Antifouling antibacterial micro-arc oxidation product and preparation method thereof

Abstract

The invention relates to an antifouling and antibacterial micro-arc oxidation product and a preparation method thereof. The preparation method comprises the following steps: adding copper-containing powder into a workpiece to be subjected to micro-arc oxidation; the workpiece to be subjected to micro-arc oxidation is subjected to oxidation treatment through a copper-free micro-arc oxidation electrolyte, the copper-free micro-arc oxidation electrolyte comprises main salt, an additive, a pH regulator and water, the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH regulator is 0-10 g / L. No copper-containing component needs to be added into the micro-arc oxidation electrolyte, so that the stability of the electrolyte is improved, and the maintenance cost is reduced. In addition, the copper-containing micro-arc oxidation antifouling and antibacterial coating can be prepared on non-valve metal by adopting the preparation method disclosed by the invention. Meanwhile, the method is particularly suitable for preparing the antifouling and antibacterial coating on the surface of the copper-containing particle reinforced magnesium-based composite material.

Description

Technical Field

[0001] The invention belongs to the technical field of coatings, and in particular relates to an antifouling and antibacterial micro-arc oxidation product and a preparation method thereof. Background Art

[0002] Magnesium alloy is the lightest metal structural material in practical application at present, with the advantages of low density, high strength, damping, good machinability and casting performance. With the increasing environmental pollution and resource shortage, countries have continuously increased their requirements for lightweight and environmental protection. Magnesium alloys are increasingly valued by countries in the fields of aerospace, transportation, information industry, medical equipment, etc. However, magnesium alloys have always had problems such as low absolute strength, poor plastic deformation ability at room temperature and poor corrosion resistance. To date, coating is still a simple, low-cost and effective means to improve the surface properties of magnesium alloys. Among all the coating preparation methods suitable for magnesium alloys, micro-arc oxidation is considered to be a simple, environmentally friendly and universal surface modification method. In addition, this coating is also often used as a base layer for composite coatings due to its good bonding with the magnesium matrix and its porous characteristics.

[0003] As the application scenarios of magnesium alloys continue to expand, the working conditions they face are complex and changeable. For example, in a humid environment, the adverse accumulation of microorganisms, algae, animals and plants on the surface of magnesium alloy parts will seriously damage the service life of the parts. In an industrial environment, contact with microorganisms is inevitable, and their metabolic activities may lead to accelerated corrosion. This puts higher demands on the performance of micro-arc oxidation coatings. In daily life, magnesium alloy devices that are in direct contact with the human body are not good for human health if they do not have good antibacterial properties. Therefore, micro-arc oxidation coatings with anti-fouling and antibacterial properties can well prevent the above-mentioned adverse phenomena. At the same time, it is also conducive to expanding the application of magnesium alloys.

[0004] Copper is widely used in antifouling coatings because of its excellent antifouling effect. Its antifouling effect is to kill biological cells by releasing copper ions. It is reported that copper-containing micro-arc oxidation coatings show good antifouling and antibacterial properties. However, the technical solution for preparing copper-containing micro-arc oxidation coatings that has been reported is to add copper particles or copper salts to the electrolyte. Copper particles are easily precipitated in the electrolyte, and continuous stirring is required during the micro-arc oxidation process to keep the copper particles suspended. The addition of copper salts is also easily affected by changes in the pH of the electrolyte to form precipitation. Therefore, this method of adding copper-containing components to the electrolyte is not conducive to the stability of the electrolyte. This is not conducive to micro-arc oxidation production, significantly increases the maintenance cost of the electrolyte, and is not conducive to obtaining copper-containing micro-arc oxidation coatings with stable antifouling properties, and reduces the pass rate of copper-containing micro-arc oxidation coatings. In addition, since copper particles need to be added to the electrolyte, it is inevitable to change the electrolyte composition and adjust the electrical parameters, and even an additional micro-arc oxidation production line needs to be set up. Most importantly, the method of adding copper-containing components to the electrolyte can only prepare copper-containing micro-arc oxidation antifouling and antibacterial coatings on a limited number of valve metal surfaces, which limits the application scope of copper-containing micro-arc oxidation coatings. Summary of the invention

[0005] In order to overcome the problems existing in the prior art, the present invention provides an antifouling and antibacterial micro-arc oxidation product and a preparation method thereof.

[0006] A method for preparing an antifouling and antibacterial micro-arc oxidation product comprises the following steps: S1. adding copper-containing powder to a workpiece to be micro-arc oxidized;

[0007] S2. The workpiece to be micro-arc oxidized is oxidized by using a copper-free micro-arc oxidation electrolyte, wherein the copper-free micro-arc oxidation electrolyte comprises a main salt, a pH adjuster and water; or a main salt, a pH adjuster, water and an additive, wherein the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH adjuster is 0-10 g / L.

[0008] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein S1 specifically comprises: adding the copper-containing powder to a magnesium alloy or an aluminum alloy by a powder metallurgy method or a casting method to obtain a composite material in which the copper powder is uniformly distributed in the form of particles, and preparing the composite material into a workpiece to be micro-arc oxidized.

