magnesium alloy component 400 can be washed with clean water at least twice.

[0168] Step 3: Immerse in protective liquid. Specifically, the magnesium alloy component 400 after washing can be immersed in protective liquid. The immersion environment can be 50℃-60℃, and the immersion time can be 60s-120s. During the immersion process, the protective liquid adheres to the outer side of the high-gloss surface 200a, forming a second transparent protective layer 330.

[0169] Step 4, washing and drying: Specifically, after the second transparent protective layer 330 is formed, the magnesium alloy workpiece 200 is washed with clean water at least twice, and then baked to dehydrate and cure, forming a magnesium alloy component 400 containing the second transparent protective layer 330.

[0170] In some embodiments, see Figure 11 , Figure 11The specific process flow diagram for providing the protective liquid to form a second transparent protective layer 330 on the outer side of the high-gloss surface 200a includes step S103, which specifically includes:

[0171] S1031. Degrease the first region 210 to remove grease from the surface of the first transparent protective layer 320 and / or remove the first transparent protective layer 320.

[0172] S1032, Provide a protective liquid to immerse the first region 210 to form a second transparent protective layer 330 on the outer side of the glossy surface 200a.

[0173] Specifically, the degreasing environment for the first region 210 can be 40℃-60℃. The purpose is to remove oil stains, fingerprints, and other contaminants generated on the surface of the magnesium alloy workpiece 200 after step S102. In some embodiments, a shorter degreasing time can be used to remove grease from the surface of the first transparent protective layer 320, retaining the first transparent protective layer 320. In this way, in the subsequent step S1032, the second transparent protective layer 330 is formed on the first transparent protective layer 320. In other embodiments, a longer degreasing time can be used to remove the first transparent protective layer 320, naturally removing the grease. In this case, in the subsequent step S1032, the second transparent protective layer 330 is directly formed on the high-gloss surface 200a.

[0174] Understandably, the removal of the first transparent protective layer 320 is carried out during the formation of the second transparent protective layer 330. Therefore, after the removal of the first transparent protective layer 320, the glossy surface 200a will not come into contact with external oxygen and water, and will continue to be protected by the second transparent protective layer 330.

[0175] The formation of the second transparent protective layer 330 can provide dual protection for the glossy surface 200a together with the first transparent protective layer 320, or it can continue to protect the glossy surface 200a even after the first transparent protective layer 320 is removed. Whether the first transparent protective layer 320 is removed or not does not affect the high-gloss effect of the glossy surface 200a. In the following description, for ease of explanation, it will be assumed that the first transparent protective layer 320 is not removed, but this should not be construed as a limitation of this application.

[0176] In some embodiments, please refer to Figure 12 , Figure 12 This is a schematic diagram of the structure of a magnesium alloy component 400 provided in some embodiments of this application. After step S102, which involves CNC high-gloss processing of the first region 210 of the magnesium alloy workpiece 200 to form a high-gloss surface 200a, the following steps are also included:

[0177] S104. A transparent appearance layer 340 is formed on the outer side of the glossy surface 200a.

[0178] The transparent outer layer 340 is formed directly on the outside of the first transparent protective layer 320. That is, after step S102, step S104 is performed directly, providing double transparent protection for the glossy surface 200a through the first transparent layer and the transparent outer layer 340. Please refer to [link / reference]. Figure 13 , Figure 13 This is a schematic diagram of the structure of a magnesium alloy component 400 provided in some embodiments of this application. The transparent outer layer 340 is formed on the outside of the second transparent protective layer 330. That is, step S103 is performed after step S102, and step S104 is performed after step S103. The high-gloss surface 200a is formed with three layers of transparent protection through the first transparent protective layer 320, the second transparent protective layer 330 and the transparent outer layer 340.

[0179] In some embodiments, the transparent appearance layer 340 can be formed by transparent electrophoresis to maintain the continuous high brightness and high transparency of the glossy surface 200a. For example, a conventional acrylic resin system transparent cathodic electrophoretic paint can be used to deposit on the outer side of the glossy surface 200a of the first region 210 under the action of an electric field. The deposition environment is 80℃-100℃, the deposition time is 10min-15min, and then the temperature is raised to 150℃-170℃ for baking for 20min-30min to complete the curing of the transparent appearance layer 340. The thickness of the transparent appearance layer 340 formed by transparent electrophoresis can be 8μm-15μm. For example, the thickness of the transparent appearance layer 340 can be 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, etc.

