Corrosion-resistant coating for surface of stainless steel metal wire and preparation method of corrosion-resistant coating

Abstract

The invention discloses a corrosion-resistant coating for the surface of a stainless steel metal wire and a preparation method, the corrosion-resistant coating sequentially comprises a base layer, a self-repairing layer and a hydrophobic surface layer from inside to outside, and the invention relates to the technical field of corrosion-resistant coatings. According to the corrosion-resistant coating for the surface of the stainless steel metal wire and the preparation method, a physical barrier is provided through a mode of compounding nano silicon dioxide and nano aluminum oxide, permeation of a corrosive medium is effectively blocked, interlayer binding force is enhanced through polydopamine, the situation that the coating is prone to falling off is avoided, nano-scale microcapsules are arranged in an epoxy resin matrix in a dispersed mode, and the corrosion resistance of the coating is improved. Molybdate and cerium dioxide are released when the coating is damaged, a protective film is formed, corrosion reaction is inhibited, the self-repairing function is achieved, the maintenance cost is reduced, meanwhile, the service life of the coating is prolonged, through the arrangement of the hydrophobic surface layer, the durable super-hydrophobic characteristic is achieved, the photocatalytic antibacterial function is achieved, microbial attachment is effectively inhibited, and the service life of the coating is prolonged. And a reliable guarantee is provided for lasting and effective use of the coating.

Description

Technical Field

[0001] The invention relates to the technical field of corrosion-resistant coatings, in particular to a corrosion-resistant coating for the surface of a stainless steel wire and a preparation method thereof. Background Art

[0002] Stainless steel itself has a certain degree of corrosion resistance, but stainless steel wire is still susceptible to corrosion in extreme environments (such as marine and chemical environments). Traditional corrosion-resistant surface protection methods mainly include painting, electroplating / electroless plating, thermal spraying, cold spraying, and oiling. Adding coating is currently a common surface protection method for marine climate corrosion resistance. However, due to the friction conditions of moving parts, the coating is prone to shedding, scratching, and wear, seriously affecting the corrosion resistance of the component.

[0003] For example, a flame-sprayed corrosion-resistant coating for stainless steel pipes and valves in a fluid system with application number 201910240421.4 is described. A NiAlMgSc anti-corrosion coating is flame-sprayed on the surface of the stainless steel pipe and valve. The Zn or Al components inside the coating undergo a chemical reaction to form a phosphate passivation film with strong corrosion resistance, which has a good physical isolation and sealing effect on the external corrosive atmosphere, blocks the entry of corrosive media, and achieves a stronger protective effect on the base metal.

[0004] Based on the search of the above information, it can be seen that after the traditional coating addition technology adds a corrosion-resistant coating on the surface of stainless steel metal, it is still easy to cause scratches on the coating. During use, the scratched part is more likely to be corroded. For this reason, a corrosion-resistant coating for the surface of stainless steel wire and a preparation method are specially proposed. The triple coating combination is used to improve the corrosion resistance and wear resistance, and when scratches occur, the scratches can be automatically repaired to further ensure the corrosion resistance effect. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a corrosion-resistant coating for the surface of stainless steel wire and a preparation method, which solves the problem that after the corrosion-resistant coating is added to the surface of the stainless steel metal, the coating is still easily scratched, and the scratched part is more likely to be corroded during use.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a corrosion-resistant coating for the surface of a stainless steel wire, comprising, from the inside to the outside, a base layer, a self-repairing layer, and a hydrophobic surface layer, wherein the thickness ratio of the base layer, the self-repairing layer, and the hydrophobic surface layer is 4:3:3; The base layer comprises nano-silicon dioxide and nano-aluminum oxide, wherein the weight ratio of the nano-silicon dioxide to the nano-aluminum oxide is 1:1-2; The self-repairing layer comprises epoxy resin and nano-scale microcapsules, wherein the weight ratio of the epoxy resin to the nano-scale microcapsules is 30-35:4-8; The hydrophobic surface layer comprises fluorine-containing silane and graphene quantum dots, and the weight ratio of the fluorine-containing silane to the graphene quantum dots is 1-3:3-5.

[0007] The present invention is further configured as follows: the nanoscale microcapsule comprises a capsule core and a capsule wall; The capsule core comprises molybdate and cerium dioxide, the molar ratio of the molybdate to cerium dioxide is 2:1, and the molybdate is one of K2MoO4, CaMoO4 and MgMoO4; The capsule wall comprises polymethacrylic acid and gelatin, and the mass ratio of the polymethacrylic acid to the gelatin is 1:1.

