Metallic component and method of manufacturing thereof, device

Abstract

The application discloses a metal assembly and a preparation method and equipment thereof, and belongs to the technical field of metal corrosion prevention. The metal assembly comprises a plurality of metal pieces, a first metal piece and a second metal piece with different electrode potentials, an insulating isolation layer between the first metal piece and the second metal piece, and a composite protective layer comprising an anti-corrosion layer on the surface of the first metal piece and / or the second metal piece and a paint layer on the surface of the anti-corrosion layer. Compared with the prior art, the application mainly cuts off the electron path of electrochemical corrosion by arranging the insulating isolation layer between the plurality of metal pieces with different electrode potentials, and cuts off the ion path of electrochemical corrosion by cooperating the anti-corrosion layer and the paint layer, so that the salt spray corrosion resistance of the metal assembly is significantly improved.

Description

Technical Field

[0001] This application relates to the field of metal corrosion protection technology, specifically to a metal component and its preparation method and equipment. Background Technology

[0002] Metal components, serving as fundamental structural elements in devices such as smart glasses, foldable phones, head-mounted displays, smartwatches, consumer electronics housings, and lightweight automotive structures, often require the simultaneous use of lightweight metals like magnesium / aluminum alloys and high-strength or high-stability metals like stainless steel / nickel / carbon steel. For example, lightweight metals are used for frames, mid-frames, housings, or skeletons, while stainless steel hinges, FPC reinforcing steel sheets, carbon steel screws, grounding springs, or shielding covers serve as connection / reinforcement / fastening / grounding structures. However, the salt spray corrosion resistance of existing metal components needs further improvement to meet the requirements for long-term reliable and safe use of these devices.

[0003] It should be noted that the above statements are only used to provide background information related to this application and do not necessarily constitute prior art. Summary of the Invention

[0004] In a first aspect, this application proposes a metal component comprising: Multiple metal components, including a first metal component and a second metal component with different electrode potentials; An insulating layer is located between the first metal component and the second metal component; and The composite protective layer includes an anti-corrosion layer on the surface of the first metal part and / or the second metal part and a paint layer on the surface of the anti-corrosion layer.

[0005] Compared with the prior art, the metal components provided in this application mainly improve the salt spray corrosion resistance of the metal components by setting an insulating isolation layer between multi-metal components with different electrode potentials to cut off the electronic path of electrochemical corrosion, and at the same time, by combining the anti-corrosion layer and the paint layer to cut off the ion path of electrochemical corrosion.

[0006] In some embodiments, the thickness of the insulating layer is 0.05mm-0.1mm; And / or, the insulating layer includes at least one of an insulating coating, an insulating gasket, and an insulating adhesive.

[0007] In some embodiments, the thickness of the anti-corrosion layer is 10μm-20μm.

[0008] In some embodiments, the anti-corrosion layer includes at least one of a micro-arc oxidation ceramic layer, a chemical conversion film layer, and an electrophoretic coating.

[0009] In some embodiments, the micro-arc oxidation ceramic layer comprises the following raw materials: Na2SiO3 3g / L-7g / L, KF 6g / L-10g / L, KOH 9g / L-13g / L; Alternatively, the raw material system of the chemical conversion film may include chromate system solutions or titanium-zirconium system solutions; Alternatively, the electrophoretic coating comprises the following raw materials in weight fractions: 10wt%-14wt% pigment, 30wt%-42wt% film-forming emulsion, 1wt%-3wt% additives, and the balance being water; wherein the additives include leveling agents, defoamers, cosolvents, neutralizers, and catalysts.

[0010] In some embodiments, the thickness of the paint layer is ≥28μm; And / or, the paint layer comprises the following raw materials: anti-corrosion paint, curing agent and thinner, wherein the weight ratio of the anti-corrosion paint, the curing agent and the thinner is 100:(5-15):(20-100).

[0011] In a second aspect of this application, a method for preparing the metal component described in the first aspect is provided, comprising the following steps: An insulating layer is provided between a first metal component and a second metal component with different electrode potentials; A composite protective layer is formed on the surface of the first metal part and / or the second metal part.

