Anti-corrosion and hydrophobic coatings, their preparation methods and application methods

Abstract

This invention provides an anti-corrosion and hydrophobic coating, its preparation method, and its application method. The anti-corrosion and hydrophobic coating comprises, by weight, 35-60 parts of a resin matrix, 35-65 parts of nano-sized SiO2 microspheres, 10-20 parts of micron-sized SiO2 microspheres, 4-8 parts of SiO2 nanofibers, and 0.5-3 parts of a silane coupling agent. In this anti-corrosion and hydrophobic coating, the micron-sized SiO2 microspheres embedded in the bottom layer provide micron-level roughness, while the nano-sized SiO2 microspheres contribute nano-level roughness. The SiO2 nanofibers provide a spatial stacking structure, thereby constructing a micro / nano three-dimensional spatial structure and forming numerous micropores between the microstructures. The multi-scale, multi-dimensional micro-spatial structure exhibits superhydrophobic properties. Simultaneously, the uniformly distributed nano-sized SiO2 particles are tightly bound together by the coating's encapsulation effect and the chemical bonds formed by the coupling agent, resulting in a dense coating structure that hinders water vapor penetration into the inner layer and improves corrosion resistance.

Description

Technical Field

[0001] This invention relates to the field of corrosion protection technology for metal parts on water surfaces, and more specifically, to a corrosion-resistant hydrophobic coating, its preparation method, and its application method. Background Technology

[0002] Metallic materials are a crucial component of current floating photovoltaic (PV) power plants, providing support and load-bearing for PV modules, floating structures, and other equipment. Due to the unique operating environment of floating PV power plants (located on water) and the complexity of highly corrosive aquatic waters, metallic materials are highly susceptible to corrosion, leading to component failure and impacting the safety and lifespan of the PV power plant. Therefore, effectively enhancing the corrosion resistance, stability, and lifespan of metallic components is one of the key issues in the vigorous development of near-shore and harsh-condition floating PV power plants.

[0003] Currently, the main materials used for metal components in floating photovoltaic power plants are galvanized carbon steel, stainless steel, and aluminum alloy. However, none of these metal components can meet the 25-year service life requirement for floating photovoltaic power plants operating in near-shore and harsh conditions. Summary of the Invention

[0004] The main objective of this invention is to provide an anti-corrosion and hydrophobic coating, its preparation method, and its application method, so as to solve the problem that metal parts in the prior art cannot meet the service life requirements of floating photovoltaic power stations under near-shore and harsh service conditions.

[0005] To achieve the above objectives, according to one aspect of the present invention, an anti-corrosion and hydrophobic coating is provided, comprising, by weight, 35-60 parts of resin matrix, 35-65 parts of nano-sized SiO2 microspheres, 10-20 parts of micron-sized SiO2 microspheres, 4-8 parts of SiO2 nanofibers, and 0.5-3 parts of silane coupling agent.

[0006] Furthermore, the particle size D50 of the nanoscale SiO2 microspheres is 60nm-80nm;

[0007] And / or, the particle size D50 of the micron-sized SiO2 microspheres is 0.3 μm-0.4 μm;

[0008] And / or, the aspect ratio of SiO2 nanofibers is >20;

[0009] Preferably, nano-sized SiO2 microspheres and micron-sized SiO2 microspheres are prepared by a hydrothermal method;

[0010] Preferably, SiO2 nanofibers are prepared by electrospinning.

[0011] Furthermore, the resin matrix includes any one or more of polydimethylsiloxane, polyurethane, epoxy resin and acrylic resin;

[0012] And / or, the silane coupling agent includes any one or more of KH-560, KH-550 and KH-570.

[0013] Furthermore, the anti-corrosion and hydrophobic coating also includes additives, preferably including any one or more of film-forming aids, defoamers, and diluents;

[0014] Preferably, the content of the film-forming aid is 3-6 wt% of the anti-corrosion and hydrophobic coating; preferably, the film-forming aid includes any one or more of ethylene glycol and propylene glycol.

[0015] Preferably, the content of the defoamer is 0.5-2 wt% of the anti-corrosion and hydrophobic coating, and preferably, the defoamer includes PA-311;

[0016] Preferably, the content of the diluent is 3.5-6 wt% of the anti-corrosion and hydrophobic coating, and preferably, the diluent includes any one or more of ethanol and water.

[0017] Furthermore, by weight, the anti-corrosion and hydrophobic coating comprises 0.5-3 wt% KH-560, 3-6 wt% ethylene glycol, 0.5-2 wt% PA-311, 0.5-1 wt% anhydrous ethanol and 3-5 wt% deionized water.

[0018] According to another aspect of this application, a method for preparing an anti-corrosion and hydrophobic coating as described above is provided. The method includes the following steps: Step A1, mixing nano-sized SiO2 microspheres and micron-sized SiO2 microspheres, and grinding them for the first time to obtain a micro / nano SiO2 microsphere composite powder; Step A2, mixing the micro / nano SiO2 microsphere composite powder with SiO2 nanofibers, and grinding them for the second time to obtain a SiO2 fiber / particle mixed powder; Step A3, mixing the SiO2 fiber / particle mixed powder with a silane coupling agent and a resin matrix to obtain an anti-corrosion and hydrophobic coating.

[0019] Furthermore, the first grinding is a first ball mill; preferably, the grinding media of the first ball mill is stainless steel balls;

[0020] Preferably, the diameters of the grinding media in the first ball mill are 14-16 mm, 10-12 mm, and 6-8 mm, respectively, and are mixed in a ratio of 2:2:1.

[0021] Preferably, the ball-to-material ratio in the first ball mill is 12-15:1;

[0022] Preferably, the rotation speed of the first ball mill is 400-600 r / min, and the time is 4-5 h.

[0023] Furthermore, the second grinding is a second ball milling; preferably, the grinding media of the second ball mill is any one or more of zirconia balls and alumina balls;

[0024] Preferably, the diameters of the grinding media in the second ball mill are 10-12 mm, 8-10 mm, and 5-6 mm, respectively, and are mixed in a ratio of 1:1:3.

[0025] Preferably, the ball-to-material ratio in the second ball mill is 8-10:1;

[0026] Preferably, the second ball mill operates at a speed of 200-250 r / min for 1-1.5 h.