[0008] The present invention also discloses a method for preparing a corrosion-resistant coating on the surface of a stainless steel wire, which specifically comprises the following steps: S1. Base layer preparation: After cleaning the surface of the stainless steel wire, place it in a vacuum chamber, mix nano-silica and nano-alumina, and use them as targets. Use a high vacuum magnetron sputtering device to deposit a nanolayer on the stainless steel wire, dip-coat it with a polydopamine solution, and then anneal it at 150-200°C for 1 hour to complete the base layer preparation; S2. Preparation of self-repairing layer: Add nano-scale microcapsules to epoxy resin, stir evenly, apply to the periphery of the base layer, and cure at 60-80°C for 2-4 hours to complete the preparation of the self-repairing layer; S3. Preparation of hydrophobic surface layer: Activate the self-repairing layer, evenly disperse the fluorinated silane and graphene quantum dots in an ethanol-water mixed solvent, and then use ultrasonic spray pyrolysis spraying equipment to spray on the self-repairing layer at 150°C to complete the preparation of the hydrophobic surface layer.

[0009] The present invention is further configured as follows: the concentration of the polydopamine solution is 2-10 mg / ml.

[0010] The present invention is further configured as follows: the method of depositing a nanolayer on the stainless steel wire using a high vacuum magnetron sputtering device and dip-coating the polydopamine solution in S1 includes: The sputtering power of the high vacuum magnetron sputtering equipment is set to 100-200W, the working pressure is 0.1-1.0MPa, and the nanolayer is deposited at a deposition rate of 1-2nm / min. After the nanolayer thickness reaches 15-20nm, it is dipped in a polydopamine solution for 10-15min, and then the nanolayer is deposited, and the cycle is repeated 3-5 times.

[0011] The present invention is further configured as follows: the preparation method of the nanoscale microcapsules comprises: A1. Add molybdate and cerium dioxide to deionized water and stir at 500-800 rpm for 30 minutes to obtain a capsule core solution. A2. Dissolve gelatin in hot water to obtain a gelatin solution. Add polymethacrylic acid to ethanol and stir at 500-800 rpm for 45-50 minutes. Add the gelatin solution and stir at 200-300 rpm for 15-30 minutes to obtain a capsule wall solution. A3, mixing the capsule core solution and the capsule wall solution, stirring at a speed of 2000-3000 rpm for 10-20 minutes for emulsification, and generating nano-scale microcapsules with a diameter of 200-500 nm; A4. Separate the nano-scale microcapsules from the emulsion using a centrifuge at a speed of 8000-10000 rpm, wash with deionized water for at least three times, and vacuum dry the washed nano-scale microcapsules at 40-50° C. for 12 h to obtain nano-scale microcapsule powder.

[0012] The present invention is further configured as follows: the activation treatment of the self-repairing layer in S3 includes: The stainless steel wire with the self-repairing layer prepared was fixed on the stage and treated with a low-pressure oxygen plasma cleaner at a power of 100 W for 5 minutes, an oxygen flow rate of 20 sccm, and a vacuum degree of less than 5 Pa.

[0013] The present invention is further configured as follows: when spraying on the self-repairing layer in S3, the self-repairing layer is preheated to 120°C.

[0014] The present invention provides a corrosion-resistant coating for the surface of stainless steel wire and a preparation method thereof. It has the following beneficial effects: The present invention provides a physical barrier by means of a composite of nano-silicon dioxide and nano-aluminum oxide, effectively preventing the penetration of corrosive media, and utilizes polydopamine to enhance the interlayer bonding force to prevent the coating from easily falling off. Nano-scale microcapsules are dispersed in the epoxy resin matrix, and molybdate and cerium dioxide are released when the coating is damaged to form a protective film, inhibiting corrosion reactions and achieving self-repairing function. While reducing maintenance costs, the service life of the coating is extended. In addition, through the provision of a hydrophobic surface layer, the coating has long-lasting super-hydrophobic properties and photocatalytic antibacterial functions, effectively inhibiting the attachment of microorganisms, providing reliable protection for the long-term and effective use of the coating. DETAILED DESCRIPTION