[0012] This application provides a method for preparing a metal component. On one hand, by setting an insulating layer between metal parts with different electrode potentials, this application avoids direct or indirect contact between different metals, thereby blocking the electronic circuit of electrochemical corrosion. On the other hand, by forming a composite protective layer on the surface of the metal parts, this application avoids the presence of a continuous electrolyte film (salt spray, sweat, etc.) on the surface of the metal parts, thereby cutting off the ion pathway of electrochemical corrosion. The two methods work synergistically to completely solve the problem of salt spray corrosion in metal components, resulting in a metal component with excellent resistance to salt spray corrosion.

[0013] In some embodiments, the step of forming a composite protective layer on the surface of the first metal member and / or the second metal member includes the following process: An anti-corrosion layer is formed on the surface of the first metal part and / or the second metal part using a micro-arc oxidation process; A paint layer is formed on the surface of the anti-corrosion layer using a spraying process; The operating conditions of the micro-arc oxidation process include: voltage 215V-225V, time 3min-6min, pH 5-6. The spraying process includes single-stage spraying, two-stage spraying, and three-stage spraying; The curing steps in the first-stage spraying and the second-stage spraying each independently include the following stages: First preheating stage: temperature 40℃-60℃; First leveling stage: temperature 65℃-75℃; First baking stage: temperature 75℃-85℃; The curing step in the three-stage spraying process includes the following stages: Second preheating stage: temperature 40℃-60℃; Second leveling stage: temperature 45℃-55℃; Second baking stage: temperature 45℃-55℃.

[0014] In a third aspect of this application, a device is proposed, comprising the metal component described in the first aspect or a metal component manufactured using the method described in the second aspect; the device includes a wearable electronic device, which includes smart glasses. Thus, this device possesses all the features and advantages of the aforementioned metal component and the aforementioned method for manufacturing the metal component, which will not be repeated here.

[0015] In some embodiments, the metal components in the smart glasses include at least one of a frame, a hinge, and a reinforcing steel sheet; And / or, the grounding area in the smart glasses is located on the inner sidewall of the frame; And / or, the contact area of ​​the reinforcing steel sheet in the smart glasses is not laser-engraved.

[0016] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0017] The foregoing aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of a method for preparing a metal component according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the contact area of ​​the reinforcing steel sheet in the smart glasses according to one embodiment of this application, without laser engraving and retaining the insulating pad.

[0019] Figure 3 This is a schematic diagram of the conventional electrical connection grounding location in the smart glasses according to one embodiment of this application, and the electrical connection grounding location of this application.

[0020] Explanation of reference numerals in the attached figures: Figure 2 and Figure 3In the middle: 1-Insulating gasket; 2-Laser engraving removed from the end face of the screw post; 3-Conventional electrical connection grounding position (screw post); 4-Electrical connection grounding position of this application (inner side wall of the frame). Detailed Implementation

[0021] The embodiments of this application are described in detail below, with examples of these embodiments shown in the accompanying drawings. However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repetitive descriptions of practically identical structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand this application and are not intended to limit the subject matter of the claims.

[0022] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application; unless otherwise stated, the values ​​of the parameters mentioned in this application can be measured using various measurement methods commonly used in the art.

[0023] The terms “comprising” and “having”, and any variations thereof, in the specification and claims of this application are open-ended expressions, meaning they include what is specified in this application but do not exclude other aspects.

[0024] In the description of this application, all figures disclosed herein, whether or not the words "approximately" or "about" are used, are approximate values. Each figure may vary by less than 10% or by a difference that is considered reasonable by one of the art, such as 1%, 2%, 3%, 4%, or 5%.

[0025] The "range" disclosed in this application is defined by a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of a particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for a specific parameter, it is expected that ranges of 60-110 and 80-120 are also included. Furthermore, if minimum range values ​​of 1 and 2 are listed, and if maximum range values ​​of 3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this application, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0026] In the description of this application, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. "First feature" and "second feature" may include one or more of that feature.

[0027] In the description of this application, "multiple" or "more" means two or more.

[0028] In the description of this application, "A and / or B" can include any of the cases of A alone, B alone, or A and B, where A and B are merely examples and can be any technical feature connected by "and / or" in this application.

