Method for cold spraying of zinc-aluminum composite coating on power transmission and transformation equipment and zinc-aluminum composite coating

Abstract

The invention provides a method for cold spraying of a zinc-aluminum composite coating on power transmission and transformation equipment and the zinc-aluminum composite coating. The method comprises the following steps: uniformly mixing zinc powder, aluminum powder and oxide ceramic powder to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder comprises large-particle oxide ceramic powder with the particle size of 150-400 microns and small-particle oxide ceramic powder with the particle size of 30-40 microns; the zinc-aluminum-oxide ceramic composite powder is subjected to high-pressure pneumatic cold spraying to the surface of the metal material of the power transmission and transformation equipment, and a zinc-aluminum composite coating is formed on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of high-pressure pneumatic cold spraying ranges from 0.8 MPa to 5 MPa, the carrier gas temperature ranges from 400 DEG C to 600 DEG C, and the spraying distance ranges from 20 mm to 30 mm. The method is suitable for industrial application, and the zinc-aluminum coating with high compactness, high bonding strength and high corrosion resistance can be formed on the surface of a metal material of power transmission and transformation equipment.

Description

Technical Field

[0001] The invention belongs to the technical field of electric contact material preparation, and in particular relates to a method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment and a zinc-aluminum composite coating. Background Art

[0002] With the development of the power grid, the safety and reliability requirements of power transmission and transformation of the power grid are becoming higher and higher. At present, there are still many problems in the power transmission and transformation process of the power grid, especially those caused by the corrosion of metal materials of power transmission and transformation equipment. Metal materials are the basis of power transmission and transformation of the power grid. The corrosion failure, protection technology and service life prediction and monitoring of metal materials are increasingly receiving attention. In recent years, there have been frequent problems with the corrosion failure of metal parts of power transmission and transformation equipment. The environment in which the metal materials of power transmission and transformation equipment of the power grid are located is generally complex and regional, so the corrosion of power transmission and transformation equipment is also very complex. The corrosion of power transmission and transformation equipment will seriously affect its service life, cause safety hazards, and increase operation and maintenance costs. Therefore, the problem of surface corrosion protection of metal structures of power transmission and transformation equipment of the power grid has become a key issue of concern in the industry.

[0003] At present, the surface of the metal structure of the power transmission and transformation equipment of the power grid is mostly protected by the traditional hot-dip galvanizing technology to prepare zinc-based corrosion-resistant coatings. This technology is not environmentally friendly during the coating preparation process, and the anti-corrosion ability of the hot-dip galvanized coating for power transmission and transformation is limited, and the maintenance or replacement frequency is increased. The corrosion resistance of the coating prepared by cold spraying technology is more than 1 times that of the coating prepared by thermal spraying technology, and the anti-corrosion performance of the coating prepared by thermal spraying technology is higher than that of the coating prepared by hot dip plating technology. The coating prepared by cold spraying technology has a high bonding strength with the substrate and has high resistance to mechanical and electrical impact. Based on the full life cycle considerations, the coating prepared by cold spraying technology has lower carbon emission characteristics than the coating prepared by hot dip plating technology, and the coating preparation process of cold spraying technology is more environmentally friendly (only noise and dust pollution). In the power transmission and transformation engineering system of the power grid, the research on cold spray zinc-based coatings is still in its early stages, and a cold spray zinc-based coating technology suitable for industrial application has not yet been developed.

[0004] In summary, the purpose of the present invention is to provide a cold spray zinc-based coating technology for power transmission and transformation equipment that is suitable for industrial application and can form a high-density, high-bonding-strength, and high-corrosion-resistant coating on the surface of metal materials of power transmission and transformation equipment. Summary of the invention

[0005] The purpose of the present invention is to provide a cold spray zinc-based coating technology for power transmission and transformation equipment which is suitable for industrial application and can form a coating with high density, high bonding strength and high corrosion resistance on the surface of metal materials of power transmission and transformation equipment.

[0006] In order to achieve the above object, the present invention provides the following technical solutions.