[0015] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0016] The embodiments of the present invention provide the following technical solutions: Example 1 A method for preparing a corrosion-resistant coating on the surface of a stainless steel wire comprises the following steps: S1. Preparation of base layer: After cleaning the surface of stainless steel wire, place it in a vacuum chamber, mix nano-silicon dioxide and nano-alumina, and use them as target materials. The weight ratio of nano-silicon dioxide and nano-alumina is 1:1. Use high vacuum magnetron sputtering equipment to deposit a nano layer on the stainless steel wire, and dip-coat it with polydopamine solution. The concentration of polydopamine solution is 2 mg / ml. Specifically, set the sputtering power of high vacuum magnetron sputtering equipment to 100 W, the working pressure to 1.0 MPa, and the density of 2 nm / m In the process, nanolayer deposition was carried out at a deposition rate of 100 μg / min for 3 cycles. After the thickness of the nanolayer reached 15 nm, it was dipped in a polydopamine solution for 10 min, and then nanolayer deposition was carried out again. After that, it was annealed at 150°C for 1 h to complete the base layer preparation. Among them, the elastic modulus of the nanolayer was greater than 70 GPa. After dipping in the polydopamine solution, a PDA cross-linked network was formed, and the elongation at break was greater than 200%. Under the synergistic effect of the two, a bonding strength greater than 50 MPa was achieved, and the residual strength retention rate after the scratch test was higher than 90%.

[0017] The thickness of the base layer is 5 μm.

[0018] S2. Preparation of self-healing layer: Add nano-scale microcapsules to epoxy resin, wherein the weight ratio of epoxy resin to nano-scale microcapsules is 30:8. After stirring evenly, apply it to the periphery of the base layer and cure it at 60°C for 4 hours to complete the preparation of the self-healing layer, wherein the nano-scale microcapsules include a capsule core and a capsule wall, wherein the capsule core includes K2MoO4 and cerium dioxide, and the molar ratio of K2MoO4 and cerium dioxide is 2:1; the capsule wall includes polymethacrylic acid and gelatin, and the mass ratio of polymethacrylic acid and gelatin is 1:1.

[0019] The preparation method of nano-scale microcapsules includes: A1. Add K2MoO4 and cerium dioxide into deionized water and stir at 500 rpm for 30 min to obtain a capsule core solution; A2. Dissolve gelatin in hot water to obtain a gelatin solution. Add polymethacrylic acid to ethanol and stir at 500 rpm for 50 min. Add the gelatin solution and stir at 200 rpm for 30 min to obtain a capsule wall solution. A3, mixing the core solution and the wall solution, stirring at 2000 rpm for 20 min for emulsification to form nano-scale microcapsules; A4. Separate the nano-scale microcapsules from the emulsion using a centrifuge at a speed of 8000 rpm, wash them three times with deionized water, and vacuum dry the washed nano-scale microcapsules at 40° C. for 12 h to obtain nano-scale microcapsule powder.

[0020] The core solution is oxidized to form a passivation film at the scratch, with a repair rate of 0.1mm 2 / h.

[0021] The thickness of the self-healing layer is 8 μm.

[0022] S3. Preparation of hydrophobic surface layer: The stainless steel wire with the self-repairing layer prepared is fixed on the stage, and treated with a low-pressure oxygen plasma cleaning machine at 100W power for 5 minutes, an oxygen flow rate of 20sccm, and a vacuum degree of 4.5Pa to activate the self-repairing layer and introduce oxygen-containing polar groups, such as hydroxyl and carboxyl groups. When the water contact angle is less than 10°, it indicates that the oxygen-containing polar groups are successfully introduced. The self-repairing layer is then preheated to 120°C, and the fluorinated silane FAS and graphene quantum dots GQD are uniformly dispersed in an ethanol-water mixed solvent, wherein the fluorinated silane and graphene quantum dots are in a weight ratio of 1:5. Ultrasonic spray pyrolysis spraying equipment is used to spray on the self-repairing layer at 150°C to complete the preparation of the hydrophobic surface layer. Graphene quantum dots generate hydroxyl radicals under visible light, and the killing rate of Escherichia coli reaches 99.9%.

[0023] It should be noted that the ethanol / water mixed solvent evaporates rapidly at 150°C to form a micropapillary structure with a diameter of 5-10μm. A dehydration condensation reaction occurs between the fluorinated silane molecules to form a network structure: -Si-O-Si-. The graphene quantum dots are embedded in the FAS network through π-π interactions. At the same time, their oxygen-containing groups react with the silanol groups of FAS. The micropapillaries and graphene quantum dots with a diameter of less than 50nm cooperate to form a Cassie-Baxter superhydrophobic state. Using a contact angle tester, 5μL of deionized water was added, and it was found that the measured contact angle was greater than 155° and the rolling angle was less than 3°.