[0029] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0030] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0031] The salt spray corrosion resistance of existing metal components needs further improvement. Specifically, existing metal components are usually made of different metal materials, and there are differences in the standard electrode potentials between different metals. In salt spray, humid, or sweaty environments, when two different metals (such as an aluminum alloy frame and a stainless steel hinge / FPC reinforcement) come into direct or indirect contact, a "corrosion cell" will be formed due to the difference in their standard electrode potentials, resulting in electrochemical corrosion: the metal with the more negative potential (such as aluminum alloy) becomes the anode and undergoes an oxidation reaction (dissolution corrosion); the metal with the more positive potential (such as stainless steel) becomes the cathode and undergoes a reduction reaction (hydrogen evolution or oxygen absorption).

[0032] This application addresses the problem of electrochemical corrosion in existing metal components by simultaneously interrupting both the electronic and ionic pathways involved in the process. Specifically, on one hand, this application establishes an insulating layer between metal components at different electrode potentials to prevent direct or indirect contact between different metals, thereby blocking the electronic circuit for electrochemical corrosion. On the other hand, this application forms a composite protective layer on the surface of the metal components to prevent the presence of a continuous electrolyte film (salt spray, sweat, etc.) on the surface, thus interrupting the ionic pathway for electrochemical corrosion. These two methods work synergistically to completely solve the problem of salt spray corrosion in metal components, resulting in a metal component with excellent resistance to salt spray corrosion.

[0033] In a first aspect, this application proposes a metal component comprising: Multiple metal components, including a first metal component and a second metal component with different electrode potentials; An insulating layer is located between the first metal component and the second metal component; and The composite protective layer includes an anti-corrosion layer on the surface of the first metal part and / or the second metal part and a paint layer on the surface of the anti-corrosion layer.

[0034] Compared with the prior art, the metal components provided in this application mainly improve the salt spray corrosion resistance of the metal components by setting an insulating isolation layer between multi-metal components with different electrode potentials to cut off the electronic path of electrochemical corrosion, and at the same time, by combining the anti-corrosion layer and the paint layer to cut off the ion path of electrochemical corrosion.

[0035] In this application, metal parts are generally understood as functional structural units mainly composed of metal materials, including single-type metal structural parts that are independently formed from a single metal material and can achieve their functions without the need for cooperation with other metals, and composite metal fittings (or metal kits) assembled from two or more different metal materials. In addition, the number of metal parts in the metal assembly can be 2, 3, 4, 5, etc.

[0036] In some embodiments, the thickness of the insulating layer is 0.05mm-0.1mm, for example, it can be 0.05mm, 0.07mm, 0.08mm, 0.1mm or any of the aforementioned values. Therefore, by controlling the thickness of the insulating layer within the aforementioned range, this application achieves both the function of cutting off the electronic pathway and the stability and mechanical properties of the connection between different metal components.

[0037] In some embodiments, the insulating layer includes at least one of an insulating coating, an insulating gasket, and an insulating adhesive, specifically an insulating gasket made of insulating materials such as PET (polyethylene terephthalate) or PI (polyimide). This effectively cuts off the electronic pathway for electrochemical corrosion of the metal component.

[0038] In some embodiments, the thickness of the anti-corrosion layer is 10μm-20μm, for example, it can be 10μm, 12μm, 15μm, 20μm or any range between the aforementioned values. Therefore, by controlling the thickness of the anti-corrosion layer within the aforementioned range, this application facilitates further improvement in the corrosion resistance of the metal components and the overall mechanical stability of the metal components.

[0039] In some embodiments, the anti-corrosion layer includes at least one of a micro-arc oxidation ceramic layer, a chemical conversion film layer, and an electrophoretic coating layer. In this application, the micro-arc oxidation ceramic layer can be used alone as the anti-corrosion layer, or the chemical conversion film layer and the electrophoretic coating layer can be sequentially stacked and composited as the anti-corrosion layer, etc.

[0040] In this application, the micro-arc oxidation ceramic layer can generally be understood as a ceramic oxide film layer grown in situ on the surface of a metal part using a micro-arc oxidation process. It utilizes the plasma micro-arc discharge effect, using a high-voltage pulse or direct current in an electrolyte to generate a micro-area arc discharge on the metal surface, with instantaneous temperatures reaching thousands of degrees Celsius, causing the base metal to react with oxygen in the electrolyte to form a ceramic layer mainly composed of base metal oxides.