[0027] Further, step A3 includes: step A31, mixing the SiO2 fiber / particle mixture with a silane coupling agent and stirring to obtain a modified SiO2 fiber / particle mixture; step A32, mixing the modified SiO2 fiber / particle mixture with a resin matrix and additives to obtain an anti-corrosion and hydrophobic coating.

[0028] According to another aspect of this application, a method for applying an anti-corrosion and hydrophobic coating as described above is provided, the method comprising: applying the anti-corrosion and hydrophobic coating to the surface of a metal part, preferably, the coating thickness being 80-120 μm.

[0029] The present invention provides an anti-corrosion and hydrophobic coating in which micron-sized SiO2 microspheres are embedded in the bottom layer to provide micron-sized roughness, while nano-sized SiO2 microspheres contribute nano-sized roughness. SiO2 nanofibers provide a spatial stacking structure, thereby constructing a micro / nano three-dimensional spatial structure and forming many micropores between the microstructures. The multi-scale, multi-dimensional micro-spatial structure is conducive to capturing more air. The captured air forms a thin "air cushion" on the surface of the hierarchical porous structure, which can support water droplets and prevent them from penetrating into the interior of the coating, thus exhibiting superhydrophobic properties. At the same time, the uniformly distributed nano-sized SiO2 particles are tightly bound together by the coating effect and the chemical bonds formed by the coupling agent, making the coating structure dense and hindering water vapor from penetrating into the inner layer, thereby improving corrosion resistance. Attached Figure Description

[0030] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0031] Figure 1 A schematic diagram of the preparation process of the anti-corrosion and hydrophobic coating according to an embodiment of the present invention is shown;

[0032] Figure 2 A schematic diagram of the anti-corrosion layer structure according to an embodiment of the present invention is shown.

[0033] The above figures include the following reference numerals: 100, anti-corrosion and hydrophobic coating; 200, plating; 300, metal substrate. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] As analyzed in the background section of this application, there is a problem in the prior art where metal parts cannot meet the service life requirements of surface photovoltaic power stations under near-shore and harsh service conditions. In order to solve this problem, this application provides an anti-corrosion and hydrophobic coating, its preparation method and application method.

[0036] According to a typical embodiment of this application, an anti-corrosion and hydrophobic coating is provided, comprising, by weight, 35-60 parts of resin matrix, 35-65 parts of nano-sized SiO2 microspheres, 10-20 parts of micron-sized SiO2 microspheres, 4-8 parts of SiO2 nanofibers, and 0.5-3 parts of silane coupling agent.

[0037] In the anti-corrosion and hydrophobic coating of this application, micron-sized SiO2 microspheres embedded in the bottom layer provide micron-level roughness, while nano-sized SiO2 microspheres contribute nano-level roughness. SiO2 nanofibers provide a spatial stacking structure, thereby constructing a micro / nano three-dimensional spatial structure and forming numerous micropores between the microstructures. The multi-scale, multi-dimensional micro-spatial structure is conducive to capturing more air. The captured air forms a thin "air cushion" on the surface of the hierarchical porous structure, which can support water droplets and prevent them from penetrating into the interior of the coating, thus exhibiting superhydrophobic properties. At the same time, the uniformly distributed nano-sized SiO2 particles are tightly bound together by the coating effect and the chemical bonds formed by the coupling agent, making the coating structure dense and hindering water vapor from penetrating into the inner layer, thereby improving corrosion resistance.

[0038] By applying the above-mentioned anti-corrosion and hydrophobic coating to the surface of hydrophilic metal parts to form a hydrophobic coating that isolates the corrosive medium from the metal parts, the unique hydrophobicity and density of the coating of the present invention significantly improve the corrosion resistance of the metal parts and meet the requirements of corrosion resistance and service life of water surface photovoltaic metal parts.

[0039] In some embodiments of this application, the particle size D50 of the nanoscale SiO2 microspheres is 60nm-80nm, which is quite effective in promoting the synergistic effect of nanoscale SiO2 microspheres and micron-scale SiO2 microspheres to construct a hydrophobic porous hierarchical structure.

[0040] In some embodiments of this application, the particle size D50 of the micron-sized SiO2 microspheres is 0.3μm-0.4μm, which can better match the nano-sized SiO2 microspheres and SiO2 nanofibers, giving the waterproof coating better hydrophobicity and anti-corrosion properties.

[0041] There are no special requirements regarding the source of the aforementioned nano-sized SiO2 microspheres and micron-sized SiO2 microspheres. In some preferred embodiments of this application, the nano-sized SiO2 microspheres and micron-sized SiO2 microspheres are prepared by a hydrothermal method. The nano-sized SiO2 microspheres and micron-sized SiO2 microspheres prepared by the hydrothermal method have better sphericity, and the spatial stacking structure formed is more conducive to capturing air, thereby further improving the hydrophobicity and anti-corrosion performance of the coating.

[0042] In some embodiments of this application, the above-mentioned nanoscale SiO2 microspheres are prepared by the following method: (1) Tetraethyl orthosilicate (TEOS) is dissolved in a mixed solution of ethanol and deionized water, with a TEOS concentration of 0.45-0.55 mol / L, to obtain solution A; (2) Ammonia water is measured and mixed evenly with ethanol, with an ammonia water concentration of 0.55-0.60 mol / L, and slowly added dropwise to solution A, and stirred for 15 min to 1 h to obtain solution B; (3) Solution B is reacted at 100-110℃ for 4-5 h; (4) The residue is removed by washing with ethanol, and dried at 50-70℃ for 2-5 h to obtain nanoscale SiO2 microspheres. The nanoscale SiO2 microspheres prepared by this method not only have good sphericity, but also have a particle size distribution that helps to further improve the performance of anti-corrosion and hydrophobic coatings.

[0043] In some embodiments of this application, the above-mentioned micron-sized SiO2 microspheres are prepared by the following method: (1) Tetraethyl orthosilicate (TEOS) is dissolved in a mixed solution of ethanol and deionized water, with a TEOS concentration of 0.45-0.55 mol / L, to obtain solution C; (2) Ammonia water is measured and mixed evenly with ethanol, with an ammonia water concentration of 0.55-0.60 mol / L, and slowly added dropwise to solution C, and stirred for 15 min to 1 h to obtain solution D; (3) Solution D is reacted at 60-80℃ for 6-6.5 h; (4) The residue is removed by washing with ethanol, and dried at 50-70℃ for 2-5 h to obtain micron-sized SiO2 microspheres. The SiO2 microspheres prepared by this method have good sphericity and a particle size of 0.3-0.4 μm. When applied to the above-mentioned anti-corrosion and hydrophobic coating, their hydrophobic and anti-corrosion properties can be further improved.