[0009] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein S1 specifically includes: after uniformly mixing copper powder with aluminum alloy or magnesium alloy powder, a layer of metal coating containing copper powder distributed in the form of particles is prefabricated on the surface of the workpiece by spraying, and the metal coating is used as the workpiece to be micro-arc oxidized.

[0010] According to the above aspects and any possible implementation, an implementation is further provided, wherein the copper-containing powder is any one or more combinations of pure copper powder, copper alloy powder, and copper oxide powder, and the average particle size of the copper-containing powder is less than 50 μm.

[0011] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the mass fraction of the copper-containing powder added to the magnesium alloy or the aluminum alloy is less than or equal to 20 wt %.

[0012] According to the above aspects and any possible implementation, an implementation is further provided, wherein the main salt is any one or more combinations of sodium silicate, trisodium phosphate, sodium hexametaphosphate, and sodium dihydrogen phosphate.

[0013] According to the above aspects and any possible implementation, an implementation is further provided, wherein the additive is a combination of any one or more of potassium carbonate, sodium bicarbonate, sodium carbonate, ammonium carbonate, calcium carbonate, sodium oxalate, and potassium oxalate.

[0014] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein the main salt is a combination of sodium silicate and trisodium phosphate, and the mass concentration of the sodium silicate is 10 g / L, and the mass concentration of the trisodium phosphate is 6 g / L; the additive is sodium bicarbonate, and its mass concentration is 5 g / L; the pH adjuster is sodium hydroxide, and its mass concentration is 1 g / L.

[0015] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein the main salt is a combination of sodium silicate, trisodium phosphate and sodium dihydrogen phosphate, and the mass concentration of the sodium silicate is 10 g / L, the mass concentration of the trisodium phosphate is 5 g / L, and the mass concentration of the sodium dihydrogen phosphate is 3 g / L; the additives are sodium bicarbonate and sodium oxalate, the mass concentration of the sodium bicarbonate is 3 g / L, and the mass concentration of the sodium oxalate is 4 g / L; the pH adjuster is sodium hydroxide, and the mass concentration is 1 g / L.

[0016] The present invention also provides an antifouling and antibacterial micro-arc oxidation product, which is obtained by adopting the preparation method.

[0017] According to the above aspects and any possible implementation, an implementation is further provided, wherein the magnesium alloy is AZ91, and the mass ratio of the magnesium alloy to the pure copper powder is 9:1.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The invention discloses a method for preparing an antifouling and antibacterial micro-arc oxidation product, wherein copper-containing powder is added to a workpiece to be micro-arc oxidized; the workpiece to be micro-arc oxidized is oxidized by using a copper-free micro-arc oxidation electrolyte, wherein the copper-free micro-arc oxidation electrolyte comprises a main salt, a pH regulator and water; or a main salt, a pH regulator, water and an additive, wherein the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH regulator is 0-10 g / L. The method has the following beneficial effects: (1) the copper-containing powder is added to the magnesium alloy by powder metallurgy or casting, and the copper-containing powder is uniformly distributed in the composite material in the form of particles. On the one hand, the purpose of particle reinforcement is achieved, the mechanical properties of the magnesium alloy are improved, the performance of the magnesium alloy meets the performance requirements of more structural materials, and the engineering application range of the magnesium alloy is expanded. On the other hand, a copper source is provided for micro-arc oxidation, and a copper-free micro-arc oxidation electrolyte is realized.

[0020] (2) A copper-containing metal-based coating is prefabricated on the surface of the workpiece by spraying, and the copper-containing powder is distributed in the sprayed coating in the form of particles. On the one hand, this method can expand the base alloy to non-valve metals, expanding the application range of the micro-arc oxidation coating. On the other hand, it provides a copper source for micro-arc oxidation and realizes a copper-free micro-arc oxidation electrolyte.

[0021] (3) By adding copper-containing powder to the workpiece, the workpiece can be subjected to micro-arc oxidation treatment in a micro-arc oxidation electrolyte to obtain a copper-containing micro-arc oxidation coating, thereby reducing the electrolyte maintenance cost and reducing the production line and labor costs.

[0022] (4) The copper-free micro-arc oxidation electrolyte of the present invention has the advantages of optimizing the micro-arc oxidation discharge behavior of the workpiece, so that the workpiece surface has better film formation and growth. Before the workpiece to be micro-arc oxidized enters the electrolyte for spark discharge, the copper-containing particles mainly undergo oxidation and dissolution reactions. After the workpiece is placed, the carbonate or oxalate additive in the electrolyte combines with the copper ions on the surface of the workpiece to form copper carbonate or copper oxalate precipitation, which promotes the formation of a complete barrier film layer on the surface of the workpiece, thereby achieving the conditions for spark discharge. Subsequently, the copper carbonate or copper oxalate precipitation decomposes into copper oxide and carbon dioxide under the heat of discharge. At the same time, the carbon dioxide gas formed is beneficial to the continuity and uniformity of the gas film layer at the interface of the electrolyte solution, which promotes more uniform spark discharge and thus makes the coating grow more uniformly. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The surface morphology and Cu element distribution diagram of the micro-arc oxidation coating prepared by the present invention, wherein a is the SEM image of the coating, and b is the Cu element distribution diagram;

[0024] Figure 2 The XPS analysis results of the micro-arc oxidation coating made with traditional alkaline silicate;

[0025] Figure 3 The Cu element distribution diagram of the surface morphology of the micro-arc oxidation coating prepared by the copper-free electrolyte of the present invention, wherein a is the SEM image of the coating, and b is the Cu element distribution diagram;

[0026] Figure 4 The figure is a flow chart of the method of the present invention. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present invention, the content of the present invention includes but is not limited to the specific implementation methods described below, and similar technologies and methods should be considered to be within the scope of protection of the present invention. In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments.