[0180] In other embodiments, the transparent appearance layer 340 can also be formed by transparent spraying to maintain the continuous high gloss and high transparency effect of the high gloss surface 200a. The transparent spraying can be done by spraying or coating, applying a transparent coating to the surface of the high gloss surface 200a and baking to cure it on the surface. For example, the thickness of the transparent appearance layer 340 formed by transparent spraying can be 8μm-20μm. For example, the thickness of the transparent appearance layer 340 can be 8μm, 9μm, 10μm, 11μm, 12μm, 13μm, 14μm, 15μm, 16μm, 17μm, 18μm, 19μm, 20μm, etc.

[0181] In some other embodiments, the transparent protective layer may also take other forms, the specific forms of which are not limited herein. The transparent outer layer 340 provides multiple layers of protection for the glossy surface 200a.

[0182] In some embodiments, see Figure 14 , Figure 14This is a structural diagram showing the positional relationship between the chemical conversion layer 310 and the high-gloss surface 200a provided in some embodiments of this application. Before performing CNC high-gloss processing on the first region 210 of the magnesium alloy workpiece 200 in step S102, step S101 is also included: chemically converting the surface of the magnesium alloy workpiece 200 to form the chemical conversion layer 310.

[0183] The purpose of the chemical conversion layer 310 is to improve the corrosion resistance of the magnesium alloy workpiece 200 and to enhance 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., thereby forming a corrosion-resistant chemical conversion layer 310 through chemical conversion.

[0184] Except for the area where the high-gloss surface 200a is formed, the magnesium alloy component 400 is covered by the chemical conversion layer 310. Local high gloss is formed through step 102. At this time, the chemical conversion layer 310 on the surface of the high-gloss surface 200a is removed during the CNC process. The chemical conversion layer 310 in the other areas except the surface of the high-gloss surface 200a is retained on the magnesium alloy workpiece 200 to continue to provide protection.

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

[0186] In some of these embodiments, see Figure 15 and Figure 16 , Figure 15 This is a schematic diagram of the structure of a magnesium alloy workpiece 200 provided in one embodiment of this application. Figure 16 for Figure 15 The schematic diagram shown illustrates the stacked structure of a magnesium alloy component 400 with a textured composite layer 360 formed from a magnesium alloy workpiece 200. After forming the chemical conversion layer 310 in step S101, the following steps are also included:

[0187] S105. A textured composite layer 360 is formed in the second region 220 of the magnesium alloy workpiece 200.

[0188] See Figure 15 The magnesium alloy workpiece 200 has a first region 210 and a second region 220, which are located at different positions on the magnesium alloy workpiece 200. For example, the magnesium alloy assembly 400 formed from the magnesium alloy workpiece 200 can be configured as follows: Figure 3 The first housing 12 shown here has a first region 210 located on the second surface 1212 of the first housing 12, and a second region 220 located on the outer surface of the first frame 122 of the first housing 12.

[0189] The textured composite layer 360 can be formed on the chemical conversion layer 310. The textured composite layer 360 can form texture colors 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 component 400 that has both textured color and high-brightness metallic luster, thereby improving the metallic texture and aesthetics of the magnesium alloy component 400.

[0190] In some embodiments, please refer to Figure 17 , Figure 17 This is a schematic diagram of the stacked structure of a texture composite layer 360 and a chemical conversion layer 310 provided in some embodiments of this application. The texture composite layer 360 includes at least one texture layer for achieving lighting effects. Specifically, the texture composite layer 360 may include one texture layer, defined as a first texture layer 362, thereby forming a single texture effect.

[0191] Further, the textured composite layer 360 includes a primer layer 361 and a first textured layer 362. The formation process of the first textured layer 362 can be as follows: firstly, a specific adhesive is sprayed onto the surface of the primer layer 361 by means of spraying, screen printing, roller printing, or dip coating; then, a film with a textured structure is laminated; and finally, it is cured by light. The specific adhesive composition may include a prepolymer curing agent and additives. The prepolymer can be selected from one or more of polyurethane acrylic resin, polyester acrylic resin, and epoxy acrylate (EA). The process of forming the textured composite layer 360 in step S105 specifically includes:

[0192] S1051, A primer layer 361 is formed on the chemical conversion layer 310 in the second region 220;

[0193] S1052, A first texture layer 362 is formed on the primer layer 361.

[0194] The main 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 heat curing it. In some embodiments, the thickness of the primer layer 361 can be 10μm-50μm. For example, the thickness of the primer layer 361 can be 10μm, 20μm, 30μm, 40μm, 50μm, etc.