[0044] In some embodiments of this application, the aspect ratio of SiO2 nanofibers is >20. When combined with the above-mentioned nanoscale SiO2 microspheres and micron-scale SiO2 microspheres, the hydrophobic and anti-corrosion properties of the coating can be further improved.

[0045] This application does not limit the source or preparation method of SiO2 nanofibers; for example, they can be prepared by electrospinning. In some embodiments of this application, the preparation method of SiO2 nanofibers is as follows: Step S1, mixing tetraethyl orthosilicate, polyvinylpyrrolidone, acid, and resin matrix to obtain a spinning precursor solution; Step S2, electrospinning the spinning precursor solution to obtain a fiber precursor film; Step S3, calcining the fiber precursor film to obtain SiO2 nanofibers. Preferably, the resin matrix in step S1 is ethanol and N,N-dimethylformamide in a volume ratio of 1:1.0-1.2; preferably, the acid is acetic acid. Preferably, in step S2, the electrospinning process parameters include: positive voltage 18-20kV, negative voltage 2-4kV, receiving distance 12-15cm, injection pump flow rate 0.6-0.8mL / h, temperature 20℃, and relative humidity 45%RH-55%RH; preferably, in step S3, the calcination temperature is 500-700℃; preferably, step S3 includes: heating to the calcination temperature at a rate of 0.5-1℃ / min and holding at that temperature for 2-4 hours.

[0046] In some embodiments of this application, the silane coupling agent includes any one or more of KH-560, KH-550 and KH-570. The above-mentioned silane coupling agent can modify SiO2 microspheres and SiO2 nanofibers to further enhance their hydrophobic properties. In particular, when KH-560 is used, the hydrophobicity of the coating formed by the above-mentioned anti-corrosion hydrophobic coating is better.

[0047] In some embodiments of this application, the resin matrix includes any one or more of polydimethylsiloxane, polyurethane, epoxy resin and acrylic resin; in particular, when polydimethylsiloxane is selected as the resin matrix, it not only has good dispersibility for nano-SiO2 microspheres, micron-sized SiO2 microspheres and SiO2 nanofibers, but also has good adhesion, so that the coating formed by the anti-corrosion and hydrophobic coating of this application has better density.

[0048] To further improve the performance of anti-corrosion and hydrophobic coatings to adapt to different application environments, anti-corrosion and hydrophobic coatings may also include additives, such as any one or more of film-forming aids, defoamers, and diluents.

[0049] In some embodiments of this application, the content of the film-forming aid is 3-6 wt% of the anti-corrosion and hydrophobic coating, which has a significant effect on improving the performance of the above-mentioned anti-corrosion and hydrophobic coating. Preferably, the film-forming aid includes any one or more of ethylene glycol and propylene glycol, which is beneficial to further improve the stability of the coating.

[0050] In some embodiments of this application, the content of the defoamer is 0.5-2 wt% of the anti-corrosion and hydrophobic coating, which has a significant effect on improving the performance of the anti-corrosion and hydrophobic coating; preferably, the defoamer includes PA-311.

[0051] In some embodiments of this application, the content of the diluent is 3.5-6 wt% of the anti-corrosion and hydrophobic coating, which has a significant regulating effect on the fluidity of the coating; preferably, the diluent includes any one or more of ethanol and water. In particular, when the diluent includes ethanol and deionized water, it can not only improve the fluidity of the coating and facilitate application, but also help to uniformly disperse the components in the coating.

[0052] In some preferred embodiments of the application, the anti-corrosion and hydrophobic coating comprises, by weight, 0.5-3 wt% KH-560, 3-6 wt% ethylene glycol, 0.5-2 wt% PA-311, 0.5-1 wt% anhydrous ethanol and 3-5 wt% deionized water, which not only has good hydrophobicity and anti-corrosion properties, but also has excellent overall performance.

[0053] According to another typical embodiment of this application, a method for preparing any of the above-mentioned anti-corrosion and hydrophobic coatings is provided. The preparation method includes the following steps: Step A1, mixing nano-sized SiO2 microspheres and micron-sized SiO2 microspheres, and grinding them for the first time to obtain micro / nano SiO2 microsphere composite powder; Step A2, mixing the micro / nano SiO2 microsphere composite powder with SiO2 nanofibers, and grinding them for the second time to obtain SiO2 fiber / particle mixed powder; Step A3, mixing the SiO2 fiber / particle mixed powder with a silane coupling agent and a resin matrix to obtain an anti-corrosion and hydrophobic coating.

[0054] The above preparation method involves first grinding to uniformly disperse nano-sized and micro-sized SiO2 microspheres, forming a composite of nano-sized and micro-sized SiO2 microspheres. This composite is then further mixed and ground with SiO2 nanofibers to form a spatially stacked structure, constructing a micro / nano three-dimensional structure. Furthermore, grinding these three components in two steps not only ensures uniform dispersion and a stable, uniform three-dimensional stack but also prevents excessive grinding of the SiO2 nanofibers from affecting their aspect ratio and spatial structure. Finally, modification with a silane coupling agent further enhances the hydrophobic and anti-corrosion properties of the anti-corrosion and hydrophobic coating.

[0055] The specific methods for the first and second grinding can refer to existing technologies, such as ball milling.

[0056] In some preferred embodiments of this application, to achieve a more uniform dispersion of nano-sized and micro-sized SiO2 microspheres and obtain a better-performing anti-corrosion and hydrophobic coating, the first grinding process is a first ball milling process. The grinding media of the first ball milling process are stainless steel balls, which have a superior dispersion effect on nano-sized and micro-sized SiO2 microspheres. The diameters of the grinding media in the first ball milling process are 14-16 mm, 10-12 mm, and 6-8 mm, respectively, and they are mixed in a ratio of 1 to 2:1 to 3:1. More preferably, the ratio of grinding media with diameters of 14-16 mm, 10-12 mm, and 6-8 mm is 2:2:1. Preferably, the ball-to-material ratio of the first ball milling process is 12-15:1; preferably, the rotation speed of the first ball milling process is 400-600 r / min, and the time is 4-5 h.