[0041] In this application, a chemical conversion film can generally be understood as a compound thin film layer with strong adhesion and good chemical stability generated by chemical or electrochemical reactions that cause a specific component in the treatment solution to react with the metal surface.

[0042] In this application, electrophoretic coating can generally be understood as a uniform coating layer formed by using an electric field to cause charged coating particles (resin, pigment, etc.) to migrate directionally in an electrolyte and deposit on the surface of the object to be coated.

[0043] In some embodiments, the micro-arc oxidation ceramic layer comprises the following raw materials: Na₂SiO₃ 3g / L-7g / L (e.g., 3g / L, 5g / L, 7g / L, etc.), KF 6g / L-10g / L (e.g., 6g / L, 8g / L, 10g / L, etc.), and KOH 9g / L-13g / L (e.g., 9g / L, 11g / L, 13g / L, etc.). Thus, a micro-arc oxidation ceramic layer is formed on the surface of the metal part as an anti-corrosion layer, achieving surface strengthening treatment of the metal part and improving its corrosion resistance threshold.

[0044] In some embodiments, the raw material system of the chemical conversion film includes a chromate system solution and a titanium-zirconium system solution. Specifically, existing chromate system solutions (including the following components: sodium dichromate: 120g / L-180g / L, CaF2: 1g / L-3g / L, etc.) and existing titanium-zirconium system solutions (including the following components: H2TiF6: 2.5g / L-3.0g / L, H2ZrF6: 4.5g / L-5.5g / L, HF: 4.5g / L-5.5g / L, etc.) can be used.

[0045] In some embodiments, the electrophoretic coating comprises the following raw materials: 10wt%-14wt% color paste (e.g., 10wt%, 12wt%, 13wt%, 14wt%, etc.), 30wt%-42wt% film-forming emulsion (e.g., 30wt%, 33wt%, 35wt%, 42wt%, etc.), 1wt%-3wt% additives (e.g., 1wt%, 1.3wt%, 1.5wt%, 3wt%, etc.), with the balance being water; wherein the additives include at least one of leveling agent (polyoxyethylene sec-octylphenol ether, polyether-modified silicone), defoamer (polyoxyethylene sec-octylphenol ether), cosolvent / solvent, neutralizing agent / acid, and catalyst (dibutyltin oxide); wherein the color paste can be a commercially available product such as product model PD8000 black paste, and the film-forming emulsion can be a commercially available product such as product model PD8000 emulsion.

[0046] In some embodiments, the thickness of the paint layer is ≥28μm, for example, it can be 28μm, 30μm, 35μm, 45μm, 55μm, 65μm, or any range between the aforementioned values. Therefore, by providing a relatively thick paint layer on the surface of the anti-corrosion layer, this application can avoid corrosion initiation points caused by excessively thin local film thickness.

[0047] In some embodiments, the paint layer comprises the following raw materials: anti-corrosion paint, curing agent, and thinner, wherein the weight ratio of the anti-corrosion paint, the curing agent, and the thinner is 100:(5-15):(20-100), for example, 100:11:50, 100:13:50, 100:13:70, 100:10:87, etc. This forms a paint layer that further improves the durability of the metal component surface in a salt spray environment. Furthermore, the anti-corrosion paint can be a commercially available product such as a three- or four-coat system like Viagra.

[0048] In a second aspect of this application, a method for preparing the metal component described in the first aspect is provided, such as... Figure 1 As shown, it includes the following steps: An insulating layer is provided between a first metal component and a second metal component with different electrode potentials; A composite protective layer is formed on the surface of the first metal part and / or the second metal part.

[0049] This application provides a method for preparing a metal component. On one hand, by setting an insulating layer between metal parts with different electrode potentials, this application avoids direct or indirect contact between different metals, thereby blocking the electronic circuit of electrochemical corrosion. On the other hand, by forming a composite protective layer on the surface of the metal parts, this application avoids the presence of a continuous electrolyte film (salt spray, sweat, etc.) on the surface of the metal parts, thereby cutting off the ion pathway of electrochemical corrosion. The two methods work synergistically to completely solve the problem of salt spray corrosion in metal components, resulting in a metal component with excellent resistance to salt spray corrosion.

