Nanometer deposition heavy-duty anti-corrosion graphene composite nano coating, preparation method and application

Abstract

This invention discloses a nano-deposited, heavy-duty anti-corrosion graphene composite nano-coating, which is composed of the following components by weight: 66-82 parts of a polyimide-toughened polyphthalonitrile resin composition solution; 1-2 parts of nano-calcium silicate; 1-2 parts of nano-silicon nitride; 1-2 parts of graphene; 3-5 parts of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate; 2-3 parts of lead powder; 1-2 parts of chromium carbide powder; 1-2 parts of tungsten powder; 1-2 parts of cobalt powder; 1-2 parts of silicon carbide; 1-2 parts of tungsten carbide powder; 1-2 parts of nickel powder; 1-2 parts of boron powder; 1-2 parts of rhenium powder; 1-2 parts of zirconium carbide powder; and 1-2 parts of zirconium oxide powder. After baking, cross-linking, and curing, the coating forms a powder coating with properties such as high temperature resistance, resistance to rapid heating and cooling, fire resistance and scorching prevention, heat insulation and heat dissipation, resistance to damp heat, salt spray resistance, impact resistance, and low friction.

Description

Technical Field

[0001] This invention relates to the field of metal surface treatment technology, specifically to a nano-deposited heavy-duty anti-corrosion graphene composite nano-coating, its preparation method, and its application. Background Technology

[0002] Military coatings resistant to 2000 degrees Celsius are primarily used in military equipment and facilities requiring extremely high temperature resistance. These coatings typically possess excellent high-temperature resistance, oxidation resistance, heat insulation, and corrosion resistance, protecting the substrate from damage in extreme environments. For example, Beijing Zhisheng Weihua's functional high-temperature resistant coating ZS-1 can withstand temperatures up to 2000℃, allowing it to withstand prolonged exposure to flames with excellent heat insulation. Additionally, the ultra-high temperature refractory coating CY-CM also exhibits 2000℃ resistance, preventing metal oxidation and extending service life. The technical characteristics of these coatings include: 1. High-temperature resistance: These coatings remain stable at 2000℃, preventing substrate oxidation and corrosion. 2. Oxidation resistance: A dense ceramic protective layer isolates oxygen, protecting the substrate from oxidation. 3. Heat insulation: Highly efficient heat insulation reduces heat loss. Application areas include military equipment, aerospace vehicles, and high-temperature industrial equipment, where the requirements for high-temperature resistance and corrosion resistance of materials are extremely high. For example, the application of high-temperature resistant coatings in military equipment can significantly improve its survivability and service life under extreme conditions. Summary of the Invention

[0003] This invention provides a nano-deposited heavy-duty anti-corrosion graphene composite nano-coating. The nano-ceramic coating described in this invention has a high temperature resistance of up to 2600℃, a salt spray resistance of over 6000 hours, and a thermal conductivity as low as 0.011W / mK.

[0004] The nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating of the present invention is made of the following components by weight: 66-82 parts of polyimide toughened polyphthalonitrile resin composition solution; 1-2 parts of nano-calcium silicate; 1-2 parts of nano-silicon nitride; 1-2 parts of graphene; 3-5 parts of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate; 2-3 parts of lead powder; 1-2 parts of chromium carbide powder; 1-2 parts of tungsten powder; 1-2 parts of cobalt powder; 1-2 parts of silicon carbide; 1-2 parts of tungsten carbide powder; 1-2 parts of nickel powder; 1-2 parts of boron powder; 1-2 parts of rhenium powder; 1-2 parts of zirconium carbide powder; and 1-2 parts of zirconium oxide powder.

[0005] The preparation method of the polyimide-toughened polyphthalonitrile resin composition solution is as follows:

[0006] (1) Preparation of polyphthalonitrile resin

[0007] 15-25 parts by weight of 4 / 3-(4-hydroxybiphenoxy)phthalonitrile, 10-15 parts by weight of diphenyl ether diphenol-polyarylene ether nitrile, and 60-70 parts by weight of resorcinol-bisphenol ketone bisphthalonitrile are added to 100-150 parts by weight of ethanol and uniformly dispersed. The mixture is heated to 180-195℃ and stirred. The solvent is removed under reduced pressure to obtain the mixture. The mixture is then heated to solidify.

