Long-acting corrosion-resistant graphene modified cold-sprayed zinc coating and preparation method thereof

Abstract

The application belongs to the technical field of cold zinc spraying coating and specifically provides a long-acting corrosion-resistant graphene modified cold zinc spraying coating and a preparation method thereof. The long-acting corrosion-resistant graphene modified cold zinc spraying coating comprises a resin liquid and modified zinc powder dispersed in the resin liquid. The resin liquid comprises water-based polyurethane, graphene, phytic acid cross-linked kaolin sol and water. The modified zinc powder comprises zinc powder and phosphate coated on the surface of the zinc powder. The cold zinc spraying coating prepared by the application has the advantages of high bonding force with a substrate and good corrosion resistance.

Description

Technical Field

[0001] This application belongs to the field of cold spray zinc coating technology, and in particular relates to a long-lasting corrosion-resistant graphene-modified cold spray zinc coating and its preparation method. Background Technology

[0002] Cold-sprayed zinc coating is a high-zinc-content anti-corrosion coating that primarily relies on the sacrificial anodic protection of zinc powder on the steel substrate and the physical shielding effect of corrosion products on the coating to provide long-lasting protection. Compared with hot-dip galvanizing, cold-sprayed zinc has advantages such as convenient construction, on-site coating capability, low energy consumption, and no workpiece size limitations. It is widely used for long-term corrosion protection of large steel structures such as bridges, power transmission towers, and offshore platforms.

[0003] Traditional cold-spray zinc coatings still face several technical bottlenecks in practical applications, with the core challenge lying in the synergy between "ultra-dispersion viscosity reduction, precise interface control, and high toughness enhancement." Specifically: 1. To achieve effective cathodic protection, zinc powder particles need to form tight electronic pathways. However, high-solids-content flake or spherical zinc powder is prone to agglomeration in the resin matrix, leading to a sharp increase in coating viscosity and deterioration in application performance. While conventional dispersants introduced to improve dispersibility can reduce viscosity, they often form an insulating adsorption layer on the zinc powder particle surface, significantly increasing coating resistance, hindering electron conduction, and sacrificing anodic protection efficiency. 2. The interfacial bonding strength between zinc powder and the resin matrix directly determines the coating's density and mechanical properties. To improve corrosion resistance life, the coating needs excellent barrier properties, but this usually requires good coating of zinc powder by the resin matrix. However, tight resin coating also hinders electronic contact between zinc powder particles, weakening the sacrificial anodic protection effect. How to enhance interfacial bonding and improve coating density while maintaining effective electrochemical conductivity is a major challenge in this field; 3. Cold-sprayed zinc coatings are usually brittle after curing, especially at low temperatures or after long-term aging, and are prone to microcracks, providing rapid penetration channels for corrosive media and leading to coating failure. Introducing toughening components can improve flexibility, but often sacrifices the barrier properties of the coating or reduces the volume fraction of zinc powder, affecting long-term anti-corrosion effects.

[0004] Against this backdrop, developing a cold-sprayed zinc coating that can simultaneously achieve low viscosity application, high interfacial bonding strength, excellent electrochemical protection, and high toughness is of significant practical importance. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a long-lasting, corrosion-resistant graphene-modified cold-spray zinc coating and its preparation method.

[0006] This application first provides a long-lasting, corrosion-resistant graphene-modified cold-spray zinc coating, comprising a resin liquid and modified zinc powder dispersed in the resin liquid; The resin solution comprises aqueous polyurethane, graphene, phytic acid crosslinked kaolin sol, and water; The modified zinc powder comprises zinc powder and phosphate coated on the surface of the zinc powder.

[0007] Furthermore, the mass ratio of the resin liquid to the modified zinc powder is 1:(3.5-5).