[0057] In some embodiments of this application, the second grinding is a second ball milling, and the milling media of the second ball mill is any one or more of zirconia balls and alumina balls. This achieves effective dispersion while better protecting the structure of the SiO2 nanofibers from damage. Preferably, the diameters of the milling media in the second ball mill are 10-12 mm, 8-10 mm, and 5-6 mm, respectively, and they are mixed in a ratio of 1:0.5 to 1.5:2 to 4. The resulting SiO2 fiber / particle mixed powder, when applied to coatings, helps to further improve their hydrophobic properties. More preferably, the ratio of milling media with diameters of 10-12 mm, 8-10 mm, and 5-6 mm is 1:1:3. Preferably, the ball-to-material ratio of the second ball mill is 8-10:1; preferably, the rotation speed of the second ball mill is 200-250 r / min, and the time is 1-1.5 h.

[0058] In some embodiments of this application, step A3 includes: step A31, mixing the SiO2 fiber / particle mixture with a silane coupling agent and stirring to obtain a modified SiO2 fiber / particle mixture; step A32, mixing the modified SiO2 fiber / particle mixture with a resin matrix and additives to obtain an anti-corrosion and hydrophobic coating. Modifying the SiO2 fiber / particle mixture with a silane coupling agent before mixing it with other components of the coating is beneficial for further improving the hydrophobicity of the anti-corrosion and hydrophobic coating.

[0059] In some typical embodiments of this application, the preparation process of the anti-corrosion and hydrophobic coating is as follows: Figure 1As shown, nano-SiO2 microspheres and micron-sized SiO2 microspheres are mixed, ball-milled in the first stage to separate the milling media, and dried to obtain a micro / nano-SiO2 microsphere composite powder; the micro / nano-SiO2 microsphere composite powder is mixed with SiO2 nanofibers, ball-milled in the second stage to separate the milling media, and dried to obtain a SiO2 fiber / particle mixed powder; the SiO2 fiber / particle mixed powder is modified with a silane coupling agent to obtain a modified SiO2 fiber / particle mixture; a diluent and a film-forming agent are mixed and stirred to obtain a mixed solution; the mixed solution is mixed with a resin matrix to obtain a mixed liquid; the modified SiO2 fiber / particle mixture is added to the mixed liquid, and an antifoaming agent is added and stirred to obtain an anti-corrosion and hydrophobic coating.

[0060] According to another typical embodiment of this application, a method for applying any of the above-mentioned anti-corrosion and hydrophobic coatings is provided, the method comprising: applying the anti-corrosion and hydrophobic coating to the surface of a metal part.

[0061] The aforementioned anti-corrosion and hydrophobic coating is applied to the metal surface to form a hydrophobic coating, which can change its hydrophilicity, isolate the contact between the corrosive medium and the metal parts, significantly improve the corrosion resistance of the metal parts, and meet the requirements of corrosion resistance and service life of water surface photovoltaic metal parts.

[0062] In some preferred embodiments of this application, the thickness of the above-mentioned anti-corrosion and hydrophobic coating is 80-120μm, which has a good anti-corrosion effect on metal parts and can meet the anti-corrosion requirements of photovoltaic metal parts near the sea surface.

[0063] After the above-mentioned anti-corrosion and hydrophobic coating is applied, the curing conditions can be determined according to the selected base resin type. In some embodiments of this application, after the above-mentioned anti-corrosion and hydrophobic coating is applied, it is cured at 100-120°C for 2-4 hours.

[0064] In some embodiments of this application, to further improve the lifespan of the metal substrate, the application method of the above-mentioned anti-corrosion and hydrophobic coating includes: employing, for example... Figure 2 The anti-corrosion layer structure shown has a coating 200 on the surface of a metal substrate 300. The coating 200 includes, but is not limited to, a zinc-aluminum-magnesium coating or a zinc coating. The anti-corrosion hydrophobic coating is applied to the surface of the coating 200 to form an anti-corrosion hydrophobic coating 100. The coating formed by the coating and the anti-corrosion hydrophobic coating provides dual anti-corrosion protection.

[0065] The beneficial effects that this application can achieve will be further illustrated below with reference to embodiments and comparative examples.

[0066] Example 1

[0067] 1) Preparation of micro / nano SiO2 microspheres by hydrothermal synthesis:

[0068] (1) TEOS is dissolved in a mixed solution of ethanol and deionized water (TEOS concentration: 0.45 mol / L), i.e., solution A.

[0069] (2) After measuring ammonia water and mixing it evenly (ammonia water concentration: 0.55mol / L), slowly add it dropwise to solution A and stir magnetically for 30 minutes to obtain solution B.

[0070] (3) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 110°C for 5 hours.

[0071] (4) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain nano-sized SiO2 microspheres (particle size D50 is 60nm).

[0072] (5) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 80°C for 6.5 h.

[0073] (6) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain micron-sized SiO2 microspheres (particle size D50 is 0.3μm).

[0074] 2) Preparation of SiO2 nanofibers by electrospinning:

[0075] (1) Dissolve 25 ml of tetraethyl orthosilicate (TEOS) in 15 ml of anhydrous ethanol and N,N-dimethylformamide mixed solution (volume ratio 1:1.0) and stir well to obtain a mixed solution;

[0076] (2) Add 1 ml of acetic acid and 16 wt% of polyvinylpyrrolidone (PVP-K45) to the mixture and mix well to obtain a spinning precursor solution.

[0077] (3) Electrospinning the precursor solution and adjusting the spinning process parameters to obtain a uniform and continuous fiber precursor film. Electrospinning process parameters: positive voltage 18kV, negative voltage 2kV, receiving distance 12cm, injection pump flow rate 0.6mL / h, temperature 20℃, relative humidity 45%RH.

[0078] (4) The fiber precursor membrane was placed in a programmed temperature-controlled furnace for high-temperature calcination to obtain SiO2 nanofibers. The specific process was as follows: the fiber precursor membrane was placed in a programmed temperature-controlled furnace, the temperature inside the furnace was adjusted, and the temperature was slowly heated from room temperature to 500℃ at a heating rate of 0.5℃ / min. After holding at 600℃ for 2 hours, the temperature was slowly cooled to room temperature with the furnace. The aspect ratio of the obtained SiO2 nanofibers was >20.

