Aluminum alloy hydrophobic anticorrosion antibacterial coating containing vanadium disulfide particles, preparation method and application

Abstract

The application discloses an aluminum alloy hydrophobic corrosion-resistant antibacterial coating containing vanadium disulfide particles and a preparation method and application thereof. The preparation method comprises the following steps: pre-treating the surface of the aluminum alloy and then performing anodic oxidation; preparing a hydrophobic corrosion-resistant antibacterial vanadium disulfide antibacterial coating: mixing epoxy resin, acetone, a curing agent and vanadium disulfide particles, and then spraying the mixture onto the anodized surface, and then grafting silane onto the hydroxyl groups of the epoxy resin; wherein the mass ratio of the sum of the mass of the epoxy resin and the mass of the curing agent to the mass of the vanadium disulfide particles is 0.5-1.8:1. The aluminum alloy hydrophobic corrosion-resistant antibacterial coating does not need special illumination conditions, and shows excellent antibacterial performance on Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa in a natural environment, and meanwhile, the aluminum alloy hydrophobic corrosion-resistant antibacterial coating also has excellent hydrophobic performance and corrosion resistance, and is particularly suitable for the corrosion prevention of aluminum alloy surfaces used in marine environments and aluminum alloy components used in buildings.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy coating technology, and in particular to a hydrophobic, anti-corrosion and antibacterial coating for aluminum alloys containing vanadium disulfide particles, its preparation method and application. Background Technology

[0002] Aluminum alloys, due to their excellent properties such as low density, good mechanical properties, good machinability, and high strength-to-weight ratio, are widely used in aerospace, automotive manufacturing, and electronic equipment. However, aluminum alloys also face some serious problems during use. Aluminum alloys are susceptible to corrosion in natural environments, especially in humid, saline, and marine environments, where the corrosion rate accelerates. The marine environment is extremely harsh, with seawater rich in salt and various microorganisms. When used in marine environments, aluminum alloys not only face corrosion from seawater but are also vulnerable to erosion by marine microorganisms. Bacteria, algae, and other microorganisms in the ocean can attach, grow, and reproduce on the surface of aluminum alloys, forming biofilms. These biofilms accelerate the corrosion process of aluminum alloys and reduce the effectiveness of anti-corrosion coatings. Corrosion, microbial attachment, and bacterial growth not only reduce the service life of aluminum alloys but may also lead to structural damage, thereby affecting the safety and reliability of equipment. Therefore, improving the corrosion resistance and antibacterial properties of aluminum alloys is particularly important. Finding aluminum alloy coatings and preparation technologies that combine antibacterial and corrosion-resistant properties has become an urgent problem to be solved. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the purpose of this invention is to provide a method for preparing a hydrophobic anti-corrosion and antibacterial coating for aluminum alloy containing vanadium disulfide particles. The prepared hydrophobic anti-corrosion and antibacterial coating for aluminum alloy does not require special light conditions and exhibits excellent antibacterial properties against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa in natural environment. At the same time, it also has excellent hydrophobic properties, which reduces the self-corrosion current density of aluminum alloy and thus improves its corrosion resistance.

[0004] Another objective of this invention is to provide a hydrophobic, corrosion-resistant, and antibacterial coating for aluminum alloys containing vanadium disulfide particles.

[0005] Another object of the present invention is to provide the application of the above-mentioned hydrophobic, anti-corrosion and antibacterial coating for aluminum alloys containing vanadium disulfide particles.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] This invention provides a method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles, comprising the following steps:

[0008] (1) The aluminum alloy is anodized after surface pretreatment;

[0009] (2) Prepare vanadium disulfide antibacterial coating on the aluminum alloy surface after step (1): Mix epoxy resin, acetone and vanadium disulfide particles; add curing agent, and ultrasonically disperse to obtain a mixed suspension. Spray the mixed suspension onto the aluminum alloy surface after step (1) and cure to obtain vanadium disulfide antibacterial coating.

[0010] The ratio of the sum of the mass of epoxy resin and curing agent to the mass of vanadium disulfide particles is 0.5 to 1.8:1; more preferably, the ratio of the sum of the mass of epoxy resin and curing agent to the mass of vanadium disulfide particles is 1 to 1.5:1.