[0007] In a first aspect, the present invention provides a method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment, wherein the method comprises:

[0008] Mixing zinc powder, aluminum powder and oxide ceramic powder to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 150 microns to 400 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns to 40 microns;

[0009] The zinc-aluminum-oxide ceramic composite powder is high-pressure pneumatically cold sprayed onto the surface of the metal material of the power transmission and transformation equipment to form a zinc-aluminum composite coating on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 0.8-5MPa, the carrier gas temperature is 400-600℃, and the spraying distance is 20-30mm.

[0010] The method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment provided by the present invention uses compressed gas as a high-pressure pneumatic source to cause zinc-aluminum powder to collide with the surface of a metal material of the power transmission and transformation equipment to cause strong plastic deformation and accumulate into a coating. Large-particle oxide ceramic powder and small-particle oxide ceramic powder collide with the coating formed by the above-mentioned zinc-aluminum powder at high speed, achieving large-particle size forging and small-particle size inlaying, thereby improving the bonding strength and density of the coating, and finally obtaining a zinc-aluminum composite coating with high density, high bonding strength and high corrosion resistance.

[0011] According to a preferred embodiment of the first aspect, the mass ratio of zinc powder, aluminum powder and oxide ceramic powder is 4:(1-8):(0.1-1).

[0012] According to a preferred embodiment of the first aspect, the mass ratio of the large-particle oxide ceramic powder to the small-particle oxide ceramic powder is 1:1-1:3.

[0013] According to a preferred embodiment of the first aspect, during the high-pressure pneumatic cold spraying process, the powder delivery flow rate is 1-4 L / min.

[0014] According to a preferred embodiment of the first aspect, the travel speed of the spray gun is 10-30 mm / s.

[0015] According to a preferred embodiment of the first aspect, the particle size of the zinc powder is 10-100 microns; more preferably, the particle size of the zinc powder is 10-50 microns.

[0016] According to a preferred embodiment of the first aspect, the particle size of the aluminum powder is 10-100 microns; more preferably, the particle size of the aluminum powder is 20-50 microns.

[0017] According to a preferred embodiment of the first aspect, the thickness of the zinc-aluminum composite coating is 50-300 microns.

[0018] According to a preferred embodiment of the first aspect, the method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment further comprises:

[0019] The surface of the metal material of the power transmission and transformation equipment is first polished, cleaned and sandblasted before high-pressure pneumatic cold spraying.

[0020] According to a preferred embodiment of the first aspect, the mixing of zinc powder, aluminum powder and oxide ceramic powder is achieved by mechanical mixing.

[0021] In a second aspect, the present invention provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment provided in the first aspect of the present invention.

[0022] In a third aspect, the present invention provides an application of the zinc-aluminum composite coating provided in the second aspect of the present invention in the preparation of corrosion-resistant metals.

[0023] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0024] (1) The technical solution provided by the present invention adopts a high-pressure cold spraying method to prepare a zinc-aluminum composite coating. The production process is simple and environmentally friendly, and is suitable for on-site industrial implementation.

[0025] (2) The technical solution provided by the present invention utilizes oxide ceramic powders of different sizes to strengthen the zinc-aluminum composite coating, thereby realizing the forging and inlaying of the zinc-aluminum composite coating by the oxide ceramic powder, improving the density and bonding strength of the zinc-aluminum composite coating, and enhancing the corrosion resistance.

[0026] (3) The technical solution provided by the present invention utilizes oxide ceramic powders of different sizes to enhance the zinc-aluminum composite coating. On the one hand, the prepared zinc-aluminum composite coating can sacrifice zinc to generate Zn(OH) in a corrosive environment. 2 , that is, it can react with the corrosive medium to consume the corrosive medium, which can effectively alleviate the corrosion process; on the other hand, the prepared zinc-aluminum composite coating can generate an oxide passivation layer in a corrosive environment, and the oxide ceramic powder reinforcement phase in the coating will hinder the inward diffusion of the corrosive medium, showing good corrosion resistance.