[0079] 3) Preparation of anti-corrosion and hydrophobic coating:

[0080] The composition ratio of the anti-corrosion and hydrophobic coating is as follows: 48 parts of polydimethylsiloxane (PMDS), 45 parts of nano-SiO2 microspheres, 15 parts of micron-sized SiO2 microspheres, 4 parts of SiO2 nanofibers, 2% of KH-560, 1% of anhydrous ethanol, 4% of film-forming aid (ethylene glycol), 1% of defoamer (PA-311), and 4% of deionized water.

[0081] Prepare an anti-corrosion and hydrophobic coating by following these steps:

[0082] (1) Nanoscale SiO2 microspheres and micron-scale SiO2 microspheres are mixed and ball-milled to separate the ball milling media. The mixture is then dried to obtain micro / nano SiO2 microsphere composite powder. The grinding balls are stainless steel grinding balls with diameters of 15 mm, 12 mm and 8 mm, respectively. They are mixed in a ratio of 1:2:2, with a ball-to-material ratio of 12:1. The ball milling speed is 400 r / min and the ball milling time is 4 h.

[0083] (2) The micro / nano SiO2 microsphere composite powder and SiO2 nanofibers are mixed and ball-milled to separate the ball milling media. The mixture is then dried to obtain SiO2 fiber / particle mixed powder. The grinding balls are zirconia grinding balls with diameters of 10 mm, 8 mm and 6 mm, respectively, and are mixed in a ratio of 1:1:3. The ball-to-material ratio is 8:1. The ball milling speed is 200 r / min and the ball milling time is 1 h.

[0084] (3) Mix the SiO2 fiber / particle mixture with KH-560 and stir at 25°C for 10 min to obtain the modified SiO2 fiber / particle mixture.

[0085] (4) Add deionized water, ethanol and film-forming aid to a magnetic stirrer in proportion, stir at low speed for 15 minutes, then add polydimethylsiloxane (PMDS), stir at medium speed for 30 minutes, mix the modified SiO2 fiber / particle mixture with the above solution, stir rapidly for 40 minutes, then add defoamer and stir thoroughly. After mixing evenly, obtain the anti-corrosion and hydrophobic coating.

[0086] The prepared coating was applied to a carbon steel metal part with a zinc-magnesium-aluminum coating according to the method of GB / T1727-1992. The coating was applied in two coats with a thickness of 100 μm and then dried and cured at 120℃ for 2 hours.

[0087] Example 2

[0088] 1) Preparation of micro / nano SiO2 microspheres by hydrothermal synthesis:

[0089] (1) TEOS was dissolved in a mixed solution of ethanol and deionized water (TEOS concentration: 0.55 mol / L) to obtain solution A.

[0090] (2) After measuring ammonia water and mixing it evenly (ammonia water concentration: 0.55mol / L), slowly add it dropwise to solution A and stir magnetically for 30 minutes to obtain solution B.

[0091] (3) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 100°C for 5 hours.

[0092] (4) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain nano-sized SiO2 microspheres (particle size D50 is 72nm).

[0093] (5) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 70°C for 6 hours.

[0094] (6) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain micron-sized SiO2 microspheres (particle size D50 is 0.36μm).

[0095] 2) Preparation of SiO2 nanofibers by electrospinning:

[0096] (1) Dissolve 25 ml of tetraethyl orthosilicate (TEOS) in 15 ml of a mixture of anhydrous ethanol and N,N-dimethylformamide (volume ratio 1:1.1) and stir until homogeneous to obtain a mixed solution;

[0097] (2) Add 1.5 ml of acetic acid and 18 wt% of polyvinylpyrrolidone (PVP-K45) to the mixture and mix well to obtain a spinning precursor solution.

[0098] (3) Electrospinning the precursor solution and adjusting the spinning process parameters to obtain a uniform and continuous fiber precursor film. Electrospinning process parameters: positive voltage 19kV, negative voltage 3kV, receiving distance 12cm, injection pump flow rate 0.8mL / h, temperature 20℃, relative humidity 45%RH-55%RH.

[0099] (4) The fiber precursor membrane was placed in a programmed temperature-controlled furnace for high-temperature calcination to obtain SiO2 nanofibers. The specific process was as follows: the fiber precursor membrane was placed in a programmed temperature-controlled furnace, the temperature inside the furnace was adjusted, and the temperature was slowly heated from room temperature to 500℃ at a heating rate of 1℃ / min. After holding at 600℃ for 2 hours, the temperature was slowly cooled to room temperature with the furnace. The aspect ratio of the obtained SiO2 nanofibers was >20.

[0100] 3) Preparation of anti-corrosion and hydrophobic coating:

[0101] The mass composition ratio of the anti-corrosion and hydrophobic coating in this embodiment is as follows: 45 parts of polydimethylsiloxane (PMDS), 40 parts of nano-sized SiO2 microspheres, 10 parts of micron-sized SiO2 microspheres, 4 parts of SiO2 nanofibers, 3% of KH-560, 1% of anhydrous ethanol, 5% of film-forming aid (ethylene glycol), 1.5% of defoamer (PA-311), and 4% of deionized water.

[0102] Prepare an anti-corrosion and hydrophobic coating by following these steps:

[0103] (1) Nanoscale SiO2 microspheres and micron-scale SiO2 microspheres are mixed and ball-milled to separate the ball milling media. The mixture is then dried to obtain micro / nano SiO2 microsphere composite powder. The grinding balls are stainless steel grinding balls with diameters of 15 mm, 12 mm and 8 mm, respectively, and are mixed in a ratio of 1:2:2. The ball-to-material ratio is 14:1. The ball milling speed is 500 r / min and the ball milling time is 4.5 h.

[0104] (2) The micro / nano SiO2 microsphere composite powder and SiO2 nanofibers were mixed and ball-milled to separate the ball milling media. The mixture was then dried to obtain SiO2 fiber / particle mixed powder. The grinding balls were zirconia grinding balls with diameters of 10 mm, 8 mm and 6 mm, respectively, and were mixed in a ratio of 1:1:3. The ball-to-material ratio was 9:1. The ball milling speed was 250 r / min and the ball milling time was 1.5 h.

[0105] (3) Mix the SiO2 fiber / particle mixture with KH-560 and stir at 25°C for 10 min to obtain the modified SiO2 fiber / particle mixture.

[0106] (4) Add deionized water, ethanol and film-forming aid to a magnetic stirrer in proportion, stir at low speed for 15 minutes, then add polydimethylsiloxane (PMDS), stir at medium speed for 30 minutes, mix the modified SiO2 fiber / particle mixture with the above solution, stir rapidly for 40 minutes, then add defoamer and stir thoroughly. After mixing evenly, obtain the anti-corrosion and hydrophobic coating.