[0024] The thickness of the hydrophobic surface layer is 15-20 μm.

[0025] Example 2 The difference between this embodiment and embodiment 1 is that: S1. Preparation of the base layer: After cleaning the surface of the stainless steel wire, place it in a vacuum chamber, mix nano-silica and nano-alumina, and use them as a target material, wherein the weight ratio of nano-silica and nano-alumina is 1:2. Use a high vacuum magnetron sputtering device to deposit a nanolayer on the stainless steel wire, and dip-coat it with a polydopamine solution. The concentration of the polydopamine solution is 10 mg / ml. Specifically, set the sputtering power of the high vacuum magnetron sputtering device to 200 W, the working pressure to 0.1 MPa, and deposit the nanolayer at a deposition rate of 1 nm / min. Repeat 5 cycles. After the nanolayer thickness reaches 20 nm, dip-coat it in the polydopamine solution for 10 minutes, then deposit the nanolayer, and then anneal at 200°C for 1 hour to complete the base layer preparation.

[0026] The thickness of the base layer is 10 μm.

[0027] S2. Preparation of self-healing layer: Add nano-scale microcapsules to epoxy resin, wherein the weight ratio of epoxy resin to nano-scale microcapsules is 35:4. After stirring evenly, apply it to the periphery of the base layer and cure it at 80°C for 2 hours to complete the preparation of the self-healing layer, wherein the nano-scale microcapsules include a capsule core and a capsule wall, wherein the capsule core includes CaMoO4 and cerium dioxide, and the molar ratio of CaMoO4 and cerium dioxide is 2:1; the capsule wall includes polymethacrylic acid and gelatin, and the mass ratio of polymethacrylic acid and gelatin is 1:1.

[0028] The preparation method of nano-scale microcapsules includes: A1. Add CaMoO4 and cerium dioxide into deionized water and stir at 800 rpm for 30 min to obtain a capsule core solution; A2. Dissolve gelatin in hot water to obtain a gelatin solution. Add polymethacrylic acid to ethanol and stir at 800 rpm for 45 minutes. Add the gelatin solution and stir at 300 rpm for 15 minutes to obtain a capsule wall solution. A3, mixing the core solution and the wall solution, stirring at 3000 rpm for 10 min for emulsification to form nano-scale microcapsules; A4. Separate the nano-scale microcapsules from the emulsion using a centrifuge at a rotation speed of 10,000 rpm, wash them with deionized water five times, and vacuum dry the washed nano-scale microcapsules at 50° C. for 12 h to obtain nano-scale microcapsule powder.

[0029] The thickness of the self-healing layer is 15 μm.

[0030] The weight ratio of fluorinated silane and graphene quantum dots is 3:3.

[0031] Example 3 The difference between this embodiment and embodiment 1 is that: S1. Preparation of the base layer: After cleaning the surface of the stainless steel wire, place it in a vacuum chamber, mix nano-silica and nano-alumina, and use them as a target material, wherein the weight ratio of nano-silica and nano-alumina is 1:2. Use a high vacuum magnetron sputtering device to deposit a nanolayer on the stainless steel wire, and dip-coat it with a polydopamine solution. The concentration of the polydopamine solution is 7 mg / ml. Specifically, set the sputtering power of the high vacuum magnetron sputtering device to 150 W and the working pressure to 0.6 MPa. Deposit the nanolayer at a deposition rate of 2 nm / min, and repeat 4 times. After the thickness of the nanolayer reaches 18 nm, dip-coat it in the polydopamine solution for 13 minutes, and then deposit the nanolayer. Repeat several times, and then anneal at 180°C for 1 hour to complete the base layer preparation.

[0032] The thickness of the base layer is 8 μm.

[0033] S2. Preparation of self-healing layer: Add nano-scale microcapsules to epoxy resin, wherein the weight ratio of epoxy resin to nano-scale microcapsules is 33:5. After stirring evenly, apply it to the periphery of the base layer and cure it at 70°C for 3 hours to complete the preparation of the self-healing layer, wherein the nano-scale microcapsules include a capsule core and a capsule wall, wherein the capsule core includes MgMoO4 and cerium dioxide, and the molar ratio of MgMoO4 and cerium dioxide is 2:1; the capsule wall includes polymethacrylic acid and gelatin, and the mass ratio of polymethacrylic acid and gelatin is 1:1.