[0008] Preferably, the mixture is cured sequentially according to the following procedure: heating at 200-210℃ for 4-5 hours; heating at 270-290℃ for 2-3 hours; heating at 330-360℃ for 5-6 hours; heating at 400-410℃ for 2-3 hours; and heating at 430-450℃ for 8-9 hours to obtain polyphthalic nitrile resin.

[0009] The molecular structure of 4 / 3-(4-hydroxybiphenoxy)phthalonitrile is as follows:

[0010]

[0011] Preferably, the molecular structure of the diphenyl ether diphenol-polyarylene ether nitrile is as follows:

[0012]

[0013] Preferably, the molecular structure of the resorcinol-bisphenol ketone bisphthalonitrile is as follows:

[0014]

[0015] (2) Preparation of polyimide-toughened polyphthalonitrile resin composition solution

[0016] Dissolve diamine dinitrile (0.1 mol) and m-phenylenediamine (0.1 mol) in N-methylpyrrolidone (1 mol), add 3,3',4,4'-biphenyl dianhydride (0.2 mol) to the clear solution, and stir at room temperature for 24 h to obtain a polyimide resin solution containing cyano functional groups; add the polyphthalonitrile resin (354 g) obtained in step (1) to the polyimide resin solution containing cyano functional groups, stir evenly until the solution is clear, and obtain a polyimide toughened polyphthalonitrile resin composition solution.

[0017] Preferably, in step (1) above, the weight ratio of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile and resorcinol-bisphenol ketone bisphthalonitrile is 1:(3-4).

[0018] Preferably, in step (1) above, the weight ratio of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile, diphenyl ether diphenol-polyaryl ether nitrile and resorcinol-bisphenol ketone bisphthalonitrile is 20:10:70.

[0019] The present invention discloses a method for preparing a nano-deposited, heavily corrosion-resistant graphene composite nano-ceramic coating, which is produced through the following steps:

[0020] 1) Grind nano-calcium silicate, nano-silicon nitride, graphene, lead powder, chromium carbide powder, tungsten powder, cobalt powder, silicon carbide, tungsten carbide powder, nickel powder, boron powder, rhenium powder, zirconium carbide powder, and zirconium oxide for 20-24 hours to obtain mixed powder A;

[0021] 2) After mixing the polyimide toughened polyphthalonitrile resin composition solution, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate and mixed powder A for 8-10 hours, the mixture is then placed in a powder dryer and dried for 8-10 hours to obtain mixed powder B.

[0022] 3) Place the mixed powder B in a high-speed mixer to homogenize for 3-5 hours, then mix and plasticize it through a twin-screw extruder, and finally press and crush it through a cooling tablet press to obtain mixed powder C;

[0023] 4) Place the mixed powder C into a micro-grinding system for 8-10 hours to obtain a nano-deposited heavy-duty anti-corrosion graphene composite nano-coating.

[0024] The present invention also includes the application of the nano-deposited heavy-duty anti-corrosion graphene composite nano-coating in the surface treatment of high-temperature equipment metals.

[0025] The formulation principle of this invention is as follows:

[0026] Polyimide-toughened polyphthalonitrile resin composition solution is a high-temperature crosslinking agent; 1,3,5-tris(trimethoxysilylpropyl)isocyanurate is a curing agent and leveling agent; nano-calcium silicate has good high-temperature resistance and chemical stability, can withstand temperatures above 2000 degrees Celsius, and can also withstand low-temperature environments of -60 degrees Celsius, effectively isolating heat sources and reducing energy loss; nano-silicon nitride has extremely high mechanical strength and hardness, can withstand temperatures above 2000 degrees Celsius, and also has good thermal insulation and wear resistance; graphene has good thermal conductivity and thermal insulation properties, can withstand high-temperature environments for a long time, and has excellent mechanical properties and chemical stability in high-temperature environments; lead powder can shield ionizing radiation, magnetic field radiation, and pulse signals; chromium carbide powder is used for wear resistance, corrosion resistance, and oxidation resistance in high-temperature environments; tungsten powder has high strength, high hardness, wear resistance, high temperature resistance, high density, high melting point, good electrical conductivity, and corrosion resistance; cobalt powder has high strength, wear resistance, good weather resistance, corrosion resistance, high impact resistance, and high toughness. High tear resistance; silicon carbide possesses high temperature resistance, corrosion resistance, insulation properties, high strength, high hardness, and high temperature stability; tungsten carbide powder has high hardness, high wear resistance, high corrosion resistance, high strength, high temperature resistance, and high toughness, which can improve the hardness, compressive strength, and wear resistance of graphene composite nano-ceramic coatings; nickel powder can improve the conductivity, wear resistance, corrosion resistance, magnetic properties, and oxidation resistance of graphene composite nano-ceramic coatings; boron powder can effectively slow down the rate and extent of damage to graphene composite nano-ceramic coatings caused by high temperatures, while also improving... The strength and toughness of graphene composite nano-ceramic coatings are enhanced; rhenium powder can improve the high temperature, high pressure and corrosion resistance of graphene composite nano-ceramic coatings, while shielding thermal radiation; zirconium carbide powder can improve the high temperature resistance, oxidation resistance, strength, hardness, toughness, thermal conductivity, melting point, corrosion resistance, radiation resistance, wear resistance, thermal stress resistance and impermeability of graphene composite nano-ceramic coatings; zirconium oxide powder can improve the fracture toughness, bending strength, thermal conductivity, thermal shock resistance, high temperature resistance and wear resistance of graphene composite nano-ceramic coatings.

[0027] The method of using the nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating of this invention is as follows:

[0028] Apply the nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating evenly to the surface of the object to be coated using electrostatic spraying or electrode coating, and bake at a temperature of 300-400℃ for 30-60 minutes.

[0029] The beneficial effects of this invention are as follows:

[0030] In the nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating of the present invention, all components together form a powder coating. After baking, the powder coating cross-links and cures to form a powder coating layer. This coating layer has the characteristics of high temperature resistance, resistance to rapid heating and cooling, fire resistance and scorching prevention, heat insulation and heat dissipation, insulation and semiconducting properties, wear resistance and high hardness, electromagnetic pulse resistance, strong oxidation resistance, ultraviolet resistance, acid and alkali resistance, oil resistance, damp heat resistance, salt spray resistance, impact resistance, and low friction. Among them, the high temperature resistance can reach 2600℃, the salt spray resistance can reach more than 6000h, and the thermal conductivity is as low as below 0.011W / mK. These technical performances far exceed those of the same industry. Detailed Implementation

[0031] The preparation method of the polyimide-toughened polyphthalonitrile resin composition solution in the examples is as follows:

[0032] (1) Preparation of polyphthalonitrile resin: 20 parts of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile, 10 parts of diphenyl ether diphenol-polyaryl ether nitrile (n=5) and 70 parts of resorcinol-bisphenol ketone bisphthalonitrile (n=20) were added to 150 parts of ethanol and dispersed evenly. After stirring and mixing at 189°C, the solvent was removed under reduced pressure to obtain the mixture. The mixture was cured in sequence according to the following procedure: heating at 210°C for 4 hours; heating at 280°C for 2 hours; heating at 350°C for 5 hours; heating at 400°C for 2 hours; heating at 450°C for 8 hours to obtain polyphthalonitrile resin.