[0008] Furthermore, the phytic acid crosslinked kaolin sol is prepared by a method including the following steps: mixing metakaolin with water and ball milling to form a slurry, adjusting the pH to 9.5-10.5 with alkali for activation to obtain an active liquid; then adding phytic acid solution dropwise to the active liquid under stirring, maintaining the pH of the reaction system at 8.5-9.5, continuing stirring after the addition is complete, and finally adjusting the pH to 6.5-7.5 to obtain the final product.

[0009] Furthermore, the concentration of the phytic acid solution is 30-70 g / L.

[0010] Furthermore, the modified zinc powder is prepared by a method comprising the following steps: 1) Dissolve κ-carrageenan in water, adjust the pH to 3.5-4.5 with acid, and then treat it at 100-120℃ and 0.3-0.7MPa for 0.5-2h. Centrifuge and collect the supernatant for later use. 2) Mix the supernatant, water, soluble calcium salt and soluble zinc salt to prepare a base solution, wherein the calcium ion concentration in the base solution is 1.5-4 mmol / L and the zinc ion concentration is 3-8 mmol / L; 3) Add zinc powder to the base solution, mix well, add dipotassium hydrogen phosphate solution while stirring, adjust the pH to 6.5-7.5, continue stirring, and finally obtain the product after solid-liquid separation, drying and pulverization.

[0011] Furthermore, in step 3), the mass-to-volume ratio of zinc powder to base liquid is (1.2-2) kg: 1 L.

[0012] Furthermore, in step 3), the concentration of the dipotassium hydrogen phosphate solution is 2.5-5 mmol / L.

[0013] Furthermore, the amount of graphene added is 10-20% of the mass of the waterborne polyurethane.

[0014] Furthermore, the resin liquid also contains at least one additive selected from defoamers, wetting agents, anti-settling agents, and rust inhibitors.

[0015] This application also provides a method for preparing a long-lasting corrosion-resistant graphene-modified cold-spray zinc coating, comprising the following steps: mixing the components of the resin liquid evenly to obtain a resin liquid; adding the modified zinc powder to the resin liquid under stirring and dispersing at high speed to obtain the final product.

[0016] Compared with the prior art, this application has the following beneficial effects: 1. This application utilizes κ-carrageenan, which, after acid degradation, forms small molecular chains. These small carrageenan molecular chains adsorb onto the surface of zinc powder particles, providing sites for subsequent inorganic mineralization. When dipotassium hydrogen phosphate solution is added, phosphate ions co-precipitate in situ with calcium and zinc ions in the base solution under the mediation of these sites, forming amorphous calcium phosphate / zinc phosphate coatings on the zinc powder surface. This significantly reduces zinc powder agglomeration, improves the dispersion uniformity of zinc powder in the coating system, enhances the adhesion between the coating and the substrate, and increases the density of the coating. Furthermore, it acts as a shield for zinc powder to some extent, reducing the initial reactivity of the zinc powder and improving the coating's impedance and corrosion resistance.

[0017] 2. This application uses metakaolin activated with alkali to form a sol precursor. Multiple phosphate groups of phytic acid molecules coordinate with aluminum and silicon sites in the metakaolin sol through hydrogen bonding to form a sol. This sol is uniformly distributed throughout the coating system. Its aluminosilicate and phytic acid phosphate groups can chelate with calcium and zinc on the surface of the amorphous calcium phosphate / zinc phosphate coating layer, forming a protective film through physical filling and chemical bonding. This inhibits early anodic dissolution and the gradual disintegration of the coating layer in the later stages, resulting in long-term corrosion resistance. Furthermore, the released phytic acid molecules can chelate with zinc ions, further reducing the corrosion rate of zinc powder. In addition, graphene is introduced into the coating system. Graphene can be uniformly dispersed between modified zinc powder particles, enhancing the conductive pathways between zinc powder particles and improving the cathodic protection effect of the coating. It can also fill the pores in the coating, improving its density and physical shielding performance, significantly enhancing the mechanical properties and toughness of the coating. Attached Figure Description

[0018] Figure 1 The images show the sample coating impedance data of Examples 1-2 and Control Groups 1-2 of this application.