[0011] (3) The vanadium disulfide antibacterial coating prepared in step (2) is subjected to hydrophobic treatment: the vanadium disulfide antibacterial coating prepared in step (2) is soaked in silanization solution and then cured to obtain a hydrophobic anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles.

[0012] Preferably, the vanadium disulfide particles have a layered microstructure and are prepared using the following method:

[0013] Ammonium metavanadate was dissolved in an ammonia solution and stirred to obtain a vanadium source solution; thioacetamide was dissolved in deionized water and stirred to obtain a sulfur source solution.

[0014] The vanadium source solution and the sulfur source solution are mixed and stirred for 1 to 1.5 hours. The mixture is then placed in a reaction vessel and reacted at 180 to 190°C for 12 to 18 hours. The product is washed and dried at 60 to 80°C for 7 to 9 hours. It is then ground and dried at 200 to 220°C for 20 to 40 minutes to obtain vanadium disulfide particles.

[0015] Preferably, the silanization solution is a perfluorodecyltriethoxysilane solution or a hexadecyltrimethoxysilane solution.

[0016] Preferably, the volume concentration of the silanization solution is 1.5-2.5%, and the soaking time is 1.5-2.5 h.

[0017] Preferably, the curing in step (3) is specifically: heating and curing at 110-130℃ for 2-4 hours.

[0018] Preferably, the anodizing process described in step (1) specifically includes:

[0019] An anodizing electrolyte containing 100–200 g / L sulfuric acid and 1.5–6 g / L oxalic acid was prepared. The aluminum alloy was fixed as the anode in the anodizing electrolytic cell containing the electrolyte. The electrolysis voltage was set to 12–24 V and the electrolysis temperature to 20–30 °C. Anodizing was started and stopped after 10–40 min. After anodizing, the aluminum alloy sample was washed with anhydrous ethanol and deionized water, respectively, and finally dried to obtain the anodized aluminum alloy.

[0020] Preferably, the surface pretreatment in step (1) specifically involves: polishing the aluminum alloy surface with sandpaper of grits of 400#, 600#, and 1000# respectively until the surface of the sample is smooth and there are no obvious scratches; then ultrasonically cleaning the sample with sodium hydroxide, nitric acid, anhydrous ethanol, and deionized water in sequence, and then drying it.

[0021] The present invention also provides a hydrophobic anti-corrosion and antibacterial coating for aluminum alloy containing vanadium disulfide particles, comprising, in sequence, an anodic oxide layer and a hydrophobic vanadium disulfide antibacterial coating disposed on the surface of the aluminum alloy.

[0022] The hydrophobic vanadium disulfide antibacterial coating is obtained by spraying a mixture of epoxy resin, acetone, curing agent and vanadium disulfide particles onto an anodized surface, and then grafting silane onto the hydroxyl groups of the epoxy resin.

[0023] The ratio of the sum of the masses of the epoxy resin and curing agent to the mass of the vanadium disulfide particles is 0.5 to 1.8:1.

[0024] The present invention also provides the application of the aforementioned hydrophobic, anti-corrosion and antibacterial coating for aluminum alloys containing vanadium disulfide particles, for corrosion protection of aluminum alloy surfaces used in marine environments and aluminum alloy components used in buildings.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] (1) The method for preparing the hydrophobic, anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles of the present invention involves mixing epoxy resin, acetone and the prepared vanadium disulfide particles, adding a curing agent and spraying the mixture evenly onto the surface of the anodized aluminum alloy, so that the aluminum alloy surface exhibits excellent antibacterial properties against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa under natural environment without special light conditions; since the hydrophobicity of the aluminum alloy surface is reduced after coating, the coating is modified by silanization by immersion using a silanization solution to improve its hydrophobicity and improve the anti-corrosion performance of the aluminum alloy surface with a slight sacrifice of antibacterial performance.

[0027] (2) The method for preparing the hydrophobic, anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles of the present invention involves selecting appropriate raw materials, proportions and controlling reaction conditions, and using a hydrothermal synthesis method to prepare antibacterial vanadium disulfide particles with a layered structure similar to petals. The preparation process is simple.