[0033] (2) Preparation of polyimide-toughened polyphthalonitrile resin composition solution: Diamine dinitrile (0.1 mol) and m-phenylenediamine (0.1 mol) were added to N-methylpyrrolidone (1 mol). After complete dissolution, 3,3',4,4'-biphenyl anhydride (0.2 mol) was added to the clear solution and stirred at room temperature for 24 h to obtain a polyimide resin solution containing cyano functional groups. Polyphthalonitrile resin (354 g) was added to the polyimide resin solution containing cyano functional groups and stirred until the solution was clear to obtain a polyimide-toughened polyphthalonitrile resin composition solution.

[0034] The preparation method of the polyimide-toughened polyphthalonitrile resin composition solution in Comparative Example 1 is as follows:

[0035] (1) Preparation of polyphthalonitrile resin: 70 parts of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile, 10 parts of diphenyl ether diphenol-polyaryl ether nitrile (n=5) and 20 parts of resorcinol-bisphenol ketone bisphthalonitrile (n=20) were added to 150 parts of ethanol and dispersed evenly. After stirring and mixing at 189°C, the solvent was removed under reduced pressure to obtain the mixture. The mixture was cured in sequence according to the following procedure: heating at 210°C for 4 hours; heating at 280°C for 2 hours; heating at 350°C for 5 hours; heating at 400°C for 2 hours; heating at 450°C for 8 hours to obtain polyphthalonitrile resin.

[0036] (2) Preparation of polyimide-toughened polyphthalonitrile resin composition solution: Diamine dinitrile (0.1 mol) and m-phenylenediamine (0.1 mol) were added to N-methylpyrrolidone (1 mol). After complete dissolution, 3,3',4,4'-biphenyl anhydride (0.2 mol) was added to the clear solution and stirred at room temperature for 24 h to obtain a polyimide resin solution containing cyano functional groups. Polyphthalonitrile resin (354 g) was added to the polyimide resin solution containing cyano functional groups and stirred until the solution was clear to obtain a polyimide-toughened polyphthalonitrile resin composition solution.

[0037] The molecular structure of the 4 / 3-(4-hydroxybiphenoxy)phthalonitrile is as follows:

[0038]

[0039] The molecular structure of the diphenyl ether diphenol-polyarylene ether nitrile is as follows:

[0040]

[0041] The molecular structure of the resorcinol-bisphenol ketone bis(phthalonitrile) is as follows:

[0042]

[0043] The materials used in the examples and comparative examples are sourced from the following sources:

[0044] Nano-calcium silicate is provided by Guangzhou Yifeng Chemical Technology Co., Ltd., with D50: 5μ, whiteness ≥94 degrees, moisture ≤0.1%, pH (10% suspension): 7.0-9.0, oil absorption 62%, SiO2 content ≤63.5%, and Ca content ≤33.5%.

[0045] The nano-silicon nitride was provided by Ningbo Luofei Nanotechnology Co., Ltd., item number: LF-Si3N4-N20, average particle size: 20nm, purity: 99.9%, microstructure: amorphous, color: white.

[0046] The graphene was provided by Henan Liugong Graphite Co., Ltd., model: LG-1409, ash content: 50ppm, fixed carbon: 99.996%, volatile matter: 0.01%, particle size: 1000 mesh.

[0047] The lead powder was provided by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., with a lead content of 99.9%, CAS No. 7439-92-1, process: atomization method, mesh size: 300 mesh, grade: pb-1.

[0048] Chromium carbide powder was supplied by Nangong Xindun Alloy Welding Materials & Spraying Co., Ltd., CAS No.: 12012-35-0, process: mechanical method, average particle size ≤1μm, grade: Cr3C2-X, total carbon: 13.2±0.2%, free carbon: ≤0.3%.

[0049] The tungsten powder was supplied by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., CAS No.: 7440-33-7, process: mechanical method, particle size: 300 mesh, tungsten content: 99.99%.

[0050] The cobalt powder was provided by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., CAS No.: 7440-48-4, process: electrolysis, particle size: 400 mesh, grade: FCoH-1, cobalt content: 99.98%, item number: 2596.

[0051] Silicon carbide is supplied by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., with SiC≥99.9%, mesh size 12500, item number: 021598, process: mechanical method.