[0050] In some embodiments, the step of forming a composite protective layer on the surface of the first metal member and / or the second metal member includes the following process: An anti-corrosion layer is formed on the surface of the first metal part and / or the second metal part using a micro-arc oxidation process; A paint layer is formed on the surface of the anti-corrosion layer using a spraying process; The operating conditions of the micro-arc oxidation process include: voltage 215V-225V, for example, 220V; time 3min-6min, for example, 3min, 4min, 5min, 6min; curing temperature 160℃-180℃, for example, 160℃, 170℃, 180℃; curing time 20min-30min, for example, 20min, 22min, 25min, 30min; pH 5-6, for example, 5.2, 5.5. This allows the formation of a micro-arc oxidized ceramic layer. Furthermore, other operating conditions of the micro-arc oxidation process are not specifically limited in this application, such as the bath temperature being 25℃-28℃ (e.g., 26℃). The spraying process includes single-stage spraying, two-stage spraying, and three-stage spraying; The curing steps in the first-stage spraying and the second-stage spraying each independently include the following stages: First preheating stage: The temperature is 40℃-60℃, for example, 40℃, 50℃, 55℃, 60℃, etc. In addition, the time can be 1min-10min, for example, 1min, 3min, 5min, 8min, 10min, etc. First leveling stage: temperature is 65℃-75℃, for example, 65℃, 67℃, 75℃, etc. In addition, time can be 1min-10min, for example, 1min, 3min, 5min, 8min, 10min, etc. First baking stage: temperature is 75℃-85℃, for example, 75℃, 80℃, 83℃, 85℃, etc.; in addition, time is 25min-35min, for example, 25min, 26min, 28min, 30min, 35min, etc. The curing step in the three-stage spraying process includes the following stages: The second preheating stage: the temperature is 40℃-60℃, for example, 40℃, 50℃, 55℃, 60℃, etc. In addition, the time can be 1min-10min, for example, 1min, 3min, 5min, 8min, 10min, etc. The second leveling stage: the temperature is 45℃-55℃, for example, 45℃, 50℃, 53℃, 55℃, etc. In addition, the time can be 1min-10min, for example, 1min, 3min, 5min, 8min, 10min, etc. The second baking stage: the temperature is 45℃-55℃, for example, 45℃, 50℃, 53℃, 55℃, etc. In addition, the time is 25min-35min, for example, 25min, 26min, 28min, 30min, 35min, etc.

[0051] Thus, a composite protective layer is formed on the surface of the metal component. Simultaneously, this application utilizes a spraying process to improve the uniformity and thickness of the film layer, avoiding problems such as uneven film thickness or excessively thin areas leading to corrosion initiation points.

[0052] As an example, a micro-arc oxidation (MAO) process is used to prepare a micro-arc oxidation ceramic layer. Specific process parameters include: The chemical solution ratio for micro-arc oxidation is: Na2SiO3 3g / L-7g / L, KF 6g / L-10g / L, KOH 9g / L-13g / L.

[0053] The electrophoresis bath consists of: PD8000 black paste: 10%-14% (e.g., 10%, 12%, 14%, etc.), PD8000 emulsion: 30%-42% (e.g., 30%, 35%, 42%, etc.), additives: 1%-3% (e.g., 1%, 2%, 3%, etc.), with the balance being water.

[0054] Electrophoresis parameters: voltage 220V, time 3min-6min (e.g., 3min, 5min, 6min, etc.), drying and curing temperature 160℃-180℃ (e.g., 160℃, 170℃, 180℃, etc.), curing time 20min-30min (e.g., 20min, 25min, 30min, etc.), pH 5-6, bath temperature 25-28℃ (e.g., 25℃, 26℃, 28℃, etc.).

[0055] As an example, an anti-corrosion layer consisting of a chemical conversion film and an electrophoretic coating is prepared using a film-electrophoretic composite process. Specific process parameters include: Composition of the solution: PD8000 black paste: 8%-12%, for example, 10%; PD8000 emulsion: 40%-45%, for example, 42%; additives: 1%-3%, for example, 2%; water: balance; preparation of electrophoresis tank solution.

[0056] Electrophoresis parameters: voltage 220V, time 45min-60min, for example, 56min, etc.

[0057] As an example, the specific process for preparing the paint layer includes the parameters shown in Table 1.

