A corrosion-resistant multilayer nickel alloy composite coating structure

Abstract

This utility model discloses a corrosion-resistant multilayer nickel alloy composite coating structure, relating to the field of nickel alloy technology. It includes a substrate and, from bottom to top, a corrosion-resistant structure, a high-temperature-resistant structure, and a wear-resistant structure sequentially disposed on the upper surface of the substrate. The corrosion-resistant structure comprises a nickel-copper alloy underlayer, a nickel-molybdenum alloy intermediate layer, and a nickel-chromium alloy top layer. The nickel-copper alloy underlayer covers the substrate, the nickel-molybdenum alloy intermediate layer covers the nickel-copper alloy underlayer, and the nickel-chromium alloy top layer covers the nickel-molybdenum alloy intermediate layer. The high-temperature-resistant structure comprises a nickel-cobalt alloy underlayer and a nickel-yttrium alloy top layer. The wear-resistant structure comprises a nickel-tungsten alloy underlayer and a nickel-graphite composite top layer. This utility model, by setting corrosion-resistant, high-temperature-resistant, and wear-resistant structures on the substrate and employing a multilayer coating structure, effectively enhances the corrosion resistance, high-temperature resistance, and wear resistance of nickel alloys, thereby better meeting the performance requirements in complex environments.

Description

Technical Field

[0001] This utility model relates to the field of nickel alloy technology, and in particular to a corrosion-resistant multilayer nickel alloy composite coating structure. Background Technology

[0002] Although nickel alloys currently possess certain corrosion resistance, high temperature resistance, and wear resistance properties, the traditional single-coating structure of nickel alloys often fails to meet the requirements of corrosion resistance, high temperature resistance, and wear resistance in complex environments, and their performance still needs to be significantly improved. Utility Model Content

[0003] The purpose of this invention is to solve the problem that traditional single-layer nickel alloy coating structures often fail to meet the requirements of corrosion resistance, high temperature resistance, and wear resistance in complex environments, and to propose a corrosion-resistant multilayer nickel alloy composite coating structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A corrosion-resistant multilayer nickel alloy composite coating structure includes a substrate and a corrosion-resistant structure, a high-temperature resistant structure, and a wear-resistant structure disposed sequentially from bottom to top on the upper surface of the substrate. The corrosion-resistant structure includes a nickel-copper alloy bottom layer, a nickel-molybdenum alloy intermediate layer, and a nickel-chromium alloy top layer.

[0006] As a preferred technical solution of this utility model, the nickel-copper alloy bottom layer covers the substrate, the nickel-molybdenum alloy intermediate layer covers the nickel-copper alloy bottom layer, and the nickel-chromium alloy top layer covers the nickel-molybdenum alloy intermediate layer.

[0007] As a preferred technical solution of this utility model, the high-temperature resistant structure includes a nickel-cobalt alloy bottom layer and a nickel-yttrium alloy top layer.

[0008] As a preferred technical solution of this utility model, the wear-resistant structure includes a nickel-tungsten alloy bottom layer and a nickel-graphite composite top layer.

[0009] As a preferred technical solution of this utility model, the nickel-cobalt alloy bottom layer covers the nickel-chromium alloy top layer, and the nickel-yttrium alloy top layer covers the nickel-cobalt alloy bottom layer.

[0010] As a preferred technical solution of this utility model, the nickel-tungsten alloy bottom layer covers the nickel-yttrium alloy top layer, and the nickel-graphite composite top layer covers the nickel-tungsten alloy bottom layer.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention incorporates a corrosion-resistant structure, a high-temperature resistant structure, and a wear-resistant structure on a substrate. The corrosion-resistant structure includes a nickel-copper alloy bottom layer, a nickel-molybdenum alloy intermediate layer, and a nickel-chromium alloy top layer. The high-temperature resistant structure includes a nickel-cobalt alloy bottom layer and a nickel-yttrium alloy top layer. The wear-resistant structure includes a nickel-tungsten alloy bottom layer and a nickel-graphite composite top layer. This multi-layer coating structure effectively enhances the corrosion resistance, high-temperature resistance, and wear resistance of the nickel alloy, thereby better meeting the performance requirements in complex environments. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a corrosion-resistant multilayer nickel alloy composite coating structure proposed in this utility model.

[0014] Figure 2 This is a schematic diagram of the composition of the corrosion-resistant structure in the corrosion-resistant multilayer nickel alloy composite coating structure proposed in this utility model.

[0015] Figure 3 This is a schematic diagram of the composition of the high-temperature resistant structure in the corrosion-resistant multilayer nickel alloy composite coating structure proposed in this utility model.

[0016] Figure 4 This is a schematic diagram of the wear-resistant structure in a corrosion-resistant multilayer nickel alloy composite coating structure proposed in this utility model.