[0034] The preparation method of nano-scale microcapsules includes: A1. Add MgMoO4 and ceria to deionized water and stir at 700 rpm for 30 min to obtain a capsule core solution. A2. Dissolve gelatin in hot water to obtain a gelatin solution. Add polymethacrylic acid to ethanol and stir at 700 rpm for 48 minutes. Add the gelatin solution and stir at 250 rpm for 23 minutes to obtain a capsule wall solution. A3, mixing the core solution and the wall solution, stirring at 2500 rpm for 15 min for emulsification to form nano-scale microcapsules; A4. Separate the nano-scale microcapsules from the emulsion using a centrifuge at a rotation speed of 9000 rpm, wash them four times with deionized water, and vacuum dry the washed nano-scale microcapsules at 45° C. for 12 h to obtain nano-scale microcapsule powder.

[0035] The thickness of the self-healing layer is 13 μm.

[0036] The weight ratio of fluorinated silane to graphene quantum dots is 2:4.

[0037] Performance Testing To evaluate the mechanical properties of the base layer, the elastic modulus of the nanolayer, the elongation at break of the PDA cross-linked network, the bonding strength, and the strength retention rate were tested at least three times, and the average value was taken as the test result. The elastic modulus of the nanolayer was tested using the nanoindentation method, the elongation at break of the PDA cross-linked network was tested using a static tensile test, the bonding strength was tested using a scratch test method, and the strength retention rate was tested using a universal material testing machine for tensile testing. The maximum load value was recorded. The results are shown in Table 1: Table 1 Nanolayer elastic modulus Elongation at break of PDA cross-linked network Bonding strength Strength retention 75GPa 221% 52MPa 92% To verify the self-repair efficiency of the nano-scale microcapsules, the performance of the self-repair layer was tested using the repair rate as an indicator. The test method for the repair rate was as follows: after using a simulated corrosion environment, the regeneration process of the passivation film in the scratch area was observed using a laser confocal microscope, and the repair time was recorded to obtain the repair rate. The test results are shown in Table 2: In order to test the hydrophobic performance of the hydrophobic surface, the contact angle, sliding angle and micropapillary structure diameter of the hydrophobic surface were tested. The contact angle was tested using the sessile drop method, and the sliding angle was tested using the tilted platform method. The test results are shown in Table 3: Table 3 Sample number Contact angle / ° Roll angle / ° GQD concentration / mg / ml Micropapillary structure diameter / μm 1 156 2.1 0.11 5 2 152 4.1 0.19 8 3 155 2.9 0.15 6 4 150 4.8 0.23 9 5 154 3.5 0.17 7 It can be seen from Table 3 that the contact angle and sliding angle are affected by the micropapillary diameter and GQD concentration. The increase of micropapillary diameter and the increase of GQD concentration are helpful to enhance the superhydrophobic property.

[0038] Comparative experiment After epoxy resin coating, nano-ceramic coating and fluorocarbon coating were added to the surfaces of several stainless steel wires, the performance was compared with the corrosion-resistant coating provided by the present invention. The comparison results are shown in Table 4: As can be seen from Table 4, the corrosion-resistant coating proposed in the present invention performs well in the salt spray test, with no corrosion for 1000 hours, which is better than ordinary epoxy resin coating, nano-ceramic coating and fluorocarbon coating. In addition, the corrosion-resistant coating proposed in the present invention has a self-repairing function with a repair rate of 0.12 mm. 2 / h, other coatings do not have this function. The corrosion-resistant coating proposed in the present invention has a contact angle of 158° and a rolling angle of 2.5°, forming a super-hydrophobic surface, which is superior to other coatings. The elastic modulus and bonding strength of the corrosion-resistant coating proposed in the present invention are higher than those of other coatings, showing excellent mechanical properties.

[0039] In summary, the corrosion-resistant coating proposed in the present invention is significantly superior to the common epoxy resin coatings, nano-ceramic coatings and fluorocarbon coatings on the market in terms of corrosion resistance, self-healing, hydrophobicity and mechanical properties, and has broad application prospects and important research value.