[0195] The paint components forming the primer layer 361 may include prepolymers, curing agents, thinners, and additives. The prepolymer component consists of modified acrylic resin and polyester acrylic resin, for example, 80% modified acrylic resin and 20% polyester acrylic resin. The curing agent, also known as a hardener, 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 an aliphatic amine, vinyltriamine (DETA), diaminocyclohexane (DACH), etc. The thinner, also known as paint thinner, is a liquid solvent with good miscibility with the resin added to reduce the resin viscosity and improve its processing performance. It can include both reactive and non-reactive thinners. Additives mainly include pigments and leveling aids. Leveling aids are divided into two main categories. One type works by adjusting the paint viscosity and leveling time. These leveling agents are generally high-boiling-point organic solvents or mixtures thereof, such as isophorone (C9H). 14 O), diacetone alcohol (C6H) 12 One type works by adjusting the surface properties of the paint, thereby achieving good leveling of the paint film. Furthermore, the mass fraction of additives, thinners, and hardeners can be 40% to 60%.

[0196] Thus, in Figure 17 In the embodiment shown, the chemical conversion layer 310 of the second region 220 of the final magnesium alloy component 400 exhibits a single texture effect with the primer layer 361 and the first texture layer 362 superimposed.

[0197] In other embodiments, the texture composite layer 360 may also include two texture layers. For example, one texture layer can form light and shadow colors, and the other texture layer can form a frosted texture, creating a dual effect of texture visual and tactile sensation. In some embodiments, a transition layer can be provided between the two texture layers to improve the adhesion between them. The texture composite layer 360 may also include three texture layers. For ease of explanation, the following description will focus on the texture composite layer 360 including two texture layers to illustrate the effect of the texture composite layer 360.

[0198] In some embodiments, please refer to Figure 18 , Figure 18This is a schematic diagram of the stacked structure of the textured composite layer 360 and the chemical conversion layer 310 provided in other embodiments of this application. Figure 18 In the embodiment of the texture composite layer 360 shown, the texture composite layer 360 includes a first texture layer 362, a second texture layer 367, and a first transition layer 364 located between the first texture layer 362 and the second texture layer 367. The purpose of the first transition layer 364 is to connect the two layers and achieve 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, A primer layer 361 is formed on the chemical conversion layer 310 in the second region 220;

[0200] S1052, A first texture layer 362 is formed on the primer layer 361;

[0201] S1053, A first transition layer 364 is formed on the first texture layer 362;

[0202] S1054, A second texture layer 367 is formed on the first transition layer 364.

[0203] Specifically, the main component of the first transition layer 364 can be any one or more 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 apply the first transition layer 364 material to the outside of the first textured layer 362 by spraying, screen printing or coating method, and then cure it to form the first transition layer 364. The thickness of the first transition layer 364 can be 5μm-10μm.

[0204] exist Figure 18 In the embodiment of the textured composite layer 360 shown, the chemical conversion layer 310 of the second region 220 of the final magnesium alloy component 400 exhibits a dual-texture effect with the superposition of the 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 located between the first texture layer 362 and the second texture layer 367. The main function of the gloss layer is to achieve metallic gloss and metallic light and shadow effects. Please refer to [link / reference]. Figure 19 , Figure 19This is a schematic diagram of the stacked structure of the texture composite layer 360 and the chemical conversion layer 310 provided in some embodiments of this application. In this embodiment, the gloss layer includes one layer, defined as the first gloss layer 363, and the texture composite layer 360 includes a primer layer 361, a first texture layer 362, a first gloss layer 363, and a second texture layer 367. The process of forming the texture composite layer 360 in step S105 specifically includes:

[0206] S1051, A primer layer 361 is formed on the chemical conversion layer 310 in the second region 220;

[0207] S1052, A first texture layer 362 is formed on the primer layer 361;

[0208] S1055, A first glossy layer 363 is formed on the first texture layer 362;

[0209] S1056. A first transition layer 364 is formed on the first glossy layer 363;

[0210] S1057, A second texture layer 367 is formed 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 onto the surface of the first texture layer 362 to achieve a better metallic luster effect. For example, the target material can be one or more of SiO, ZrO2, Ti3O5, SiO2, Ti3O5, SiO2, and Ti3O5. In some embodiments, the first gloss layer 363 can be a composite film layer, i.e., a film layer with a composite gloss effect is formed by multiple target materials. The thickness of the first gloss layer 363 can be specifically set according to appearance requirements. In some embodiments, the thickness of the first gloss layer 363 can be 100nm-500nm. For example, the thickness of the first gloss layer 363 can be 100μm, 150μm, 200μm, 300μm, 400μm, 500μm, etc.