[0058] Table 1

[0059] In a third aspect of this application, a device is proposed, comprising the metal component described in the first aspect or a metal component manufactured using the method described in the second aspect; the device includes a wearable electronic device, which includes smart glasses. Thus, this device possesses all the features and advantages of the aforementioned metal component and the aforementioned method for manufacturing the metal component, which will not be repeated here.

[0060] In some embodiments, the metal components in the smart glasses include at least one of a frame, a hinge, and a reinforcing steel sheet. Specifically, the first metal component can be a frame, and the second metal component can be a hinge or an FPC reinforcing steel sheet.

[0061] In some embodiments, the contact area of ​​the reinforcing steel sheet in the smart glasses is not laser-etched. This application removes the laser-etched area on the surface of the FPC reinforcing steel sheet, which was originally intended for welding or grounding, while retaining its original insulating layer (such as a cover film or insulating adhesive) or adding insulating gaskets (inserting gaskets made of insulating materials such as PET or PI at the assembly interface). This achieves an insulating layer between the FPC reinforcing steel sheet and the frame, blocking electrical contact between different metals and improving resistance to salt spray corrosion. Figure 2 As shown.

[0062] In some embodiments, the grounding area in the smart glasses is located on the inner sidewall of the frame. Conventional smart glasses use a design where the electrical connection is laser-engraved on a screw post (i.e., the grounding position - screw post), and the hinge is tightened to press the FPC to achieve electrical grounding. The hinge is a moving part, subject to significant contact with the external salt spray environment, leading to rapid corrosion from salt spray. This application, however, moves the grounding area to the inner sidewall of the frame, away from the salt spray inlet, making it difficult for salt spray to reach this location, effectively preventing electrolytic corrosion of the frame and FPC. Figure 3 As shown.

[0063] The description of the various embodiments above tends to emphasize the differences between the various embodiments. The similarities or similarities between them can be referred to, and for the sake of brevity, they will not be repeated here.

[0064] The following specific embodiments illustrate the solution of this application. It should be noted that these embodiments are for illustrative purposes only and should not be considered as limiting the scope of this application. Where specific techniques or conditions are not specified in the embodiments, they are performed according to the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0065] Example 1 This embodiment provides a metal component that can be applied to smart glasses, including: First metal component (frame, made of magnesium alloy) and second metal component (FPC reinforcing steel sheet, made of stainless steel). An insulating layer with a thickness of 0.08 mm is provided between the first metal part and the second metal part. Specifically, the surface of the FPC reinforcing steel sheet is covered with the original insulating layer (covering film) as an insulating layer. The contact area between the FPC reinforcing steel sheet and the frame retains the original insulating layer, and the contact area is not laser-engraved. The contact area is moved from the conventional screw post side to the inner wall of the frame, thereby cutting off the electronic path for electro-corrosion between different metals. The surface of the first metal part is provided with a composite protective layer, which includes an anti-corrosion layer and a paint layer stacked together. The anti-corrosion layer is a micro-arc oxidation ceramic layer with a thickness of 15μm. The preparation process and parameters include: the chemical solution ratio for micro-arc oxidation is: Na2SiO3 6.8g / L, KF 8.2g / L, KOH 10.5g / L; the electrophoresis bath solution is: PD8000 black paste: 12.7%, PD8000 emulsion: 35.5%, additives: 2% (leveling agent polyoxyethylene sec-octylphenol ether 1%, defoamer polyoxyethylene sec-octylphenol ether 1%), with the balance being water; the electrophoresis parameters are: voltage 220V, time 4.5min, drying and curing temperature 172℃, curing time 25min, pH 5.5, and bath temperature 26℃. The paint layer is 55 μm thick, and the preparation process steps and parameters are shown in the table below:

[0066] Example 2 The only difference between this embodiment and Embodiment 1 is that: (1) The thickness of the anti-corrosion layer is 10 μm; (2) The thickness of the paint layer is 46 μm (the first coating forms a film thickness of 14 μm, the second coating forms a film thickness of 14 μm, and the third coating forms a film thickness of 18 μm).

[0067] Comparative Example 1 The difference between this comparative example and Example 1 is that: (1) An insulating layer is provided only between the first metal part and the second metal part.

[0068] Comparative Example 2 The difference between this comparative example and Example 1 is that: (1) Only the anti-corrosion layer is provided on the surface of the first metal part.

