A protective structure applied to black chrome plated parts

Abstract

This utility model relates to the field of protective structure technology, specifically a protective structure applied to black chromium electroplated parts. The protective structure includes a metal substrate, a trivalent chromium black chromium plating layer, a passivation film, and a graphene composite layer. The trivalent chromium black chromium plating layer is located outside the metal substrate, and the passivation film is formed outside the trivalent chromium black chromium plating layer. The passivation film is formed by low-temperature plasma treatment, promoting the formation of a dense Cr2O3 passivation film on the surface of the trivalent chromium black chromium plating layer. The graphene composite layer is coated outside the passivation film. A copper plating layer is disposed outside the metal substrate, including a pre-plated copper layer, an intermediate copper plating layer, and a bright copper plating layer. The metal substrate is prepared into a pre-plated copper layer using a cyanide process, and the exterior of the pre-plated copper layer is thickened using a pyrophosphate process to form the intermediate copper plating layer. This utility model has the advantages of simple structure, reasonable design, and effectively maintaining the appearance of black chromium electroplated parts while extending their service life.

Description

Technical Field

[0001] This utility model relates to the field of protective structure technology, specifically a protective structure applied to black chrome electroplated parts. Background Technology

[0002] In the field of precision machinery manufacturing, black chrome plating, with its dignified aesthetic characteristics and moderate functional characteristics, has become the preferred surface treatment solution for high-end parts. It is widely used in high-precision optical instruments, aerospace components and high-end electronic equipment. Therefore, it is necessary to design protective structures to greatly improve the service life of black chrome plating parts.

[0003] In practical use, existing protective structures often suffer from low service life due to the high porosity of the outermost trivalent chromium black chromium plating layer on black chromium electroplated parts. This often relies on the lower layer to shield against corrosion, affecting the appearance of the black chromium electroplated parts. To address this issue, the inventors designed a protective structure for black chromium electroplated parts. Utility Model Content

[0004] The purpose of this utility model is to provide a protective structure for black chrome electroplated parts, which has the advantages of simple structure, reasonable design, and can effectively maintain the appearance of black chrome electroplated parts while extending their service life, thus solving the problems mentioned in the above technical background.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a protective structure for black chromium electroplated parts, the protective structure comprising a metal substrate, a trivalent chromium black chromium plating layer, a passivation film, and a graphene composite layer; the trivalent chromium black chromium plating layer is located outside the metal substrate, the passivation film is formed outside the trivalent chromium black chromium plating layer, the passivation film is treated by low-temperature plasma treatment to promote the formation of a dense Cr2O3 passivation film on the surface of the trivalent chromium black chromium plating layer, and the graphene composite layer is coated on the outside of the passivation film.

[0006] Preferably, the metal substrate is provided with a copper plating layer, which includes a pre-plated copper layer, an intermediate copper plating layer, and a bright copper plating layer.

[0007] Preferably, the metal substrate is prepared into a pre-plated copper layer using a cyanide process.

[0008] Preferably, the outer surface of the pre-plated copper layer is thickened using a pyrophosphate process to form an intermediate copper plating layer.

[0009] Preferably, the intermediate copper plating layer is formed using an acid copper plating process to create a bright copper plating layer.

[0010] Preferably, a nanocrystalline intermediate layer is disposed on the outside of the bright copper plating layer, and the nanocrystalline intermediate layer is formed by electrodeposition.

[0011] Preferably, a nickel plating layer is disposed on the outside of the nanocrystalline intermediate layer, a trivalent chromium white chromium plating layer is disposed on the outside of the nickel plating layer, and a trivalent chromium black chromium plating layer is disposed on the outside of the trivalent chromium white chromium plating layer.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. This utility model provides a protective structure for black chromium electroplated parts. The protective structure includes a metal substrate, a trivalent chromium black chromium plating layer, a passivation film, and a graphene composite layer. The overall structure is simple and reasonably designed. By using plasma passivation to form a passivation film, the micropores on the surface of the trivalent chromium black chromium plating layer are sealed, while reducing the energy consumption during the passivation film formation process. Furthermore, the graphene composite layer can fill the scratch by polymer polymerization triggered by electrochemical signals when the substrate is scratched.

[0014] 2. This utility model adopts a three-step design for the bottom copper plating layer, namely cyanide pre-plating, pyrophosphate thickening, and acid copper finishing, which takes into account the adhesion of black chrome electroplated parts and environmental protection, and avoids stress cracking of a single thick copper layer. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention;

[0016] Figure 2 This is a structural diagram of the copper plating layer of this utility model.