[0028] (3) The method for preparing the hydrophobic anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles of the present invention uses a silanization solution to immerse the coating in silanization modification treatment. After silane hydrolysis, it is grafted with the hydroxyl groups of epoxy resin. The formed hydrocarbon chains and Si-O-Si network reduce the surface energy of the resin. Furthermore, the coating surface has a well-layered micro-nano structure. The combined effect of these two structures improves the water contact angle of the coating, overcoming the problem that it is difficult to improve the water contact angle of the coating by hydrophobic modification of vanadium disulfide particles.

[0029] (4) The method for preparing the hydrophobic, anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles of the present invention uses anodizing technology to pretreat the surface of aluminum alloy, thereby improving the anti-corrosion performance of aluminum alloy and providing a substrate surface with suitable roughness for subsequent coating spraying.

[0030] (5) The method for preparing the aluminum alloy hydrophobic anti-corrosion and antibacterial coating containing vanadium disulfide particles of the present invention is to prepare the aluminum alloy antibacterial coating by combining anodic oxidation surface treatment technology with vanadium disulfide hydrothermal synthesis technology and spraying process, and to use silane to modify the coating hydrophobically. The method is simple and low cost.

[0031] (6) The aluminum alloy hydrophobic anti-corrosion and antibacterial coating containing vanadium disulfide particles of the present invention effectively improves the hydrophobicity, anti-corrosion and antibacterial properties of aluminum alloys, and the antibacterial properties do not depend on special light exposure, making it particularly suitable for the anti-corrosion of aluminum alloy surfaces used in marine environments and aluminum alloy components used in buildings. Attached Figure Description

[0032] Figure 1 The image shows the XRD pattern of vanadium disulfide particles prepared in Example 1 of this invention.

[0033] Figure 2 This is a SEM image of vanadium disulfide particles prepared in Example 1 of the present invention.

[0034] Figure 3 SEM image of the hydrophobic, anti-corrosion, and antibacterial coating prepared in Example 1 of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0036] Example 1

[0037] 1. Anodizing treatment of aluminum alloy surface

[0038] 1.1 Aluminum Alloy Pretreatment: The aluminum alloy surface was polished with 400#, 600#, and 1000# sandpaper respectively until the surface of the sample became smooth and there were no obvious scratches. The sample was then ultrasonically cleaned sequentially with sodium hydroxide, nitric acid, anhydrous ethanol, and deionized water, and then dried.

[0039] 1.2 Anodizing: Prepare an anodizing electrolyte containing 150 g / L sulfuric acid and 4.5 g / L oxalic acid, and pour the electrolyte into the anodizing electrolytic cell. Fix the aluminum alloy as the anode in the anodizing electrolytic cell containing the electrolyte, set the electrolysis voltage to 20 V and the electrolysis temperature to 25 °C, and start the anodizing treatment. Stop the anodizing after 30 min.

[0040] 1.3 Post-treatment: After anodizing, the aluminum alloy samples were washed with anhydrous ethanol and deionized water respectively, and finally dried to obtain anodized aluminum alloy.

[0041] 2. Preparation of vanadium disulfide particles

[0042] 2.1 Dissolve 1g of ammonium metavanadate (NH4VO3) in an ammonia solution and stir.

[0043] 2.2 Dissolve 5g of thioacetamide (C2H5NS) in deionized water and stir.

[0044] 2.3 Mix the two solutions and stir for 1 hour. Transfer the mixture to a 100 mL Teflon-lined stainless steel reactor. Then place the Teflon-lined stainless steel reactor in an oven at 185 °C and maintain the temperature for 15 hours.

[0045] 2.4 After the reactor is cooled, the product is taken out, centrifuged with deionized water and ethanol and repeatedly washed to remove impurities, and then dried in an oven at 75°C for 8 hours.

[0046] 2.5 Remove and grind the material, then place it in a 210℃ oven to dry for 0.5 hours to further decompose and remove excess impurities. Vanadium disulfide particles are finally obtained.

[0047] 3. Preparation of Vanadium Disulfide Antibacterial Coating

[0048] 3.1 Mix 0.33g epoxy resin (E44), 0.33g acetone, and 1g vanadium disulfide particles at 250r / min for 3h.

[0049] 3.2 Add 1g of curing agent (MHHPA) and ultrasonically disperse for 10min to obtain a mixed suspension with better dispersibility.