[0040] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A corrosion-resistant coating for the surface of a stainless steel wire, characterized by: From the inside to the outside, it includes a base layer, a self-repairing layer and a hydrophobic surface layer, wherein the thickness ratio of the base layer, the self-repairing layer and the hydrophobic surface layer is 4:3:3; The base layer comprises nano-silicon dioxide and nano-aluminum oxide, wherein the weight ratio of the nano-silicon dioxide to the nano-aluminum oxide is 1:1-2; The self-repairing layer comprises epoxy resin and nano-scale microcapsules, wherein the weight ratio of the epoxy resin to the nano-scale microcapsules is 30-35:4-8; The hydrophobic surface layer comprises fluorine-containing silane and graphene quantum dots, and the weight ratio of the fluorine-containing silane to the graphene quantum dots is 1-3:3-5.

2. The corrosion-resistant coating for the surface of a stainless steel wire according to claim 1, characterized in that: Nano-scale microcapsules include a capsule core and a capsule wall; The capsule core comprises molybdate and cerium dioxide, the molar ratio of the molybdate to cerium dioxide is 2:1, and the molybdate is one of K2MoO4, CaMoO4 and MgMoO4; The capsule wall comprises polymethacrylic acid and gelatin, and the mass ratio of the polymethacrylic acid to the gelatin is 1:

1.

3. A method for preparing a corrosion-resistant coating for a stainless steel wire surface according to claim 1 or 2, characterized in that: The specific steps include: S1. Base layer preparation: After cleaning the surface of the stainless steel wire, place it in a vacuum chamber, mix nano-silica and nano-alumina, and use them as targets. Use a high vacuum magnetron sputtering device to deposit a nanolayer on the stainless steel wire, dip-coat it with a polydopamine solution, and then anneal it at 150-200°C for 1 hour to complete the base layer preparation; S2. Preparation of self-repairing layer: Add nano-scale microcapsules to epoxy resin, stir evenly, apply to the periphery of the base layer, and cure at 60-80°C for 2-4 hours to complete the preparation of the self-repairing layer; S3. Preparation of hydrophobic surface layer: Activate the self-repairing layer, evenly disperse the fluorinated silane and graphene quantum dots in an ethanol-water mixed solvent, and then use ultrasonic spray pyrolysis spraying equipment to spray on the self-repairing layer at 150°C to complete the preparation of the hydrophobic surface layer.

4. The method for preparing a corrosion-resistant coating for a stainless steel wire surface according to claim 3, characterized in that: The concentration of the polydopamine solution is 2-10 mg / ml.

5. The method for preparing a corrosion-resistant coating on the surface of a stainless steel wire according to claim 3, characterized in that: The method of depositing a nanolayer on the stainless steel wire using a high vacuum magnetron sputtering device and dip-coating the polydopamine solution in S1 includes: The sputtering power of the high vacuum magnetron sputtering equipment is set to 100-200W, the working pressure is 0.1-1.0MPa, and the nanolayer is deposited at a deposition rate of 1-2nm / min. After the nanolayer thickness reaches 15-20nm, it is dipped in a polydopamine solution for 10-15min, and then the nanolayer is deposited, and the cycle is repeated 3-5 times.

6. The method for preparing a corrosion-resistant coating on the surface of a stainless steel wire according to claim 3, characterized in that: The preparation method of the nanoscale microcapsules comprises: A1. Add molybdate and cerium dioxide to deionized water and stir at 500-800 rpm for 30 minutes to obtain a capsule core solution; A2. Dissolve gelatin in hot water to obtain a gelatin solution. Add polymethacrylic acid to ethanol and stir at 500-800 rpm for 45-50 minutes. Add the gelatin solution and stir at 200-300 rpm for 15-30 minutes to obtain a capsule wall solution. A3, mixing the core solution and the wall solution, stirring at a speed of 2000-3000 rpm for 10-20 minutes for emulsification, and generating nano-scale microcapsules with a diameter of 200-500 nm; A4. Separate the nano-scale microcapsules from the emulsion using a centrifuge at a speed of 8000-10000 rpm, wash with deionized water for at least three times, and vacuum dry the washed nano-scale microcapsules at 40-50° C. for 12 h to obtain nano-scale microcapsule powder.

7. The method for preparing a corrosion-resistant coating on the surface of a stainless steel wire according to claim 3, characterized in that: The method of activating the self-repairing layer in S3 includes: The stainless steel wire with the self-repairing layer prepared was fixed on the stage and treated with a low-pressure oxygen plasma cleaner at a power of 100 W for 5 minutes, an oxygen flow rate of 20 sccm, and a vacuum degree of less than 5 Pa.

8. The method for preparing a corrosion-resistant coating on the surface of a stainless steel wire according to claim 3, characterized in that: When spraying on the self-repairing layer in S3, the self-repairing layer is preheated to 120°C.

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