[0069] Comparative Example 3 The difference between this comparative example and Example 1 is that: (1) A paint layer is applied only to the surface of the first metal part.

[0070] Test case This test example demonstrates the salt spray resistance test conducted on the metal components obtained from the above embodiments and comparative examples. The test results are shown in Table 2.

[0071] Table 2

[0072] As shown in Table 2, compared with Comparative Examples 1-3, the metal components provided in this application have better resistance to salt spray corrosion. Moreover, the "insulation layer + anti-corrosion layer + paint layer" system simultaneously cuts off the electronic and ion pathways in electrochemical corrosion, showing a positive synergistic effect. If only a single measure is used, the problem of multi-metal salt spray corrosion cannot be completely solved.

[0073] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A metal component, characterized in that, include: Multiple metal components, including a first metal component and a second metal component with different electrode potentials; An insulating layer is located between the first metal component and the second metal component; as well as The composite protective layer includes an anti-corrosion layer on the surface of the first metal part and / or the second metal part and a paint layer on the surface of the anti-corrosion layer.

2. The metal component according to claim 1, characterized in that, The thickness of the insulating layer is 0.05mm-0.1mm; And / or, the insulating layer includes at least one of an insulating coating, an insulating gasket, and an insulating adhesive.

3. The metal component according to claim 1 or 2, characterized in that, The thickness of the anti-corrosion layer is 10μm-20μm.

4. The metal component according to any one of claims 1-3, characterized in that, The corrosion-resistant layer includes at least one of a micro-arc oxidation ceramic layer, a chemical conversion film layer, and an electrophoretic coating.

5. The metal component according to claim 4, characterized in that, The micro-arc oxidation ceramic layer comprises the following raw materials: Na2SiO3 3g / L-7g / L, KF 6g / L-10g / L, KOH 9g / L-13g / L; Alternatively, the raw material system of the chemical conversion film may include chromate system solutions or titanium-zirconium system solutions; Alternatively, the electrophoretic coating comprises the following raw materials in weight fractions: 10wt%-14wt% pigment, 30wt%-42wt% film-forming emulsion, 1wt%-3wt% additives, and the balance being water; wherein the additives include leveling agents, defoamers, cosolvents, neutralizers, and catalysts.

6. The metal component according to any one of claims 1-5, characterized in that, The thickness of the paint layer is ≥28μm; And / or, the paint layer comprises the following raw materials: anti-corrosion paint, curing agent and thinner, wherein the weight ratio of the anti-corrosion paint, the curing agent and the thinner is 100:(5-15):(20-100).

7. A method for preparing the metal component according to any one of claims 1-6, characterized in that, Includes the following steps: An insulating layer is provided between a first metal component and a second metal component with different electrode potentials; A composite protective layer is formed on the surface of the first metal part and / or the second metal part.

8. The method according to claim 7, characterized in that, The step of forming a composite protective layer on the surface of the first metal part and / or the second metal part includes the following process: An anti-corrosion layer is formed on the surface of the first metal part and / or the second metal part using a micro-arc oxidation process; A paint layer is formed on the surface of the anti-corrosion layer using a spraying process; The operating conditions of the micro-arc oxidation process include: voltage 215V-225V, time 3min-6min, pH 5-6. The spraying process includes single-stage spraying, two-stage spraying, and three-stage spraying; The curing steps in the first-stage spraying and the second-stage spraying each independently include the following stages: First preheating stage: temperature 40℃-60℃; First leveling stage: temperature 65℃-75℃; First baking stage: temperature 75℃-85℃; The curing step in the three-stage spraying process includes the following stages: Second preheating stage: temperature 40℃-60℃; Second leveling stage: temperature 45℃-55℃; Second baking stage: temperature 45℃-55℃.

9. A device, characterized in that, Includes the metal component as described in any one of claims 1-6 or the metal component obtained by the method described in any one of claims 7-8; The device includes wearable electronic devices, which include smart glasses.

10. The device according to claim 9, characterized in that, The metal components in the smart glasses include at least one of the following: frame, hinge, and reinforcing steel sheet; And / or, the grounding area in the smart glasses is located on the inner sidewall of the frame; And / or, the contact area of ​​the reinforcing steel sheet in the smart glasses is not laser-engraved.

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