[0107] The prepared coating was applied to the hot-dip galvanized aluminum-magnesium-carbon steel parts according to the method of GB / T1727-1992. The coating was applied in two coats with a thickness of 100 μm and then dried and cured at 120℃ for 2 hours.

[0108] Example 3

[0109] 1) Preparation of micro / nano SiO2 microspheres by hydrothermal synthesis

[0110] (1) TEOS was dissolved in a mixed solution of ethanol and deionized water (TEOS concentration: 0.55 mol / L) to obtain solution A.

[0111] (2) After measuring ammonia water and mixing it evenly (ammonia water concentration: 0.60 mol / L), slowly add it dropwise to solution A and stir magnetically for 30 min to obtain solution B.

[0112] (3) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 100°C for 4 hours.

[0113] (4) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain nano-sized SiO2 microspheres (particle size D50 is 80nm).

[0114] (5) After transferring solution B into the polytetrafluoroethylene liner of the reaction vessel, place it in an oven and react at 60°C for 6 hours.

[0115] (6) Remove the reaction vessel, clean it with ethanol (3 times) to remove the residue, and dry it at 60℃ for 3h to obtain micron-sized SiO2 microspheres (particle size D50 is 0.4μm).

[0116] 2) Preparation of SiO2 nanofibers by electrospinning:

[0117] (1) Dissolve 25 ml of tetraethyl orthosilicate (TEOS) in 15 ml of a mixture of anhydrous ethanol and N,N-dimethylformamide (volume ratio 1:1.2) and stir until homogeneous to obtain a mixed solution;

[0118] (2) Add 1.8 ml of acetic acid and 22 wt% of polyvinylpyrrolidone (PVP-K45) to the mixture and mix well to obtain a spinning precursor solution.

[0119] (3) Electrospinning the precursor solution and adjusting the spinning process parameters to obtain a uniform and continuous fiber precursor film. Electrospinning process parameters: positive voltage 20kV, negative voltage 4kV, receiving distance 15cm, injection pump flow rate 0.8mL / h, temperature 20℃, relative humidity 55%RH.

[0120] (4) The fiber precursor membrane was placed in a programmed temperature-controlled furnace for high-temperature calcination to obtain SiO2 nanofibers. The specific process was as follows: the fiber precursor membrane was placed in a programmed temperature-controlled furnace, the temperature inside the furnace was adjusted, and the temperature was slowly heated from room temperature to 500℃ at a heating rate of 1℃ / min. After holding at 600℃ for 2 hours, the temperature was slowly cooled to room temperature with the furnace. The aspect ratio of the obtained SiO2 nanofibers was >20.

[0121] 3) Preparation of anti-corrosion and hydrophobic coating:

[0122] The anti-corrosion and hydrophobic coating used in this scheme has the following composition ratio: 60 parts polydimethylsiloxane (PMDS), 35 parts nano-SiO2 microspheres, 20 parts micron-sized SiO2 microspheres, 8 parts SiO2 nanofibers, 3% KH-560, 1% anhydrous ethanol, 6% film-forming aid (ethylene glycol), 2% defoamer (PA-311), and 5% deionized water.

[0123] Prepare an anti-corrosion and hydrophobic coating by following these steps:

[0124] (1) Nanoscale SiO2 microspheres and micron-scale SiO2 microspheres are mixed and ball-milled to separate the ball milling media. The mixture is then dried to obtain micro / nano SiO2 microsphere composite powder. The grinding balls are stainless steel grinding balls with diameters of 15 mm, 12 mm and 8 mm, respectively. They are mixed in a ratio of 1:2:2, with a ball-to-material ratio of 15:1. The ball milling speed is 600 r / min and the ball milling time is 5 h.

[0125] (2) The micro / nano SiO2 microsphere composite powder and SiO2 nanofibers were mixed and ball-milled to separate the ball milling media. The mixture was then dried to obtain SiO2 fiber / particle mixed powder. The grinding balls were zirconia grinding balls with diameters of 10 mm, 8 mm and 6 mm, respectively, and were mixed in a ratio of 1:1:3. The ball-to-material ratio was 10:1. The ball milling speed was 250 r / min and the ball milling time was 1.5 h.

[0126] (3) Mix the SiO2 fiber / particle mixture with KH-560 and stir at 25°C for 10 min to obtain the modified SiO2 fiber / particle mixture.

[0127] (4) Add deionized water, ethanol and film-forming aid to a magnetic stirrer in proportion, stir at low speed for 15 minutes, then add polydimethylsiloxane (PMDS), stir at medium speed for 30 minutes, mix the modified SiO2 fiber / particle mixture with the above solution, stir rapidly for 40 minutes, then add defoamer and stir thoroughly. After mixing evenly, obtain the anti-corrosion and hydrophobic coating.

[0128] The prepared coating was applied to the hot-dip galvanized aluminum-magnesium-carbon steel parts according to the method of GB / T1727-1992. The coating was applied in two coats with a thickness of 100 μm and dried and cured at 120℃ for 2 hours.

[0129] Example 4

[0130] The difference from Example 1 is that: 1) When preparing micro / nano SiO2 microspheres by hydrothermal synthesis, in step (3), the micro / nano SiO2 microspheres are placed in an oven and reacted at 140°C for 3.5 h, and the particle size D50 of the prepared nano-sized SiO2 microspheres is 40 nm.

[0131] Example 5

[0132] The difference from Example 1 is that: 1) When preparing micro / nano SiO2 microspheres by hydrothermal synthesis, in step (3), the micro / nano SiO2 microspheres are placed in an oven and reacted at 90°C for 4.5 h, and the particle size D50 of the prepared nano-sized SiO2 microspheres is 100 nm.

[0133] Example 6

[0134] The difference from Example 1 is that: 1) When preparing micro / nano SiO2 microspheres by hydrothermal synthesis, in step (5), the micron-sized SiO2 microspheres are placed in an oven and reacted at 90°C for 4.5 h, and the particle size D50 of the micron-sized SiO2 microspheres is 0.1 μm.

[0135] Example 7

[0136] The difference from Example 1 is that: 1) When preparing micro / nano SiO2 microspheres by hydrothermal synthesis, in step (5), the reaction is carried out at 60°C for 9 hours, and the particle size D50 of the micron-sized SiO2 microspheres is 0.5 μm.