[0052] Tungsten carbide powder was provided by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., CAS No.: 12070-12-1, process: electrolysis, particle size: 325 mesh, grade: FWC40-50, tungsten content: ≥96%.

[0053] The nickel powder was provided by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., CAS No.: 7440-02-0, process: electrolysis, particle size: 400 mesh, nickel content: ≥99.98%.

[0054] The boron powder was provided by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., with a density of 2.27 g / cm3, a melting point of 2300℃, a boiling point of 2550℃, a processing method of chemical reaction, and a boron content of ≥99.9%.

[0055] The rhenium powder was supplied by Nangong Xindun Alloy Welding Material Spraying Co., Ltd., CAS No.: 7440-15-5, process: atomization method, particle size: 300 mesh, rhenium content: ≥99.9%.

[0056] Zirconium carbide powder was provided by Nangong Xindun Alloy Welding Materials & Spraying Co., Ltd., CAS No.: 12070-14-3, particle size: 400 mesh, effective content: ≥99.9%.

[0057] Zirconia powder was provided by Nangong Xindun Alloy Welding Materials & Spraying Co., Ltd., CAS No.: 1314-23-4, process: mechanical method, particle size: 30,000 mesh, melting point: 2700℃, effective content: ≥99.9%.

[0058] In the following examples and comparative examples, the numbers are by weight.

[0059] Table 1 Composition of Examples 1-4

[0060]

[0061] Table 2 Composition of Examples 5-7 and Comparative Example 1

[0062]

[0063]

[0064] The preparation methods for the above embodiments and comparative examples are as follows:

[0065] 5) Place nano-calcium silicate, nano-silicon nitride, graphene, lead powder, chromium carbide powder, tungsten powder, cobalt powder, silicon carbide, tungsten carbide powder, nickel powder, boron powder, rhenium powder, zirconium carbide powder, and zirconium oxide powder into a planetary ball mill and grind for 24 hours to obtain mixed powder A;

[0066] 6) The polyimide toughened polyphthalonitrile resin composition solution, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate and mixed powder A were placed in a three-dimensional motion mixer and mixed for 8 hours, and then placed in a powder dryer and dried for 8 hours to obtain mixed powder B.

[0067] 7) Place the mixed powder B in a high-speed mixer to homogenize for 4 hours, then mix and plasticize it through a twin-screw extruder, and finally press and crush it through a cooling tablet press to obtain mixed powder C;

[0068] 8) Place the mixed powder C into a micro-grinding system for 8 hours to obtain a nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating.

[0069] The nano-deposited heavy-duty anti-corrosion graphene composite nano-ceramic coating was uniformly applied to the surface of a high-temperature industrial furnace using an electrostatic spraying method. The baking temperature was 360℃ and the baking time was 60 minutes.

[0070] The effects of the examples are shown in Tables 3-4.

[0071] Table 3

[0072]

[0073]

[0074] Table 4

[0075]

[0076]

[0077] Note: In Comparative Example 1, the weight parts of the two monomers, 4 / 3-(4-hydroxybiphenoxy)phthalonitrile and resorcinol-bisphenol ketone bisphthalonitrile, were interchanged, resulting in a lower content of resorcinol-bisphenol ketone bisphthalonitrile, uneven dispersion of the coating, and a significant reduction in its corrosion resistance, high temperature resistance, and other properties.

[0078] The above performance testing methods are as follows:

[0079]

[0080] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A nano-deposited, heavy-duty anti-corrosion graphene composite nano-coating, characterized in that, The product is composed of the following components in parts by weight: 66-82 parts of polyimide-toughened polyphthalonitrile resin composition solution; 1-2 parts of nano-calcium silicate; 1-2 parts of nano-silicon nitride; 1-2 parts of graphene; 3-5 parts of 1,3,5-tris(trimethoxysilylpropyl)isocyanurate; 2-3 parts of lead powder; 1-2 parts of chromium carbide powder; 1-2 parts of tungsten powder; 1-2 parts of cobalt powder; 1-2 parts of silicon carbide; 1-2 parts of tungsten carbide powder; 1-2 parts of nickel powder; 1-2 parts of boron powder; 1-2 parts of rhenium powder; 1-2 parts of zirconium carbide powder; and 1-2 parts of zirconium oxide powder.

2. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 1, characterized in that, The preparation method of the polyimide-toughened polyphthalonitrile resin composition solution is as follows: (1) Preparation of polyphthalonitrile resin 15-25 parts by weight of 4 / 3-(4-hydroxybiphenoxy)phthalonitrile, 10-15 parts by weight of diphenyl ether diphenol-polyarylene ether nitrile, and 60-70 parts by weight of resorcinol-bisphenol ketone bisphthalonitrile were added to 100-150 parts by weight of ethanol and dispersed evenly. The mixture was heated to 180-195℃ and stirred. The solvent was removed under reduced pressure to obtain the mixture. The mixture was then heated to solidify. (2) Preparation of polyimide-toughened polyphthalonitrile resin composition solution Diamine dinitrile and m-phenylenediamine were added to N-methylpyrrolidone. After complete dissolution, 3,3',4,4'-biphenyl dianhydride was added to the clear solution and stirred at room temperature to obtain a polyimide resin solution containing cyano functional groups. The polyphthalonitrile resin obtained in step (1) was added to the polyimide resin solution containing cyano functional groups and stirred until the solution was clear to obtain a polyimide toughened polyphthalonitrile resin composition solution.

3. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 2, characterized in that, In step (1), the mixture is heated and cured according to the following procedure: 200-210℃ for 4-5 hours; 270-290℃ for 2-3 hours; 330-360℃ for 5-6 hours; 400-410℃ for 2-3 hours; 430-450℃ for 8-9 hours to obtain polyphthalic nitrile resin.

4. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 2, characterized in that, In step (1), the weight ratio of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile and resorcinol-bisphenol ketone bisphthalonitrile is 1:(3-4).

5. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 1, characterized in that, In step (1), the weight ratio of 4 / 3-(4-hydroxybiphenyloxy)phthalonitrile, diphenyl ether diphenol-polyaryl ether nitrile and resorcinol-bisphenol ketone bisphthalonitrile is 20:10:

70.

6. The nano-deposited heavy-duty anti-corrosion graphene according to claim 2, characterized in that, The molecular structure of the 4 / 3-(4-hydroxybiphenoxy)phthalonitrile is as follows:

7. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 2, characterized in that, The molecular structure of the diphenyl ether diphenol-polyarylene ether nitrile is as follows:

8. The nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to claim 2, characterized in that, The molecular structure of the resorcinol-bisphenol ketone bis(phthalonitrile) is as follows:

9. The method for preparing the nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to any one of claims 1-8, characterized in that, Includes the following steps: 1) Grind nano-calcium silicate, nano-silicon nitride, graphene, lead powder, chromium carbide powder, tungsten powder, cobalt powder, silicon carbide, tungsten carbide powder, nickel powder, boron powder, rhenium powder, zirconium carbide powder, and zirconium oxide for 20-24 hours to obtain mixed powder A; 2) After mixing the polyimide toughened polyphthalonitrile resin composition solution, 1,3,5-tris(trimethoxysilylpropyl)isocyanurate and mixed powder A for 8-10 hours, the mixture is then placed in a powder dryer and dried for 8-10 hours to obtain mixed powder B. 3) Place the mixed powder B in a high-speed mixer to homogenize for 3-5 hours, then mix and plasticize it through a twin-screw extruder, and finally press and crush it through a cooling tablet press to obtain mixed powder C; 4) Place the mixed powder C into a micro-grinding system for 8-10 hours to obtain a nano-deposited heavy-duty anti-corrosion graphene composite nano-coating.

10. The application of the nano-deposited heavy-duty anti-corrosion graphene composite nano-coating according to any one of claims 1-8 in the surface treatment of high-temperature equipment metals.

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