[0050] 3.3 The mixed suspension was sprayed onto the anodized aluminum alloy surface using a spray gun, and then placed in an oven at 120°C for 3 hours to cure, thus obtaining a vanadium disulfide antibacterial coating.

[0051] 4. Hydrophobic modification

[0052] 4.1 The vanadium disulfide antibacterial coating is subjected to hydrophobic treatment by immersing the aluminum alloy antibacterial coating in a silanization solution containing 2 (V / V)% perfluorodecyltriethoxysilane for 2 hours.

[0053] 4.2 Heating and curing at 120℃ for 2 hours yields a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloy containing vanadium disulfide particles.

[0054] Example 2

[0055] In this embodiment, except that during the hydrophobic modification stage, the silanization solution was changed from 2 (V / V)% perfluorodecyltriethoxysilane to 2 (V / V)% hexadecyltrimethoxysilane, the other conditions were the same as in Example 1.

[0056] Comparative Example 1

[0057] This comparative example is an untreated aluminum alloy.

[0058] Comparative Example 2

[0059] This comparative example is an anodized aluminum alloy, and the treatment steps are the same as those for the anodized aluminum alloy surface in Example 1.

[0060] Comparative Example 3

[0061] This comparative example is a vanadium disulfide antibacterial coating, which is prepared using the same method as the aluminum alloy surface anodizing treatment, vanadium disulfide particle preparation, and vanadium disulfide antibacterial coating preparation steps in Example 1, but without the hydrophobic modification step.

[0062] Test results:

[0063] Material characterization - XRD

[0064] The XRD pattern of the vanadium disulfide particles synthesized in Example 1 is shown below. Figure 1 As shown, the diffraction peaks at 2θ = 15.4°, 35.8°, 45.2°, 57.1°, 58.2°, 59.6°, 69.2°, and 75.7° correspond to vanadium disulfide standard cards (001), (011), (012), (110), (103), (111), (201), and (202), respectively (refer to standard card JCPDS 01-089-1640). This indicates that pure vanadium disulfide particles were successfully synthesized.

[0065] Material characterization - SEM

[0066] SEM image of the vanadium disulfide particles synthesized in Example 1 is shown below. Figure 2 As shown, the synthesized vanadium disulfide particles have a layered structure similar to flower petals.

[0067] SEM image of the hydrophobic, anti-corrosion, and antibacterial coating prepared in Example 1 is shown below. Figure 3 As shown, the prepared vanadium disulfide particles are tightly bonded to the resin and silane. The hydrophobic, anti-corrosion, and antibacterial coating exhibits a highly packed micro / nano layered structure, indicating that the mixture of vanadium disulfide and resin, along with the hydrophobic modification of the coating by silane, results in a stable structure, uniform morphology, and evenly distributed size. Two key conditions for achieving hydrophobicity are low surface energy and high roughness. The highly packed micro / nano layered structure provides favorable conditions for high roughness, thus improving the hydrophobic properties of the coating.

[0068] Antibacterial performance test:

[0069] Using common bacteria such as Staphylococcus aureus and Escherichia coli, as well as Pseudomonas aeruginosa (one of the major marine bacteria), as bacterial strains, the plate coating method was used for colony counting. Anodized aluminum alloy was used as a blank control to evaluate the antibacterial properties of the coating. The experiment was conducted without special lighting. The specific procedures are as follows:

[0070] The bacterial suspension was serially diluted, with 50 μL of each diluted suspension added to the blank control plate and the surface of the test coating. The plates were covered with sterile film and incubated at 37°C for 24 hours. The blank control plate and the test coating were then rinsed with a PBS buffer solution of a specific concentration. The eluent was collected, serially diluted, and evenly spread onto solid culture medium. The plates were incubated at 37°C for 24 hours. After incubation, the surface colonies were observed and counted, and the antibacterial rate was calculated. The antibacterial rate formula is as follows:

[0071] R = (BA) / B × 100%

[0072] R-Antibacterial rate

[0073] B - Colony count in blank control plate

[0074] A - Colony count of the coating to be tested

[0075] The antibacterial rates are shown in Table 1. As can be seen from the table, the vanadium disulfide antibacterial coating achieved an antibacterial rate of over 98% against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa, indicating that even without special light exposure, the addition of vanadium disulfide has a very significant antibacterial effect against these three bacteria. However, the antibacterial coatings treated with hydrophobic corrosion protection (Examples 1 and 2) showed a slight decrease in antibacterial rate, but both still reached over 91%. This is because the surface of the antibacterial coating after hydrophobic corrosion protection treatment is covered with a hydrophobic layer, reducing the amount of antibacterial agent in contact with bacteria, thus decreasing the antibacterial performance. This further indicates that the antibacterial performance of the coating mainly comes from vanadium disulfide.