[0137] Example 8

[0138] The difference from Example 1 is that: 3) when preparing the anti-corrosion and hydrophobic coating, the amount of nano-SiO2 microspheres is 20 parts.

[0139] Example 9

[0140] The difference from Example 1 is that: 3) when preparing the anti-corrosion and hydrophobic coating, the amount of nano-SiO2 microspheres is 65 parts.

[0141] Example 10

[0142] The difference from Example 1 is that: 3) 100 parts of nano-SiO2 microspheres were used in the preparation of the anti-corrosion and hydrophobic coating.

[0143] Example 11

[0144] The difference from Example 1 is that: 3) when preparing the anti-corrosion and hydrophobic coating, the amount of SiO2 nanofibers is 15 parts.

[0145] Example 12

[0146] The difference from Example 1 is that the nano-sized SiO2 microspheres with a particle size D50 of 80 nm and the micro-sized SiO2 microspheres with a particle size D50 of 0.4 μm were prepared by a gel method. The preparation method is as follows: a certain amount of tetraethyl orthosilicate and anhydrous ethanol were added to a beaker. Under constant temperature and magnetic stirring, a mixed solution composed of distilled water, anhydrous ethanol and an appropriate amount of hydrochloric acid was slowly added dropwise. After forming a sol, it was placed in a fume hood for 1 hour. After becoming a gel, it was placed in a drying oven for 4 hours, ground, and then placed in a box-type resistance furnace and calcined at 700°C for 3 hours to obtain SiO2 powder.

[0147] Example 13

[0148] The difference from Example 1 is that: 3) when preparing the anti-corrosion and hydrophobic coating, the same amount of KH550 is used instead of KH-560.

[0149] Example 14

[0150] The difference from Example 1 is that: 3) when preparing the anti-corrosion and hydrophobic coating, polyurethane is used instead of polydimethylsiloxane in the same proportion.

[0151] Example 15

[0152] The difference from Example 1 is that: 3) the preparation of the anti-corrosion and hydrophobic coating is as follows:

[0153] The composition ratio of the anti-corrosion and hydrophobic coating is as follows: 48 parts of polydimethylsiloxane (PMDS), 45 parts of nano-SiO2 microspheres, 15 parts of micron-sized SiO2 microspheres, 4 parts of SiO2 nanofibers, 2% of KH-560, 1% of anhydrous ethanol, 4% of film-forming aid (ethylene glycol), 1% of defoamer (PA-311), and 4% of deionized water.

[0154] Prepare an anti-corrosion and hydrophobic coating by following these steps:

[0155] (1) Nanoscale SiO2 microspheres, micron-scale SiO2 microspheres, and SiO2 nanofibers were mixed and ball-milled to separate the milling media. The mixture was then dried to obtain a micro / nano SiO2 microsphere composite powder. The milling balls were stainless steel milling balls with diameters of 15 mm, 12 mm, and 8 mm, respectively, and were mixed in a ratio of 1:2:2 (ball-to-material ratio of 12:1). The milling speed was 400 r / min, and the milling time was 4 h. A SiO2 fiber / particle mixed powder was thus prepared.

[0156] (2) Mix the SiO2 fiber / particle mixture with KH-560 and stir at 25°C for 10 min to obtain the modified SiO2 fiber / particle mixture.

[0157] (3) Add deionized water, ethanol and film-forming aid to a magnetic stirrer in proportion, stir at low speed for 15 minutes, then add polydimethylsiloxane (PMDS), stir at medium speed for 30 minutes, mix the modified SiO2 fiber / particle mixture with the above solution, stir rapidly for 40 minutes, then add defoamer and stir thoroughly. After mixing evenly, obtain the anti-corrosion and hydrophobic coating.

[0158] The prepared coating was applied to the hot-dip galvanized aluminum-magnesium-carbon steel parts according to the method of GB / T1727-1992. The coating was applied in two coats with a thickness of 100 μm and dried and cured at 120℃ for 2 hours.

[0159] Comparative Example 1

[0160] The difference from Example 1 is that: 3) the anti-corrosion and hydrophobic coating does not contain nano-sized SiO2 microspheres or micron-sized SiO2 microspheres in the anti-corrosion and hydrophobic coating.

[0161] Comparative Example 2

[0162] The difference from Example 1 is that: 3) the anti-corrosion and hydrophobic coating does not contain nano-sized SiO2 microspheres in the anti-corrosion and hydrophobic coating during preparation.

[0163] Comparative Example 3

[0164] The difference from Example 1 is that: 3) the anti-corrosion and hydrophobic coating does not contain micron-sized SiO2 microspheres in the anti-corrosion and hydrophobic coating during preparation.

[0165] Comparative Example 4

[0166] The difference from Example 1 is that: 3) the anti-corrosion and hydrophobic coating does not contain SiO2 nanofibers in the anti-corrosion and hydrophobic coating during preparation.

[0167] The metal parts samples containing anti-corrosion and hydrophobic coatings prepared in the above embodiments and comparative examples were subjected to salt spray and cyclic aging tests. The test results are shown in Table 1 below.

[0168] The salt spray resistance test method is as follows:

[0169] Reference standards: GB / T 2423.18, ISO 9227;

[0170] Test requirements: Conduct CX-level salt spray tests according to ISO 9227 artificial atmosphere corrosion test / salt spray test standard.

[0171] CX: Spray temperature: 35±2℃; Settling volume: 1.5~2mL; Duration: 2h;

[0172] Drying temperature: 60±1℃; relative humidity: 20~30%; duration: 4h;

[0173] Humidification temperature: 50±1℃; Relative humidity: 95%; Duration: 2h;

[0174] Number of cycles: 180 (total 1440h = (2+4+2)x180).

[0175] The cyclic aging test method is as follows:

[0176] Test requirements: Cyclic aging test shall be conducted in accordance with ISO 12944 standard.

[0177] Cyclic aging test:

[0178] 1) 72 hours of exposure to ultraviolet light and water, in accordance with standard ISO 16474-3, under the following conditions: alternating 4 hours of ultraviolet irradiation (60±3℃) and 4 hours of condensation (50±3℃);

[0179] 2) A 72-hour neutral salt spray test shall be conducted in accordance with standard ISO 9227;

[0180] 3) 24-hour low temperature exposure test (-20±2)℃.