[0017] The reference numerals and names in the figure are as follows:

[0018] 1. Metal substrate; 2. Copper plating layer; 21. Pre-plated copper layer; 22. Intermediate copper plating layer; 23. Bright copper plating layer; 3. Nanocrystalline intermediate layer; 4. Nickel plating layer; 5. Trivalent chromium white chromium plating layer; 6. Trivalent chromium black chromium plating layer; 7. Passivation film; 8. Graphene composite layer. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In the description of the embodiments of this utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, 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 indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0021] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0022] Please see Figure 1 and Figure 2 The present invention provides an embodiment of a protective structure for black chromium electroplated parts, the protective structure comprising a metal substrate 1, a trivalent chromium black chromium plating layer 6, a passivation film 7, and a graphene composite layer 8; the trivalent chromium black chromium plating layer 6 is located outside the metal substrate 1, the passivation film 7 is formed on the outside of the trivalent chromium black chromium plating layer 6, the passivation film 7 is treated by low-temperature plasma treatment to promote the formation of a dense Cr2O3 passivation film on the surface of the trivalent chromium black chromium plating layer 6, and the graphene composite layer 8 is coated on the outside of the passivation film 7;

[0023] The metal substrate 1 serves as the foundation for the entire protection system, providing mechanical support and conducting current. The trivalent chromium black chromium plating layer 6, in matte black, meets the visual requirements of high-end products and provides a certain degree of wear resistance. The passivation film 7 fills the micropores of the chromium layer, enhancing the stability and corrosion resistance of the structure. The graphene composite layer 8 is used to repair scratches on self-healing black chromium electroplated parts.

[0024] A copper plating layer 2 is provided on the outside of the metal substrate 1. The copper plating layer 2 includes a pre-plated copper layer 21, an intermediate copper plating layer 22, and a bright copper plating layer 23.

[0025] The metal substrate 1 is pre-plated with copper layer 21 using a cyanide process;

[0026] The exterior of the pre-plated copper layer 21 is thickened using a pyrophosphate process to form an intermediate copper plating layer 22;

[0027] The intermediate copper plating layer 22 is formed into a bright copper plating layer 23 using an acid copper plating process;

[0028] The pre-plated copper layer 21 is rapidly deposited to form a uniform seed crystal layer, providing initial conductivity on the active metal and preventing displacement reaction. The intermediate copper plating layer 22 is efficiently thickened, enabling the black chrome electroplated part to be processed to the target thickness, and filling micro-defects in the substrate to improve surface smoothness. The bright copper plating layer 23 is used to reduce the roughness of subsequent plating layers and ensure the uniformity of the appearance of subsequent plating layers.

[0029] A nanocrystalline intermediate layer 3 is disposed on the outside of the bright copper plating layer 23, which is formed by electrodeposition.

[0030] The nanocrystalline intermediate layer 3 is used to eliminate grain boundary defects and improve interface toughness;

[0031] A nickel plating layer 4 is disposed on the outside of the nanocrystalline intermediate layer 3, a trivalent chromium white chromium plating layer 5 is disposed on the outside of the nickel plating layer 4, and a trivalent chromium black chromium plating layer 6 is disposed on the outside of the trivalent chromium white chromium plating layer 5.

[0032] The nickel plating layer 4 is used to isolate the copper layer and the chromium layer, preventing the risk of corrosion caused by the migration of copper ions. The trivalent chromium white chromium plating layer 5 uses its non-porous characteristics to block the penetration of corrosive media, thereby improving the stability of the protective structure.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A protective structure for use on black chrome electroplated parts, characterized in that, include: The metal substrate (1), the trivalent chromium black chromium plating layer (6), the passivation film (7) and the graphene composite layer (8) are located outside the metal substrate (1), the passivation film (7) is formed outside the trivalent chromium black chromium plating layer (6), the passivation film (7) is treated by low temperature plasma treatment to promote the formation of a dense Cr2O3 passivation film on the surface of the trivalent chromium black chromium plating layer (6), and the graphene composite layer (8) is coated on the outside of the passivation film (7).

2. The protective structure for black chrome electroplated parts according to claim 1, characterized in that, The metal substrate (1) is provided with a copper plating layer (2) on the outside. The copper plating layer (2) includes a pre-plated copper layer (21), an intermediate copper plating layer (22), and a bright copper plating layer (23).

3. The protective structure for black chrome electroplated parts according to claim 1, characterized in that, The metal substrate (1) is prepared into a pre-plated copper layer (21) using a cyanide process.

4. The protective structure for black chrome electroplated parts according to claim 3, characterized in that, The pre-plated copper layer (21) is thickened by a pyrophosphate process to form an intermediate copper plating layer (22).

5. A protective structure for black chrome electroplated parts according to claim 4, characterized in that, The intermediate copper plating layer (22) is formed into a bright copper plating layer (23) using an acid copper process.

6. A protective structure for black chrome electroplated parts according to claim 5, characterized in that, The bright copper plating layer (23) is provided with a nanocrystalline intermediate layer (3) on the outside, which is formed by electrodeposition.

7. A protective structure for black chrome electroplated parts according to claim 6, characterized in that, The nanocrystalline intermediate layer (3) is provided with a nickel plating layer (4) on the outside, a trivalent chromium white chromium plating layer (5) is provided on the outside of the nickel plating layer (4), and a trivalent chromium black chromium plating layer (6) is provided on the outside of the trivalent chromium white chromium plating layer (5).

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