[0076] Table 1 shows the antibacterial properties of aluminum alloy surfaces in Comparative Examples 2-3 and Examples 1-2.

[0077]

[0078] Hydrophobic properties:

[0079] The water contact angle can be used to evaluate the hydrophobic properties of a coating. The higher the water contact angle, the better the hydrophobic properties. When the contact angle is <90°, it is partially wetted or wetted, and is hydrophilic; when the contact angle is =90°, it is the boundary between wetting and non-wetting; when the contact angle is >90°, it is non-wetting, and is hydrophobic.

[0080] The hydrophobic properties of untreated aluminum alloys, anodized aluminum alloys, vanadium disulfide antibacterial coatings, and the hydrophobic anti-corrosion and antibacterial coatings prepared in this invention (using 2(V / V)% perfluorodecyltriethoxysilane and 2(V / V)% hexadecyltrimethoxysilane as hydrophobic modifiers, respectively) are shown in Table 2. Deionized water was used for the tests. Therefore, it can be seen that the water contact angle of untreated aluminum alloy is <90°, indicating hydrophilicity; the water contact angle of anodized aluminum alloy is >90°, indicating hydrophobicity; however, the water contact angle of the vanadium disulfide antibacterial coating after spraying vanadium disulfide particles onto the surface of anodized aluminum alloy is <90°, which is lower than that of the anodized aluminum alloy, and it also shows hydrophilicity. Therefore, it is necessary to modify the vanadium disulfide antibacterial coating with silane hydrophobicity. The coatings of Examples 1 and 2, which use 2 (V / V)% perfluorodecyltriethoxysilane and 2 (V / V)% hexadecyltrimethoxysilane as hydrophobic modifying agents, respectively, show a significant increase in water contact angle compared to the aforementioned samples.

[0081] A water contact angle greater than 90° indicates hydrophobicity, suggesting that hydrophobic modification of the coating improves its hydrophobic properties. After hydrolysis, silane grafts onto the hydroxyl groups of the epoxy resin, forming hydrocarbon chains and a Si-O-Si network, which lowers the resin's surface energy. Furthermore, the coating surface exhibits a well-defined, layered micro / nano structure. The combined effect of these two structures enhances the coating's water contact angle.

[0082] Table 2 Comparison of hydrophobic properties

[0083]

[0084]

[0085] Corrosion resistance:

[0086] Self-corrosion current density is one of the important indicators reflecting the corrosion resistance of a material; the lower the self-corrosion current density, the better the corrosion resistance. Table 3 shows the self-corrosion current density test data for various materials. As can be seen from the table, the self-corrosion current density of untreated aluminum alloy is on the order of 10. -6 After anodizing, the self-corrosion current density of aluminum alloys decreases by three orders of magnitude; vanadium disulfide antibacterial coating further reduces the self-corrosion current density by one order of magnitude; and hydrophobic anti-corrosion and antibacterial coating modified with silane further reduces the self-corrosion current density by two orders of magnitude, reaching 10. -12 This indicates that the hydrophobic, anti-corrosion, and antibacterial coating of the aluminum alloy of the present invention has a very significant effect on improving the corrosion resistance of the aluminum alloy.

[0087] Table 3 Corrosion Resistance

[0088] Comparative Example 1: Untreated aluminum alloy <![CDATA[1.815×10 -6 ]]> Anodized aluminum alloy of Comparative Example 2 <![CDATA[3.381×10 -9 ]]> Comparative Example 3: Vanadium disulfide antibacterial coating <![CDATA[6.348×10 -10 ]]> Hydrophobic, anti-corrosion, and antibacterial coating of Example 1 <![CDATA[9.253×10 -12 ]]> Hydrophobic, anti-corrosion, and antibacterial coating of Example 2 <![CDATA[8.340×10 -12 ]]>

[0089] In summary, the aluminum alloy coating prepared by this invention exhibits significant antibacterial properties under conditions without special light exposure, while also possessing excellent hydrophobic and anti-corrosion properties. It is a multifunctional coating that can be applied to the antibacterial and anti-corrosion applications of aluminum alloy surfaces, and is particularly suitable for the anti-corrosion of aluminum alloy surfaces used in marine environments and aluminum alloy components used in buildings.