[0017] In the figure: 1. Substrate; 2. Corrosion-resistant structure; 201. Nickel-copper alloy bottom layer; 202. Nickel-molybdenum alloy intermediate layer; 203. Nickel-chromium alloy top layer; 3. High-temperature resistant structure; 301. Nickel-cobalt alloy bottom layer; 302. Nickel-yttrium alloy top layer; 4. Wear-resistant structure; 401. Nickel-tungsten alloy bottom layer; 402. Nickel-graphite composite top layer. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Example 1, referring to Figure 1-2 A corrosion-resistant multilayer nickel alloy composite coating structure includes a substrate 1 and a corrosion-resistant structure 2, a high-temperature resistant structure 3 and a wear-resistant structure 4 arranged sequentially from bottom to top on the upper surface of the substrate 1.

[0020] Specifically, the corrosion-resistant structure 2 includes a nickel-copper alloy bottom layer 201, a nickel-molybdenum alloy intermediate layer 202, and a nickel-chromium alloy top layer 203; further, the nickel-copper alloy bottom layer 201 covers the substrate 1, the nickel-molybdenum alloy intermediate layer 202 covers the nickel-copper alloy bottom layer 201, and the nickel-chromium alloy top layer 203 covers the nickel-molybdenum alloy intermediate layer 202.

[0021] More specifically, the nickel-copper alloy underlayer 201 is made of nickel and copper in a 3:1 ratio to form a plating solution. The plating layer is deposited on the metal surface of the substrate 1 through an electroplating process to form the required plating layer. The nickel-copper alloy underlayer 201 can form a good bond with the metal of the substrate 1 and has a certain corrosion resistance, which can initially resist the erosion of corrosive media from the side of the substrate 1.

[0022] More specifically, the nickel-molybdenum alloy intermediate layer 202 is made by electroplating a solution of nickel and molybdenum in a 4:1 ratio, and the required coating is formed by electroplating on the nickel-copper alloy bottom layer 201. The nickel-molybdenum alloy intermediate layer 202 has excellent corrosion resistance, especially strong resistance to some oxidizing acids and chloride-containing corrosive media. It can further prevent corrosive media from penetrating the nickel-copper alloy bottom layer 201 to reach the substrate 1, and also provides good support for the nickel-chromium alloy top layer 203.

[0023] More specifically, the nickel-chromium alloy top layer 203 is made by electroplating a solution of nickel and chromium in a 7:3 ratio, and the required coating is formed by electroplating on the nickel-molybdenum alloy intermediate layer 202. The nickel-chromium alloy top layer 203 has good oxidation resistance, wear resistance and decorative properties. The addition of chromium allows the coating to form a dense chromium oxide protective film in the air, which effectively resists the erosion of external corrosive media (such as water vapor and acid rain in the atmosphere).

[0024] The working principle of this embodiment is as follows: First, the nickel-copper alloy bottom layer 201, through its tight bonding with the base metal 1, isolates the base metal 1 from the external corrosive environment. The addition of copper changes the crystal structure of nickel, making the grains of the coating finer and increasing the density of the coating, thereby reducing the channels for the corrosive medium to penetrate. Second, in the nickel-molybdenum alloy intermediate layer 202, due to the special chemical properties of molybdenum, this layer has a high corrosion resistance potential and can form a stable passivation film in the corrosive medium. This passivation film can effectively prevent the corrosive medium from further penetrating into the nickel-copper alloy bottom layer 201, protecting the nickel-copper alloy bottom layer 201 and the base metal 1 from corrosion. Finally, the chromium in the nickel-chromium alloy top layer 203 is easily oxidized in air to form a thin and dense chromium oxide protective film. This protective film can prevent the external corrosive medium from contacting the interior of the coating, further improving the corrosion resistance.

[0025] Example 2, refer to Figure 1 and Figure 3 This embodiment is an optimization based on embodiment 1. Specifically, the high-temperature resistant structure 3 includes a nickel-cobalt alloy bottom layer 301 and a nickel-yttrium alloy top layer 302. The nickel-cobalt alloy bottom layer 301 covers the nickel-chromium alloy top layer 203, and the nickel-yttrium alloy top layer 302 covers the nickel-cobalt alloy bottom layer 301.

[0026] More specifically, the nickel-cobalt alloy bottom layer 301 is made by mixing nickel and cobalt in a 4:1 ratio to form a plating solution, which is then electroplated onto the nickel-chromium alloy top layer 203 to form the required plating layer. The nickel-cobalt alloy bottom layer 301 can provide a stable foundation for the entire composite plating layer. The addition of cobalt element improves high temperature resistance and hardness, and can effectively prevent the bottom layer from softening and deforming in high temperature environments.

[0027] More specifically, the nickel-yttrium alloy top layer 302 is made by mixing nickel and yttrium in a 7:1 ratio to form a plating solution, which is then electroplated onto the nickel-cobalt alloy bottom layer 301 to form the required plating layer. Yttrium can refine the grains and improve the adhesion of the oxide film, thereby effectively resisting oxidation at high temperatures.