[0181] Number of cycles: 25 (total 4200h = (72 + 72 + 24) x 25).

[0182] Table 1

[0183]

[0184]

[0185] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: In the anti-corrosion and hydrophobic coating, micron-sized SiO2 microspheres embedded in the bottom layer provide micron-sized roughness, while nano-sized SiO2 microspheres contribute nano-sized roughness, and SiO2 nanofibers provide a spatial stacking structure, thereby constructing a micro / nano three-dimensional spatial structure and forming many micropores between the microstructures. The multi-scale and multi-dimensional micro-spatial structure is conducive to capturing more air. The captured air forms a thin "air cushion" on the surface of the hierarchical porous structure, which can support water droplets and prevent them from penetrating into the interior of the coating, thus exhibiting superhydrophobic properties. At the same time, the uniformly distributed nano-sized SiO2 particles are tightly bound together by the coating effect and the chemical bonds formed by the coupling agent, making the coating structure dense, hindering water vapor from penetrating into the inner layer, and improving corrosion resistance.

[0186] By applying the above-mentioned anti-corrosion and hydrophobic coating to the surface of hydrophilic metal parts to form a hydrophobic coating that isolates the corrosive medium from the metal parts, the unique hydrophobicity and density of the coating of the present invention significantly improve the corrosion resistance of the metal parts and meet the requirements of corrosion resistance and service life of water surface photovoltaic metal parts.

[0187] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. 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 corrosion-resistant and hydrophobic coating, characterized in that, include: By weight, the composition is as follows: 35-60 parts resin matrix, 35-65 parts nano-sized SiO2 microspheres, 10-20 parts micron-sized SiO2 microspheres, 4-8 parts SiO2 nanofibers, and 0.5-3 parts silane coupling agent. The particle size D50 of the nanoscale SiO2 microspheres is 60nm-80nm, the particle size D50 of the micron-scale SiO2 microspheres is 0.3μm-0.4μm, and the aspect ratio of the SiO2 nanofibers is >20. The nano-sized SiO2 microspheres and the micron-sized SiO2 microspheres are prepared by a hydrothermal method; the SiO2 nanofibers are prepared by electrospinning; the resin matrix is ​​selected from any one or more of polydimethylsiloxane and polyurethane; the silane coupling agent is selected from any one or more of KH-560 and KH-550. The preparation method of the anti-corrosion and hydrophobic coating includes the following steps: Step A1: Mix nano-sized SiO2 microspheres and micron-sized SiO2 microspheres, and grind them for the first time to obtain micro / nano SiO2 microsphere composite powder; Step A2: Mix the micro / nano SiO2 microsphere composite powder and SiO2 nanofibers, and grind them a second time to obtain SiO2 fiber / particle mixed powder; Step A3: Mix the SiO2 fiber / particle mixed powder with a silane coupling agent and a resin matrix to obtain an anti-corrosion and hydrophobic coating.

2. The anti-corrosion and hydrophobic coating according to claim 1, characterized in that, The anti-corrosion and hydrophobic coating also includes additives.

3. The anti-corrosion and hydrophobic coating according to claim 2, characterized in that, The additives include any one or more of film-forming aids, defoamers, and diluents.

4. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The content of the film-forming aid is 3-6 wt% of the anti-corrosion and hydrophobic coating.

5. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The film-forming aid includes any one or more of ethylene glycol and propylene glycol.

6. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The content of the defoamer is 0.5-2 wt% of the anti-corrosion and hydrophobic coating.

7. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The defoamer includes PA-311.

8. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The content of the diluent is 3.5-6 wt% of the anti-corrosion and hydrophobic coating.

9. The anti-corrosion and hydrophobic coating according to claim 3, characterized in that, The diluent includes any one or more of ethanol and water.

10. The anti-corrosion and hydrophobic coating according to claim 1, characterized in that, By weight, the anti-corrosion and hydrophobic coating comprises 0.5-3 wt% KH-560, 3-6 wt% ethylene glycol, 0.5-2 wt% PA-311, 0.5-1 wt% anhydrous ethanol and 3-5 wt% deionized water.

11. The anti-corrosion and hydrophobic coating according to claim 1, characterized in that, The first grinding process is a first ball milling process.

12. The anti-corrosion and hydrophobic coating according to claim 11, characterized in that, The grinding media of the first ball mill is stainless steel balls.

13. The anti-corrosion and hydrophobic coating according to claim 11, characterized in that, The diameters of the grinding media in the first ball mill are 14-16 mm, 10-12 mm and 6-8 mm, respectively, and they are mixed in a ratio of 2:2:

1.

14. The anti-corrosion and hydrophobic coating according to claim 11, characterized in that, The ball-to-material ratio of the first ball mill is 12-15:

1.

15. The anti-corrosion and hydrophobic coating according to claim 11, characterized in that, The first ball mill rotates at 400-600 r / min for 4-5 hours.

16. The anti-corrosion and hydrophobic coating according to claim 1, characterized in that, The second grinding process is a second ball milling process.

17. The anti-corrosion and hydrophobic coating according to claim 16, characterized in that, The milling media for the second ball mill are any one or more of zirconia balls and alumina balls.

18. The anti-corrosion and hydrophobic coating according to claim 16, characterized in that, The diameters of the grinding media in the second ball mill are 10-12 mm, 8-10 mm and 5-6 mm, respectively, and are mixed in a ratio of 1:1:

3.

19. The anti-corrosion and hydrophobic coating according to claim 16, characterized in that, The ball-to-material ratio of the second ball mill is 8-10:

1.

20. The anti-corrosion and hydrophobic coating according to claim 16, characterized in that, The second ball mill operates at a speed of 200-250 r / min for 1-1.5 h.

21. The anti-corrosion and hydrophobic coating according to any one of claims 11 to 20, characterized in that, Step A3 includes: Step A31: Mix the SiO2 fiber / particle mixture with a silane coupling agent and stir to obtain a modified SiO2 fiber / particle mixture; Step A32: The modified SiO2 fiber / particle mixture is mixed with the resin matrix and additives to obtain an anti-corrosion and hydrophobic coating.

22. The method of applying the anti-corrosion and hydrophobic coating according to any one of claims 1 to 21, characterized in that, include: The anti-corrosion and hydrophobic coating is applied to the surface of the metal part.

23. The application method according to claim 22, characterized in that, The coating thickness is 80-120μm.

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