[0019] Figure 2 This is a SEM image of the modified zinc powder of Example 1 of this application.

[0020] Figure 3 This is a schematic diagram of the EDS of the modified zinc powder in Example 1 of this application. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] When using “including,” “having,” and “contains” as described herein, the intention is to cover non-exclusive inclusion, unless an explicit qualifying term such as “only,” “consisting of,” etc., is used, in which case another component may be added.

[0024] The terms "preferred," "more preferably," "better," and "even better" used in this application refer to embodiments of this application that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this application. That is, in this application, "preferred," "more preferably," "better," and "even better" are merely descriptions of implementations or embodiments with better effects, but do not constitute a limitation on the scope of protection of this application.

[0025] In this application, terms such as "further," "even more," and "particularly" are used for descriptive purposes and to indicate differences in content, but should not be construed as limiting the scope of protection of this application.

[0026] In this application, "at least one" means one or more, such as one, two, or more. "Multiple" or "several" means at least two, such as two, three, etc., and "multi-layered" means at least two layers, such as two layers, three layers, etc., unless otherwise explicitly specified. In the description of this application, "several" means at least one, such as one, two, etc., unless otherwise explicitly specified.

[0027] When a numerical range is disclosed herein, the range is considered continuous and includes the minimum and maximum values ​​of the range, as well as every value between the minimum and maximum values. Furthermore, when the range refers to integers, it includes every integer between the minimum and maximum values ​​of the range. Additionally, when multiple ranges are provided to describe a feature or characteristic, the ranges may be combined. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all subranges to which they are incorporated.

[0028] Unless otherwise specified, all steps in this application may be performed sequentially or randomly. For example, the method comprising steps (a) and (b) indicates that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0029] The present application will be further illustrated by the following examples, but these examples do not limit the scope of the present application.

[0030] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise stated in this application, both endpoints of each numerical range and any value between the two endpoints may be selected. Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. All reagents or instruments whose manufacturers are not specified are conventional products that can be purchased commercially. In addition to the specific methods, equipment, and materials used in the embodiments, based on the knowledge of the prior art possessed by one of ordinary skill in the art and the description in this application, any prior art methods, equipment, and materials similar to or equivalent to those described, used, or made by the methods, equipment, and materials in the embodiments of this application may be used to implement this application.

[0031] Example 1: The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating of this example includes resin liquid and modified zinc powder, with a mass ratio of resin liquid to modified zinc powder of 1:4.

[0032] The resin solution comprises the following components by weight: 550g of waterborne polyurethane, 350g of deionized water, 60g of graphene, 35g of phytic acid crosslinked kaolin sol, 1.5g of defoamer, 30g of wetting agent, 20g of anti-settling agent, 15g of rust inhibitor, and 10g of curing agent.

[0033] Among them, the waterborne polyurethane is model F0401, manufactured by Shenzhen Yoshida Chemical Co., Ltd. The defoamer is model BYK028. The wetting agent is model BYK348. The anti-settling agent is model JC609. The rust inhibitor is model HD-600. The curing agent is model 2655, also manufactured by Shenzhen Yoshida Chemical Co., Ltd.

[0034] Phytic acid crosslinked kaolin sol was prepared by the following steps: 1 L of deionized water and 300 g of metakaolin were mixed evenly and then ball-milled for 5 h. The resulting ball-milled slurry was adjusted to pH 10.0 with sodium hydroxide and stirred for 2 h to obtain an active solution. 100 mL of 50 g / L phytic acid solution was slowly added dropwise to the active solution at a rate of 2 mL / min. After the addition was complete, stirring was continued for 2 h, maintaining the pH value between 9.0 and 9.5. Finally, the pH value was adjusted to 7.0 with 1 mol / L hydrochloric acid solution, resulting in a solid content of approximately 30%.