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

[0213] The formation process of the second texture layer 367 can refer to the formation process of the first texture layer 362. Furthermore, to achieve different texture effects between the second texture layer 367 and the first texture layer 362, the texture structures of the films of the second texture layer 367 and the first texture layer 362 are different. For example, the film of the first texture layer 362 creates a light and shadow effect, while the film of the second texture layer 367 creates a frosted texture effect. The thickness of the first texture layer 362 and the thickness of the second texture layer 367 can be the same or different. In some embodiments, the thickness of both the first texture layer 362 and the second texture layer 367 satisfies 10μm-25μm. For example, the thickness of the first texture layer 362 can be 10μm, 15μm, 20μm, 25μm, etc., and the thickness of the second texture layer 367 can be 10μm, 15μm, 20μm, 25μm, etc.

[0214] exist Figure 19 In the embodiment shown, the chemical conversion layer 310 of the second region 220 of the final magnesium alloy component 400 exhibits a double-textured single-gloss coating effect with the superposition of primer layer 361, first gloss layer 363, first transition layer 364 and second texture layer 367.

[0215] In some embodiments, see Figure 20 , Figure 20 This is a schematic diagram of the stacked structure of the texture composite layer 360 and the chemical conversion layer 310 of the second region 220 provided in some embodiments of this application. The gloss layer includes two layers, namely a first gloss layer 363 and a second gloss layer 365, and the transition layer includes two layers, namely a first transition layer 364 and a second transition layer 366. In this case, the process of forming the texture composite layer 360 in step S105 specifically includes:

[0216] S1051, A primer layer 361 is formed on the chemical conversion layer 310 in the second region 220;

[0217] S1052, A first texture layer 362 is formed on the primer layer 361;

[0218] S1055, A first glossy layer 363 is formed on the first texture layer 362;

[0219] S1056. A first transition layer 364 is formed on the first glossy layer 363;

[0220] S1058, A second glossy layer 365 is formed on the first transition layer 364;

[0221] S1059. A second transition layer 366 is formed on the second gloss layer 365;

[0222] S1100, A second texture layer 367 is formed on the second transition layer 366.

[0223] The second gloss layer 365 serves the same purpose as the first gloss layer 363, and can be superimposed on the first gloss layer 363 to achieve a good metallic luster and metallic light and shadow effect. Similarly, the second transition layer 366 serves the same purpose as the first transition layer 364. By forming the second transition layer 366 on the second gloss layer 365, the second transition layer 366 transitions between the second gloss layer 365 and the second texture layer 367, improving the adhesion of the second texture layer 367.

[0224] The formation process of the second gloss layer 365 and the second transition layer 366 can be referenced to the formation process of the first gloss layer 363 and the first transition layer 364, as well as the formation process of the texture layer. Figure 20 In the embodiment shown, the chemical conversion layer 310 of the second region 220 of the final magnesium alloy component 400 exhibits a double-texture, double-gloss coating effect with the superposition of primer layer 361, first gloss layer 363, first transition layer 364, second gloss layer 365, second transition layer 366, and second texture layer 367.

[0225] In any of the above embodiments, the textured composite layer 360 does not require prior preparation; it can simply be formed sequentially on the chemical conversion layer 310 of the second region 220 according to the hierarchical structure. The preparation process is simple and can achieve a multi-textured coating effect through layer stacking. In other embodiments, the textured composite layer 360 can also be formed directly on the second region 220. That is, in this case, it is not necessary to form the chemical conversion layer 310 in the second region 220; the textured composite layer 360 of any of the above embodiments can be formed directly on the surface of the magnesium alloy workpiece 200 in the second region 220.

[0226] In the following text, a magnesium alloy component 400 is formed from a magnesium alloy workpiece 200 obtained by a processing method. Figure 1 Taking the outer casing of the electronic device 100 as an example, a magnesium alloy workpiece 200 can be first obtained through a casting process, see [reference]. 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 surrounding the back plate 230, the back plate 230 having a first surface 231 and a second surface 232 opposite to each other in its thickness direction.

[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. In this case, the first surface 1211 of the first back plate 121 constitutes the first surface 231, the second surface 1212 of the first back plate 121 constitutes the second surface 232, 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 housing 12 of the electronic device 100. Regarding the connection and setting position of the back plate 230 and the frame 240, please refer to the above description of the first back plate 121 and the first frame 122 of the first housing 12, which will not be repeated here.