[0027] (4) The technical solution provided by the present invention utilizes oxide ceramic powders of different sizes to enhance the zinc-aluminum composite coating. The corrosion-resistant environment of the prepared zinc-aluminum composite coating is gas or liquid. The corrosion resistance of the prepared zinc-aluminum composite coating is resistant to corrosion salts such as NaCl, KCl, and NaSO4.

[0028] (5) The technical solution provided by the present invention is simple and environmentally friendly, and can effectively improve the pollution problem in the use of existing anti-corrosion technology for power transmission and transformation equipment, improve the corrosion resistance of zinc-based coatings, extend the service life and operation and maintenance cycle, and reduce the production and operation and maintenance costs of enterprises. In terms of coating application, it provides corrosion protection for metal materials of basic equipment of power grid engineering, and can also be extended to other related industries, such as ocean, chemical industry, smelting, etc., to provide protective materials and implementation experience. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0030] Example 1

[0031] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0032] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0033] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0034] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:8:0.5 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 400 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0035] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 5 MPa, the carrier gas temperature is 400°C, the spraying distance is 20 mm, the powder feeding flow rate is 2 L / min, and the travel speed of the spray gun is 20 mm / s.

[0036] Example 2

[0037] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0038] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0039] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0040] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:6:0.5 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 400 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0041] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 5 MPa, the carrier gas temperature is 500° C., the spraying distance is 20 mm, the powder feeding flow rate is 2 L / min, and the travel speed of the spray gun is 10 mm / s.

[0042] Example 3

[0043] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0044] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0045] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0046] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:4:0.5 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 400 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0047] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 5 MPa, the carrier gas temperature is 600°C, the spraying distance is 20 mm, the powder feeding flow rate is 2 L / min, and the travel speed of the spray gun is 10 mm / s.

[0048] Example 4

[0049] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0050] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0051] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0052] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:5:0.5 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 150 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0053] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 150 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 0.8 MPa, the carrier gas temperature is 600°C, the spraying distance is 20 mm, the powder feeding flow rate is 1 L / min, and the travel speed of the spray gun is 10 mm / s.

[0054] Example 5

[0055] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0056] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0057] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0058] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:7:0.5 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 150 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0059] 3) High-pressure pneumatic cold spraying the zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after the surface roughening in step 1), to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 0.8 MPa, the carrier gas temperature is 500°C, the spraying distance is 20 mm, the powder feeding flow rate is 1 L / min, and the travel speed of the spray gun is 10 mm / s.

[0060] Example 6

[0061] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0062] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0063] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0064] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:8:0.8 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 150 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0065] 3) High-pressure pneumatic cold spraying the zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after the surface roughening in step 1), to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 0.8 MPa, the carrier gas temperature is 400°C, the spraying distance is 20 mm, the powder feeding flow rate is 1 L / min, and the travel speed of the spray gun is 10 mm / s.

[0066] Example 7

[0067] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0068] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0069] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0070] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:4:0.3 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 300 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0071] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 250 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 3 MPa, the carrier gas temperature is 600°C, the spraying distance is 20 mm, the powder feeding flow rate is 2 L / min, and the travel speed of the spray gun is 10 mm / s.

[0072] Example 8

[0073] This embodiment provides a zinc-aluminum composite coating, which is prepared by the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment as described below.

[0074] Wherein, the method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment comprises:

[0075] 1) The surface of the steel-based power transmission and transformation equipment metal material is polished, cleaned, and sandblasted (sandblasting for 5 minutes) in sequence to obtain a steel-based power transmission and transformation equipment metal material with a roughened surface (roughness ≥ 10 microns);

[0076] 2) Mechanically mixing zinc powder, aluminum powder and oxide ceramic powder in a mass ratio of 4:5:0.2 to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 300 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns; the particle size of the zinc powder is 40 microns, and the particle size of the aluminum powder is 30 microns;

[0077] 3) High-pressure pneumatic cold spraying of zinc-aluminum-oxide ceramic composite powder onto the surface of the metal material of the power transmission and transformation equipment after surface roughening in step 1) to form a zinc-aluminum composite coating with a thickness of 200 μm on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 3 MPa, the carrier gas temperature is 500° C., the spraying distance is 20 mm, the powder feeding flow rate is 2 L / min, and the travel speed of the spray gun is 10 mm / s.