[0035] The preparation method of modified zinc powder includes the following steps: 1) Dissolve 5g of κ-carrageenan in 500mL of deionized water at 80℃, then adjust the pH to 4.0 with acetic acid, and then treat at 110℃ and 0.5MPa for 1h. Centrifuge to obtain the supernatant. 2) Mix 1.5L of deionized water and 75mL of supernatant evenly, then add calcium chloride and zinc chloride, mix evenly to obtain the base solution, and control the concentration of calcium ions in the base solution to be 2.5mmol / L and the concentration of zinc ions to be 5mmol / L. 3) Add 1.5 kg of spherical zinc powder with an average particle size of 10 μm to 1 L of base solution, mix well, then add an equal volume of dipotassium hydrogen phosphate solution with a concentration of 3.5 mmol / L to the base solution, adjust the pH to 7.0, stir at 1000 rpm for 15 min, filter, dry and pulverize to obtain the final product.

[0036] The preparation method of the long-lasting corrosion-resistant graphene-modified cold spray zinc coating in this embodiment includes the following steps: the components of the resin liquid are first mixed at a low speed of 150 rpm for 10 min, and then dispersed at a speed of 1000 rpm for 50 min to obtain the resin liquid; the modified zinc powder is added to the resin liquid at a stirring speed of 800 rpm and dispersed at a high speed for 20 min to obtain the final product.

[0037] Example 2: The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating of this example includes resin liquid and modified zinc powder, with a mass ratio of resin liquid to modified zinc powder of 1:5.

[0038] The resin solution comprises the following components by weight: 550g of waterborne polyurethane, 350g of deionized water, 60g of graphene, 50g of phytic acid crosslinked kaolin sol, 1.5g of defoamer, 30g of wetting agent, 20g of anti-settling agent, and 15g of rust inhibitor.

[0039] Phytic acid crosslinked kaolin sol was prepared by the following steps: 1 L of deionized water and 300 g of metakaolin were mixed evenly and then ball-milled for 5 h. The resulting ball-milled slurry was adjusted to pH 10.0 with sodium hydroxide and stirred for 2 h to obtain an active solution. 100 mL of 50 g / L phytic acid solution was slowly added dropwise to the active solution at a rate of 2 mL / min. After the addition was complete, stirring was continued for 2 h, maintaining the pH value between 9.0 and 9.5. Finally, the pH value was adjusted to 7.0 with 1 mol / L hydrochloric acid solution, resulting in a solid content of approximately 30%.

[0040] The preparation method of modified zinc powder includes the following steps: 1) Dissolve 5g of κ-carrageenan in 500mL of deionized water at 80℃, then adjust the pH to 4.0 with acetic acid, and then treat at 110℃ and 0.5MPa for 1h. Centrifuge to obtain the supernatant. 2) Mix 1.5L of deionized water and 75mL of supernatant evenly, then add calcium chloride and zinc chloride, mix evenly to obtain the base solution, and control the concentration of calcium ions in the base solution to be 2.5mmol / L and the concentration of zinc ions to be 5mmol / L. 3) Add 1.5 kg of spherical zinc powder with an average particle size of 10 μm to 1 L of base solution, mix well, then add an equal volume of dipotassium hydrogen phosphate solution with a concentration of 3.5 mmol / L to the base solution, adjust the pH to 7.0, stir at 1000 rpm for 15 min, filter, dry and pulverize to obtain the final product.

[0041] The preparation method of the long-lasting corrosion-resistant graphene-modified cold spray zinc coating in this embodiment includes the following steps: the components of the resin liquid are first mixed at a low speed of 150 rpm for 10 min, and then dispersed at a speed of 1000 rpm for 50 min to obtain the resin liquid; the modified zinc powder is added to the resin liquid at a stirring speed of 800 rpm and dispersed at a high speed for 20 min to obtain the final product.

[0042] Control group 1: The cold spray zinc coating in this control group consists of resin liquid and modified zinc powder, with a mass ratio of resin liquid to modified zinc powder of 1:4.