[0228] In some embodiments, please continue reading Figure 21a , Figure 21a This is a schematic diagram of the structure of a first type of magnesium alloy component 400 formed from a magnesium alloy workpiece 200 having a back plate 230 and a frame 240. A second region 220 is formed on the back plate 230, and a first region 210 is formed at the connection between the back plate 230 and the frame 240. The magnesium alloy workpiece 200 can be processed by the processing method of the magnesium alloy component 400 in any embodiment of this application to form a high-gloss surface on the first region 210 and form a corresponding stacked structure (including but not limited to a first transparent protective layer 320, a second transparent protective layer 330, and a transparent appearance layer 340) to create a local high-gloss effect, and form a texture composite layer 360 on the second region 220 to create a dazzling texture effect.

[0229] In other embodiments, please continue to refer to Figure 21b , Figure 21b This is a schematic diagram of the structure of a second type of magnesium alloy component 400 formed from a magnesium alloy workpiece 200 having a back plate 230 and a frame 240. A second region 220 is formed on the back plate 230, and a first region 210 is formed at the connection between the back plate 230 and the frame 240 and on the surface of the frame 240. The magnesium alloy workpiece 200 can be processed by the processing method of the magnesium alloy component 400 in any embodiment of this application to form a high-gloss surface on the first region 210 and form a corresponding stacked structure (including but not limited to a first transparent protective layer 320, a second transparent protective layer 330, and a transparent appearance layer 340) to create a local high-gloss effect, and form a texture composite layer 360 on the second region 220 to create a dazzling texture effect.

[0230] In other embodiments, it may also be as described above. Figure 4The second back plate 211a shown constitutes the back plate 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 assembly 400 constitutes the second housing 211 of the electronic device 100. At this time, the first region 210 can be formed at the connection position between the second back plate 211a and the third frame 211c, or at the outer surface of the third frame 211c, or at the connection point between the third frame 211c and the panel 211b.

[0231] In other embodiments, see Figure 22 , Figure 22 This is a schematic diagram of the structure of an electronic device 100 provided in other embodiments of this application. When the electronic device 100 is a mobile phone, the magnesium alloy component 400 can also constitute the third housing 40 of the mobile phone. The third housing 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 away from the fourth frame 42. At this time, a second region 220 can be formed on the side of the third back plate 41 where the camera 411 is located. A first region 210 can be formed at the connection between the third back plate 41 and the fourth frame 42 or on the outer surface of the fourth frame 42, thereby forming a mobile phone with a large-area texture and local high-brightness 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, for Figure 21a or Figure 21b In the illustrated embodiment, the magnesium alloy workpiece 200, the connection between the back plate 230 and the frame 240 all form a first region 210. Step S102, which involves CNC high-gloss processing of the first region 210 of the magnesium alloy workpiece 200 to form a high-gloss surface, specifically includes:

[0233] S1021. CNC machining is performed on the connection between the second surface 232 and the frame 240 to form a chamfer;

[0234] S1022. The chamfer is subjected to CNC high-gloss processing to obtain a first high-gloss surface 210a. The cutting fluid used during the CNC high-gloss processing forms a first transparent protective layer 320 on the outside of the first high-gloss surface 210a.

[0235] Through steps S1021 and S1022, local highlights can be formed at the chamfered location. Specifically, in step S1021, a chamfer is formed by CNC cutting at the connection between the second surface 232 and the frame 240. That is, a chamfer is formed by cutting on the outer surface of the magnesium alloy workpiece 200. For example, the chamfer can be a C-angle or a Radius angle. A C-angle is a Chamfer angle, which 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. A Radius angle is a Radius angle (e.g., ...). Figure 21a and Figure 21b The image shows the radius (R-angle), which refers to the transition arc at the intersection of two planes. At this point, the connection between the second surface 232 and the outer surface of the frame 240 forms an arc-shaped connecting surface. After forming the chamfer, CNC highlighting is performed on the chamfered surface in step S1022 to obtain the first glossy 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 glossy surface 210a.

[0236] In some embodiments, Figure 21a In the illustrated embodiment, only the chamfer at the junction of the second surface 232 and the frame 240 is highlighted, while the surface of the frame 240 is not highlighted. Therefore, before step S1021, the following steps are also included:

[0237] S1023. An opaque appearance layer 350 is formed on the surface of the border 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 plate 230 is then highlighted. In this way, when the chamfer is formed by cutting, not only can the accumulated paint or excess glue on the edge of the frame 240 be removed, but the processing step of the first gloss surface 210a is also placed at the end of the entire highlighting process to avoid damage to the first gloss surface 210a during other processing and to avoid affecting the highlighting effect of the first gloss surface 210a.