[0090] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the embodiments described above. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles, characterized in that, Includes the following steps: (1) The aluminum alloy is anodized after surface pretreatment; (2) Prepare vanadium disulfide antibacterial coating on the aluminum alloy surface after step (1): Mix epoxy resin, acetone and vanadium disulfide particles; add curing agent, and ultrasonically disperse to obtain a mixed suspension. Spray the mixed suspension onto the aluminum alloy surface after step (1) and cure to obtain vanadium disulfide antibacterial coating. The ratio of the sum of the masses of epoxy resin and curing agent to the mass of vanadium disulfide particles is 0.5~1.8:1; The vanadium disulfide particles have a layered structure similar to flower petals and are prepared using the following method: Ammonium metavanadate was dissolved in an ammonia solution and stirred to obtain a vanadium source solution; thioacetamide was dissolved in deionized water and stirred to obtain a sulfur source solution. After mixing the vanadium source solution and the sulfur source solution, stir for 1 to 1.5 hours, place in a reaction vessel and react at 180 to 190°C for 12 to 18 hours. After washing the product, dry it at 60 to 80°C for 7 to 9 hours, then grind it, and then dry it at 200 to 220°C for 20 to 40 minutes to obtain vanadium disulfide particles. (3) Hydrophobic treatment of the vanadium disulfide antibacterial coating prepared in step (2): The vanadium disulfide antibacterial coating prepared in step (2) is soaked in silanization solution and then cured to obtain a hydrophobic anti-corrosion and antibacterial coating of aluminum alloy containing vanadium disulfide particles.

2. The method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles according to claim 1, characterized in that, The mass ratio of the epoxy resin to the vanadium disulfide particles is 1:(2.5~3.5).

3. The method for preparing the hydrophobic, anti-corrosion, and antibacterial coating of aluminum alloy containing vanadium disulfide particles according to claim 1, characterized in that, The silanization solution is a perfluorodecyltriethoxysilane solution or a hexadecyltrimethoxysilane solution.

4. The method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles according to claim 1, characterized in that, The volume concentration of the silanization solution is 1.5~2.5%, and the soaking time is 1.5~2.5h.

5. The method for preparing the hydrophobic, anti-corrosion, and antibacterial coating of aluminum alloy containing vanadium disulfide particles according to claim 1, characterized in that, The curing process described in step (3) specifically involves heating and curing at 110~130℃ for 2~4 hours.

6. The method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles according to claim 1, characterized in that, The anodizing process described in step (1) specifically involves: An anodizing electrolyte containing 100–200 g / L sulfuric acid and 1.5–6 g / L oxalic acid was prepared. The aluminum alloy was fixed as the anode in the anodizing electrolytic cell containing the electrolyte. The electrolysis voltage was set to 12–24 V and the electrolysis temperature to 20–30 °C. Anodizing was started and stopped after 10–40 min. After anodizing, the aluminum alloy sample was washed with anhydrous ethanol and deionized water, respectively, and finally dried to obtain the anodized aluminum alloy.

7. The method for preparing a hydrophobic, anti-corrosion, and antibacterial coating for aluminum alloys containing vanadium disulfide particles according to claim 1, characterized in that, The surface pretreatment described in step (1) is as follows: the aluminum alloy surface is polished with sandpaper of 400#, 600# and 1000# grit respectively until the surface of the sample is smooth and there are no obvious scratches. The sample is then ultrasonically cleaned with sodium hydroxide, nitric acid, anhydrous ethanol and deionized water in sequence, and then dried.

8. The application of the aluminum alloy hydrophobic anti-corrosion and antibacterial coating prepared by the method for preparing the aluminum alloy hydrophobic anti-corrosion and antibacterial coating containing vanadium disulfide particles according to any one of claims 1 to 7, characterized in that, Corrosion protection for aluminum alloy surfaces used in marine environments and aluminum alloy components used in buildings.

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