[0043] The resin solution comprises the following components by weight: 550g of waterborne polyurethane, 350g of deionized water, 60g of graphene, 1.5g of defoamer, 30g of wetting agent, 20g of anti-settling agent, and 15g of rust inhibitor.

[0044] The preparation method of modified zinc powder includes the following steps: 1) Dissolve 5g of κ-carrageenan in 500mL of deionized water at 80℃, then adjust the pH to 4.0 with acetic acid, and then treat at 110℃ and 0.5MPa for 1h. Centrifuge to obtain the supernatant. 2) Mix 1.5L of deionized water and 75mL of supernatant evenly, then add calcium chloride and zinc chloride, mix evenly to obtain the base solution, and control the concentration of calcium ions in the base solution to be 2.5mmol / L and the concentration of zinc ions to be 5mmol / L. 3) Add 1.5 kg of spherical zinc powder with an average particle size of 10 μm to 1 L of base solution, mix well, then add an equal volume of dipotassium hydrogen phosphate solution with a concentration of 3.5 mmol / L to the base solution, adjust the pH to 7.0, stir at 1000 rpm for 15 min, filter, dry and pulverize to obtain the final product.

[0045] The preparation method of the long-lasting corrosion-resistant graphene-modified cold-spray zinc coating in this control group includes the following steps: the components of the resin liquid are first mixed at a low speed of 150 rpm for 10 min, and then dispersed at a speed of 1000 rpm for 50 min to obtain the resin liquid; the modified zinc powder is added to the resin liquid at a stirring speed of 800 rpm and dispersed at a high speed for 20 min to obtain the final product.

[0046] Control group 2: The cold spray zinc coating in this control group consists of resin liquid and modified zinc powder, with a mass ratio of resin liquid to modified zinc powder of 1:4.

[0047] The resin solution comprises the following components by weight: 550g of waterborne polyurethane, 60g of graphene, 350g of deionized water, 35g of phytic acid crosslinked kaolin sol, 1.5g of defoamer, 30g of wetting agent, 20g of anti-settling agent, and 15g of rust inhibitor.

[0048] Phytic acid crosslinked kaolin sol was prepared by the following steps: 1 L of deionized water and 300 g of metakaolin were mixed evenly and then ball-milled for 5 h. The resulting ball-milled slurry was adjusted to pH 10.0 with sodium hydroxide and stirred for 2 h to obtain an active solution. 100 mL of 50 g / L phytic acid solution was slowly added dropwise to the active solution at a rate of 2 mL / min. After the addition was complete, stirring was continued for 2 h, maintaining the pH value between 9.0 and 9.5. Finally, the pH value was adjusted to 7.0 with 1 mol / L hydrochloric acid solution, resulting in a solid content of approximately 30%.

[0049] The preparation method of modified zinc powder includes the following steps: 1) Dissolve 5g of κ-carrageenan in 500mL of deionized water at 80℃, then adjust the pH to 4.0 with acetic acid, and then treat at 110℃ and 0.5MPa for 1h. Centrifuge to obtain the supernatant. 2) Mix 1.5L of deionized water and 75mL of supernatant evenly to prepare the base solution; 3) Add 1.5 kg of spherical zinc powder with an average particle size of 10 μm to 1 L of base liquid, stir for 15 min, filter, dry and pulverize to obtain the final product.

[0050] The preparation method of the long-lasting corrosion-resistant graphene-modified cold-spray zinc coating in this control group includes the following steps: the components of the resin liquid are first mixed at a low speed of 150 rpm for 10 min, and then dispersed at a speed of 1000 rpm for 50 min to obtain the resin liquid; the modified zinc powder is added to the resin liquid at a stirring speed of 800 rpm and dispersed at a high speed for 20 min to obtain the final product.

[0051] Performance testing 1. Take a 120mm×50mm×0.3mm tinplate substrate and spray it with the coatings of Examples 1-2 and Control Groups 1-2. The dry film thickness is 25±3μm. The adhesion of the paint film is tested according to GB 5210-2006; the resistance to neutral salt spray is tested according to GB / T 1771-2023. The test results are shown in Table 1.