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

[0240] Please see Figure 23 , Figure 23 for Figure 21aThe diagram shows a partial fabrication process of the magnesium alloy component 400:

[0241] A1: A magnesium alloy workpiece 200 is provided, wherein the second surface 232 and the frame 240 are connected at a right angle.

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

[0243] A3: An opaque appearance layer 350 is formed on the surface of the border 240 by step S1023;

[0244] A4: In step S1021, a chamfer is formed at the connection between the second surface 232 and the frame 240 by CNC cutting. Then, in step S1021, a CNC highlighting process is performed on the chamfered surface to obtain the first glossy surface 210a. At this time, the chemical conversion layer 310 and the opaque appearance layer 350 at the chamfer location are removed, and simultaneously, a first transparent protective layer 320 is formed on the first glossy surface 210a. For ease of explanation, in... Figure 23 The diagram shows the first glossy surface 210a and the first transparent protective layer 320, but this does not mean that the formation of the first glossy surface 210a and the formation of the first transparent protective layer 320 have a sequential order.

[0245] A5: 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, etc.) to provide transparent protection for the first high-gloss surface 210a, and finally a magnesium alloy component 400 is formed in the first region 210 with the first high-gloss surface 210a superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340.

[0246] In some embodiments, Figure 21b In the illustrated embodiment, the highlight surface 200a includes a first highlight surface 210a and a second highlight surface 210b. Specifically, step S1022 includes:

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

[0248] Step S10221 allows for the simultaneous creation of localized highlights at the chamfered edges and on the surface of the border 240. For details, please refer to [link / reference]. Figure 24 , Figure 24 for Figure 21b The diagram shows a partial fabrication process of the magnesium alloy component 400:

[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: A chemical conversion layer 310 is formed on the surface of the magnesium alloy workpiece 200 through step S101;

[0251] A3: In step S1021, a chamfer is formed at the connection between the second surface 232 and the frame 240 by CNC cutting. In step S10221, a CNC high-gloss treatment is performed on the surfaces of the chamfer and the frame 240 to obtain a first high-gloss surface 210a and a second high-gloss surface 210b. At this time, a chemical conversion layer 310 is formed on the chamfer and the frame 240. Simultaneously, a first transparent protective layer 320 is formed on both the first high-gloss surface 210a and the second high-gloss surface 210b. Similarly, for ease of explanation, Figure 21 also uses two figures to show the first high-gloss surface 210a, the second high-gloss surface 210b, and the first transparent protective layer 320, but this does not mean that the formation of the first high-gloss surface 210a, the second high-gloss surface 210b, and the first transparent protective layer 320 has a specific order.

[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.) to provide transparent protection for the first high-gloss surface 210a and the second high-gloss surface 210b. Finally, a magnesium alloy component 400 is formed in the first region 210 with the first high-gloss surface 210a 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 superimposed with the first transparent protective layer 320, the second transparent protective layer 330 and the transparent appearance layer 340.

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

[0254] In other embodiments, CNC highlighting can also be performed on the surface of the frame 240 alone. That is, only the surface of the frame 240 will have a highlighting effect, while the chamfered corners will not have a highlighting effect. The specific process can be referred to the description of any of the above embodiments, and will not be repeated here.

[0255] In some embodiments, please refer to Figure 21a and Figure 21b The second region 220 is the second surface 232 of the back panel 230. Thus, when the magnesium alloy component 400 constitutes the outer shell of the electronic device 100 (such as the first shell 12 or the third shell 40), the side of the outer shell presents a high-gloss effect, and the upper surface of the outer shell forms a composite texture effect, thereby providing an electronic device 100 with a refined appearance with a large surface of dazzling texture and local high-gloss metallic luster, enhancing the texture and metallic feel of the electronic device 100.

[0256] In some embodiments, step S105 of forming the textured composite layer 360 is performed before step S102 of performing CNC highlighting on the first region 210 of the magnesium alloy workpiece 200. That is, in any of the above embodiments of this application, the preparation process of the textured composite layer 360 of the second region 220 is performed before the CNC highlighting on the first region 210.

[0257] Please see Figure 25 , Figure 25 for Figure 21a The manufacturing process diagram of the magnesium alloy component 400 shown is as follows:

[0258] A1: A magnesium alloy workpiece 200 is provided, wherein the second surface 232 and the frame 240 are connected at a right angle.