[0028] The working principle of this embodiment is as follows: First, in the nickel-cobalt alloy bottom layer 301, cobalt atoms and nickel atoms form a solid solution. This structure has good stability at high temperatures. The presence of cobalt increases the melting point and hardness of the alloy, enabling the bottom layer to withstand certain pressure and stress in a high-temperature environment and to resist softening and deformation. Second, in the nickel-yttrium alloy top layer 302, yttrium can refine the grains and improve the adhesion of the oxide film, thereby effectively resisting oxidation at high temperatures.

[0029] Example 3, referring to Figure 1 and Figure 4 This embodiment is an optimization based on embodiment 1. Specifically, the wear-resistant structure 4 includes a nickel-tungsten alloy bottom layer 401 and a nickel-graphite composite top layer 402. The nickel-tungsten alloy bottom layer 401 covers the nickel-yttrium alloy top layer 302, and the nickel-graphite composite top layer 402 covers the nickel-tungsten alloy bottom layer 401.

[0030] More specifically, the nickel-tungsten alloy bottom layer 401 is made of nickel and tungsten in a ratio of 8:2 to form a plating solution, which is then electroplated onto the nickel-yttrium alloy top layer 302. This electroplating layer forms a high hardness and good high temperature resistance. The addition of tungsten increases the melting point and hardness of the plating layer, enabling it to maintain good structural stability under high temperature conditions and effectively resist high temperature deformation and wear.

[0031] More specifically, the nickel-graphite composite top layer 402 is prepared by co-deposition process to make nickel and graphite particles into a plating solution, wherein the ratio of nickel to graphite is 9:1, and electroplating is performed on the nickel-tungsten alloy bottom layer 401. This electroplating layer has self-lubricating properties, and the graphite particles are uniformly distributed in the nickel matrix. When friction occurs on the surface of the component, the graphite can play a lubricating role, reduce the coefficient of friction, and reduce wear.

[0032] The working principle of this embodiment is as follows: First, under high temperature conditions, the crystal structure stability of the nickel-tungsten alloy bottom layer 401 is enhanced. This is because the chemical bond energy between tungsten atoms and nickel atoms is high, which can resist the diffusion of atoms and the deformation of the crystal lattice under high temperature, thereby achieving the functions of high temperature resistance and wear resistance. Second, the graphite particles in the nickel-graphite composite top layer 402 are embedded in nickel. When subjected to friction, the layered structure of graphite is easy to slide relative to each other, thereby playing a lubricating role. At the same time, the matrix 1 plays a role in fixing and protecting the graphite particles, preventing the graphite from wearing out and falling off too quickly, and ensuring the continuous effectiveness of the self-lubricating function.

[0033] In summary, this utility model, by setting a corrosion-resistant structure 2, a high-temperature resistant structure 3, and a wear-resistant structure 4 on the substrate 1, and adopting a multi-layer coating structure, can effectively enhance the corrosion resistance, high-temperature resistance, and wear resistance of nickel alloys, thereby better meeting the performance requirements in complex environments and having a better market prospect.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A corrosion-resistant multilayer nickel alloy composite coating structure, comprising a substrate (1) and a corrosion-resistant structure (2), a high-temperature resistant structure (3), and a wear-resistant structure (4) sequentially disposed on the upper surface of the substrate (1) from bottom to top, characterized in that, The corrosion-resistant structure (2) includes a nickel-copper alloy bottom layer (201), a nickel-molybdenum alloy intermediate layer (202), and a nickel-chromium alloy top layer (203).

2. The corrosion-resistant multilayer nickel alloy composite coating structure according to claim 1, characterized in that, The nickel-copper alloy bottom layer (201) covers the substrate (1), the nickel-molybdenum alloy intermediate layer (202) covers the nickel-copper alloy bottom layer (201), and the nickel-chromium alloy top layer (203) covers the nickel-molybdenum alloy intermediate layer (202).

3. The corrosion-resistant multilayer nickel alloy composite coating structure according to claim 1, characterized in that, The high-temperature resistant structure (3) includes a nickel-cobalt alloy bottom layer (301) and a nickel-yttrium alloy top layer (302).

4. The corrosion-resistant multilayer nickel alloy composite coating structure according to claim 1, characterized in that, The wear-resistant structure (4) includes a nickel-tungsten alloy bottom layer (401) and a nickel-graphite composite top layer (402).

5. The corrosion-resistant multilayer nickel alloy composite coating structure according to claim 3, characterized in that, The nickel-cobalt alloy bottom layer (301) covers the nickel-chromium alloy top layer (203), and the nickel-yttrium alloy top layer (302) covers the nickel-cobalt alloy bottom layer (301).

6. The corrosion-resistant multilayer nickel alloy composite coating structure according to claim 4, characterized in that, The nickel-tungsten alloy bottom layer (401) covers the nickel-yttrium alloy top layer (302), and the nickel-graphite composite top layer (402) covers the nickel-tungsten alloy bottom layer (401).

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