[0052] Table 1. Coating test data for Examples 1-2 and Control Groups 1-2

[0053] 2. Take a 120mm×50mm×0.3mm tinplate substrate, then spray it with the coatings from Examples 1-2 and Control Groups 1-2, with a dry film thickness of 25±3μm. Immerse it in a 3.5% sodium chloride solution for EIS testing, and measure the impedance of the sample after 24 hours of immersion. The test results are as follows: Figure 1 As shown.

[0054] 3. The modified zinc powder from Example 1 was subjected to SEM and EDS tests. The test results are as follows: Figure 2 and Figure 3 As shown.

[0055] Analysis Table 1 and Figures 1-3 As can be seen, the modified zinc powder of this application is uniformly coated with a calcium phosphate / zinc phosphate deposition layer, which can effectively reduce the initial zinc powder activity, improve the density and resistance of the coating, and has longer corrosion resistance and substrate adhesion, making it suitable for anti-corrosion spraying on various metal substrates.

[0056] Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A long-lasting, corrosion-resistant graphene-modified cold-spray zinc coating, characterized in that: It comprises a resin liquid and modified zinc powder dispersed in the resin liquid; The resin solution comprises aqueous polyurethane, graphene, phytic acid crosslinked kaolin sol, and water; The modified zinc powder comprises zinc powder and phosphate coated on the surface of the zinc powder.

2. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 1, characterized in that: The mass ratio of the resin liquid to the modified zinc powder is 1:(3.5-5).

3. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 1, characterized in that: The phytic acid crosslinked kaolin sol is prepared by a method including the following steps: kaolin and water are mixed and ball-milled into a slurry; the pH is adjusted to 9.5-10.5 with alkali for activation to obtain an active solution; then, phytic acid solution is added dropwise to the active solution under stirring, while maintaining the pH of the reaction system at 8.5-9.

5. After the addition is complete, the reaction is continued with stirring, and finally the pH is adjusted to 6.5-7.5 to obtain the final product.

4. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 3, characterized in that: The concentration of the phytic acid solution is 30-70 g / L.

5. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 1, characterized in that: The modified zinc powder is prepared by a method comprising the following steps: 1) Dissolve κ-carrageenan in water, adjust the pH to 3.5-4.5 with acid, and then treat it at 100-120℃ and 0.3-0.7MPa for 0.5-2h. Centrifuge and collect the supernatant for later use. 2) Mix the supernatant, water, soluble calcium salt and soluble zinc salt to prepare a base solution, wherein the calcium ion concentration in the base solution is 1.5-4 mmol / L and the zinc ion concentration is 3-8 mmol / L; 3) Add zinc powder to the base solution, mix well, add dipotassium hydrogen phosphate solution while stirring, adjust the pH to 6.5-7.5, continue stirring, and finally obtain the product after solid-liquid separation, drying and pulverization.

6. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 5, characterized in that: In step 3), the mass-to-volume ratio of zinc powder to base liquid is (1.2-2) kg: 1 L.

7. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 5, characterized in that: In step 3), the concentration of the dipotassium hydrogen phosphate solution is 2.5-5 mmol / L.

8. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 1, characterized in that: The amount of graphene added is 10-20% of the mass of the waterborne polyurethane.

9. The long-lasting corrosion-resistant graphene-modified cold-spray zinc coating according to claim 1, characterized in that: The resin liquid also contains at least one additive selected from defoamers, wetting agents, anti-settling agents, and rust inhibitors.

10. A method for preparing a long-lasting corrosion-resistant graphene-modified cold-spray zinc coating as described in any one of claims 1-9, characterized in that: Includes the following steps: The components of the resin solution are mixed evenly to obtain the resin solution; The modified zinc powder is added to the resin liquid under stirring and dispersed at high speed to obtain the final product.

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