[0259] A2: A chemical conversion layer 310 is formed on the surface of the magnesium alloy workpiece 200 through step S101;

[0260] A3: A textured composite layer 360 is formed on the second surface 232 through step S105;

[0261] A4: An opaque appearance layer 350 is formed on the surface of the border 240 by step S1023;

[0262] A5: In step S1021, a chamfer is formed at the connection between the second surface 232 and the frame 240 by CNC cutting. In step S1021, a CNC high-gloss treatment is performed on the chamfered surface to obtain the first high-gloss surface 210a. At this time, the chemical conversion layer 310, texture composite layer 360 and opaque appearance layer 350 at the chamfer position are removed, and a first transparent protective layer 320 is formed on the first high-gloss surface 210a.

[0263] A6: 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.) to provide transparent protection for the first glossy surface 210a.

[0264] Thus, a magnesium alloy component 400 is formed by superimposing a first transparent protective layer 320, a second transparent protective layer 330, and a transparent appearance layer 340 on a first high-gloss surface 210a in the first region 210, and superimposing a textured composite layer 360 on a second surface 232 in the second region 220, thereby achieving the appearance effect of large-area dazzling texture and local high-gloss superposition of the magnesium alloy component 400.

[0265] Please see Figure 26 , Figure 26 for Figure 21b The manufacturing process diagram of the magnesium alloy component 400 shown is as follows:

[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: A chemical conversion layer 310 is formed on the surface of the magnesium alloy workpiece 200 through step S101;

[0268] A3: A textured composite layer 360 is formed on the second surface 232 through step S105;

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

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

[0271] Thus, a magnesium alloy component 400 is formed in the first region 210, where a first high-gloss surface 210a is superimposed with a first transparent protective layer 320, a second transparent protective layer 330, and a transparent appearance layer 340; a second high-gloss surface 210b 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 region 220 is superimposed with a texture composite layer 360, achieving an appearance effect of large-area dazzling texture and local high-gloss superposition.

[0272] exist Figure 25 and Figure 26 In the illustrated embodiment, the preparation of the second surface 232 of the backplate 230 can precede the preparation of the first region 210. Thus, when the backplate 230 is chamfered, not only can the accumulated paint or excess adhesive on the edge of the second surface 232 be removed, but the processing steps of the first high-gloss surface 210a and the second high-gloss surface 210b are also placed at the end of the entire high-gloss processing method. This avoids damage to the first high-gloss surface 210a and the second high-gloss surface 210b when the texture composite layer 360 is coated on the second surface 232 of the backplate 230, thus affecting the high-gloss effect of the first high-gloss surface 210a and the second high-gloss surface 210b.

[0273] This application also provides a magnesium alloy component 400 as described in any of the embodiments. The magnesium alloy component 400 in this embodiment can be prepared by the processing method of the magnesium alloy component in any of the above embodiments, or by other methods; this application does not impose any limitations on this. The magnesium alloy component 400 can be used as the outer casing of the electronic device 100, such as the first casing 12, the second casing 211, the third casing 40, etc., and can also be used to prepare other structures.

[0274] This application also provides a cutting fluid and a protective liquid as described in any of the above embodiments. By using the cutting fluid and protective liquid in the processing method of the magnesium alloy component 400 in any of the above embodiments, corrosion and oxidation of the magnesium alloy workpiece 200 are prevented during the preparation of the magnesium alloy component 400, thereby obtaining a corrosion-resistant magnesium alloy component 400 with a localized high-gloss effect. Furthermore, the magnesium alloy component 400 in any embodiment of this application can simultaneously possess a dual composite effect of large-area dazzling texture and localized high gloss, 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 any suitable manner in 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 this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A method for processing a magnesium alloy component, characterized in that, include: Provide a magnesium alloy workpiece; The first region of the magnesium alloy workpiece is subjected to CNC high-gloss treatment to form a high-gloss surface; In the CNC high-gloss process, the cutting fluid used forms a first transparent protective layer on the outer side of the high-gloss surface. The cutting fluid includes at least alkyl sulfonates and surfactants, and the magnesium alloy workpiece can generate hydrogen bonding forces with the alkyl sulfonates.

2. The processing method for magnesium alloy components according to claim 1, characterized in that, The cutting fluid also includes a first alkaline solvent, a complexing agent, and water.

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

4. The processing method of the magnesium alloy component according to claim 1, characterized in that, After the step of performing CNC high-gloss treatment on the first region of the magnesium alloy workpiece to form a high-gloss surface, the method further includes: A protective liquid is provided to form a second transparent protective layer on the outer side of the high-gloss surface, the protective liquid comprising at least silane.