[0078] Experimental example

[0079] The zinc-aluminum composite coatings prepared in Examples 1 to 8 were tested for compactness, coating bonding strength and corrosion resistance.

[0080] The zinc-aluminum composite coatings prepared in Examples 1 to 8 are dense, have high bonding strength and good corrosion resistance. The zinc-aluminum composite coatings prepared in Examples 1 to 8 are exposed to simulated seawater (2.71wt.%NaCl+0.24wt.%MgCl 2 +0.34wt.%MgSO 4 +0.11wt.%CaCl 2 +0.08wt.%KCl+96.5wt.%) environment, and immersed for 1 hour, no serious corrosion occurred. Specifically, the coatings with more Zn (Example 3 and Example 7) had slight corrosion pits on the surface; the coatings with more Al (Example 1 and Example 6) had a few reticular cracks on the surface; the zinc-aluminum composite coatings of Examples 4 and 5 had almost no cracks and corrosion pits.

[0081] The embodiments described above are for better explaining the present invention. For technical researchers in the field, it is not difficult to make various modifications to these embodiments without departing from the principles and spirit of the present invention. Therefore, the present invention is not limited to the embodiments herein. The improvements and changes made by those skilled in the art to the present invention according to the principles and spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment, wherein: The method includes: Mixing zinc powder, aluminum powder and oxide ceramic powder to obtain zinc-aluminum-oxide ceramic composite powder; wherein the oxide ceramic powder includes large-particle oxide ceramic powder and small-particle oxide ceramic powder, the particle size of the large-particle oxide ceramic powder is 150 microns to 400 microns, and the particle size of the small-particle oxide ceramic powder is 30 microns to 40 microns; The zinc-aluminum-oxide ceramic composite powder is high-pressure pneumatically cold sprayed onto the surface of the metal material of the power transmission and transformation equipment to form a zinc-aluminum composite coating on the surface of the metal material of the power transmission and transformation equipment; wherein the gas pressure of the high-pressure pneumatic cold spraying is 0.8-5MPa, the carrier gas temperature is 400-600℃, and the spraying distance is 20-30mm.

2. The method according to claim 1, wherein: The mass ratio of zinc powder, aluminum powder and oxide ceramic powder is 4:(1-8):(0.1-1).

3. The method according to claim 1, wherein: The mass ratio of the large-particle oxide ceramic powder to the small-particle oxide ceramic powder is 1:1-1:

3.

4. The method according to claim 1, wherein: During high-pressure pneumatic cold spraying, the powder delivery rate is 1-4L / min.

5. The method according to claim 1, wherein: The travel speed of the spray gun is 10-30mm / s.

6. The method according to claim 1, wherein: The thickness of the zinc-aluminum composite coating is 50-300 microns.

7. The method according to claim 1, wherein: The particle size of the zinc powder is 10-100 microns; preferably, the particle size of the zinc powder is 10-50 microns; The particle size of the aluminum powder is 10-100 microns; preferably, the particle size of the aluminum powder is 20-50 microns.

8. The method according to claim 1, wherein: The method for cold spraying zinc-aluminum composite coating on power transmission and transformation equipment also includes: The surface of the metal material of the power transmission and transformation equipment is first polished, cleaned and sandblasted before high-pressure pneumatic cold spraying.

9. A zinc-aluminum composite coating, which is prepared by the method for cold spraying a zinc-aluminum composite coating on power transmission and transformation equipment according to any one of claims 1 to 8.

10. Use of the zinc-aluminum composite coating according to claim 9 in the preparation of corrosion-resistant metals.