5. The processing method of the magnesium alloy component according to claim 4, characterized in that, The protective liquid also includes a complexing agent, a second alkaline solvent, sodium citrate, an inhibitor, and water.

6. The processing method of the magnesium alloy component according to claim 4, 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 processing method of the magnesium alloy component according to claim 4, 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: The first area is degreased to remove grease from the surface of the first transparent protective layer and / or remove the first transparent protective layer. The protective liquid is applied to immerse the first area to form a second transparent protective layer on the outer side of the glossy surface.

8. The processing method of the magnesium alloy component according to claim 1, characterized in that, After the step of performing CNC high-gloss treatment on the first region of the magnesium alloy workpiece to form a high-gloss surface, the method further includes: A transparent outer layer is formed on the outer side of the glossy surface.

9. The processing method of the magnesium alloy component according to claim 8, characterized in that, 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 spraying.

10. The processing method of the magnesium alloy component according to claim 1, 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 its thickness direction. The frame surrounds the back plate. The high-gloss surface includes a first high-gloss surface. The step of performing CNC high-gloss processing on a first region of the magnesium alloy workpiece to form a high-gloss surface includes: A chamfer is formed at the junction of the second surface and the frame by CNC machining. The chamfer is then subjected to CNC highlighting to obtain the first glossy surface.

11. The processing method of the magnesium alloy component according to claim 10, characterized in that, Before the step of CNC machining to form a chamfer at the junction of the second surface and the frame, the method further includes: An opaque appearance layer is formed on the surface of the border.

12. The processing method of the magnesium alloy component according to claim 10, characterized in that, The high-gloss surface includes a second high-gloss surface, and the step of performing CNC high-gloss processing on the first region of the magnesium alloy workpiece further includes: The second glossy surface is obtained by performing CNC highlighting on the surface of the frame.

13. The processing method of the magnesium alloy component according to claim 1, characterized in that, Prior to the step of performing CNC high-gloss finishing on the first region of the magnesium alloy workpiece, the following steps are also included: A chemical conversion layer is formed on the surface of the magnesium alloy workpiece by chemical conversion.

14. The processing method of the magnesium alloy component according to claim 13, characterized in that, The step of forming a chemical conversion layer on the surface of the magnesium alloy workpiece by chemical conversion further includes: A textured composite layer is formed in a second region of the magnesium alloy workpiece, the textured composite layer comprising at least one textured layer.

15. The processing method of the magnesium alloy component according to claim 14, characterized in that, The texture composite layer includes a first texture layer and a second texture layer, as well as at least one gloss layer located between the first texture layer and the second texture layer.

16. The processing method of the magnesium alloy component according to claim 14, 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 its thickness direction. The frame surrounds the back plate, and the second surface forms the second region.

17. The processing method of the magnesium alloy component according to claim 14, characterized in that, The step of forming a textured composite layer in the second region of the magnesium alloy workpiece is performed before the step of performing CNC high-gloss processing on the first region of the magnesium alloy workpiece.

18. A cutting fluid, characterized in that, The cutting fluid comprises an alkyl sulfonate, a first alkaline solvent, a surfactant, a complexing agent, and water, wherein the alkyl sulfonate is capable of forming hydrogen bonds with the magnesium alloy.

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 magnesium alloy component, characterized in that, include: Magnesium alloy workpiece, the magnesium alloy workpiece having a first region having a high-gloss surface: The magnesium alloy assembly further includes a first transparent protective layer disposed in the first region. The first transparent protective layer comprises at least alkyl sulfonate and surfactant, and the magnesium alloy workpiece is capable of generating hydrogen bonding forces with the alkyl sulfonate.

21. The magnesium alloy component according to claim 20, characterized in that, The magnesium alloy assembly further includes a second transparent protective layer disposed outside the first transparent protective layer, the second transparent protective layer comprising at least silane.

22. The magnesium alloy component according to claim 21, 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.

23. The magnesium alloy component according to claim 20, characterized in that, The magnesium alloy workpiece has a second region, and the magnesium alloy assembly 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.

24. The magnesium alloy component according to claim 23, 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 its thickness direction. The frame surrounds the back plate. The second surface forms a second region. A chamfer is formed at the connection between the frame and the second surface. The chamfered surface and / or the surface of the frame form the high-gloss surface.

25. An electronic device, characterized in that, It includes a first housing, which is prepared by the processing method of the magnesium alloy component according to any one of claims 1-17; And / or, the first housing comprises the magnesium alloy component as described in any one of claims 20-24.

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