[0028] It should be clear that the embodiments described in the present invention are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0030] like Figure 4 As shown, the present invention provides a method for preparing an antifouling and antibacterial micro-arc oxidation product, comprising the following steps: S1. adding copper-containing powder to a workpiece to be micro-arc oxidized;

[0031] S2. The workpiece to be micro-arc oxidized is oxidized by using a copper-free micro-arc oxidation electrolyte, wherein the copper-free micro-arc oxidation electrolyte comprises a main salt, a pH adjuster and water; or a main salt, a pH adjuster, water and an additive, wherein the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH adjuster is 0-10 g / L.

[0032] The copper-containing powder is any one of pure copper powder and copper alloy powder or a combination thereof, the average particle size of the copper-containing powder is less than 50 μm, and the mass fraction of the added copper-containing powder does not exceed 20 wt %.

[0033] Furthermore, the method of adding copper-containing powder is: first, copper powder is added to magnesium alloy or aluminum alloy by any one of powder metallurgy or casting to obtain a copper-containing composite material, and the copper-containing powder is evenly distributed in the composite material in the form of particles, and then a workpiece is prepared.

[0034] Furthermore, the method of adding the copper-containing powder to the workpiece is: after uniformly mixing the copper powder with the aluminum alloy or magnesium alloy powder, a copper-containing metal coating is preformed on the surface of the workpiece by spraying, the copper-containing powder is distributed in the sprayed coating in the form of particles, and then the workpiece with the coating is subjected to micro-arc oxidation treatment.

[0035] Further, the copper-free micro-arc oxidation electrolyte is composed of 5-20 g / L of main salt, 1-8 g / L of additives, 0-10 g / L of pH regulator and water, or the copper-free micro-arc oxidation electrolyte is composed of 5-20 g / L of main salt, 0-10 g / L of pH regulator and water. The two components of the electrolyte are specially optimized for the presence of copper-containing particles on the workpiece, and can promote rapid film formation on the workpiece surface and obtain a uniform and dense coating.

[0036] Furthermore, the main salt is any one or more combinations of sodium silicate, trisodium phosphate, sodium hexametaphosphate, and sodium dihydrogen phosphate; the additive is any one or more combinations of potassium carbonate, sodium bicarbonate, sodium carbonate, ammonium carbonate, calcium carbonate, sodium oxalate, and potassium oxalate; the pH adjuster is sodium hydroxide and sulfuric acid. Since the present invention adds copper powder to the workpiece in advance by spraying, powder metallurgy or casting, the electrolyte used can only contain the main salt, pH adjuster and water, and micro-arc oxidation can be completed without additives; additives can also be added to the main salt, pH adjuster and water, and micro-arc oxidation treatment can be achieved.

[0037] The invention is applicable to aluminum-based or magnesium-based composite materials reinforced with copper particles, or prefabricating an aluminum-based or magnesium-based coating containing copper particles on the surface of a workpiece by spraying, and then preparing a micro-arc oxidation coating on the workpiece in a copper-free electrolyte.

[0038] As an embodiment disclosed in the present invention, the present invention further discloses an antifouling and antibacterial micro-arc oxidation product, and the product is obtained by adopting the preparation method described in the present invention.

[0039] The method of the present invention is specifically described below using examples.

[0040] [Example 1]

[0041] Pure copper powder is added to magnesium alloy AZ91 by powder metallurgy, and then the magnesium alloy obtained after addition is subjected to micro-arc oxidation treatment in a copper-free micro-arc oxidation electrolyte to obtain a copper-containing micro-arc oxidation coating. The specific implementation process is as follows:

[0042] 1. AZ91 powder and pure copper powder with a mass ratio of 9:1 were fully and evenly mixed and pressed into shape, and then spark plasma sintered to obtain AZ91 magnesium alloy doped with Cu with a mass fraction of 10%, which was recorded as AZ91 / 10Cu.

[0043] 2. Cut AZ91 / 10Cu into sheet-like workpieces and sand them with sandpaper to 2000#, then clean them with alcohol and blow dry them.

[0044] 3. A small test piece of AZ91 / 10Cu sheet workpiece was treated in a copper-free micro-arc oxidation electrolyte for 20 minutes in a constant current mode with a current density of 8A / dm 2 The composition of the electrolyte is 15g / L sodium silicate and 1g / L sodium hydroxide. This electrolyte does not contain additives.

[0045] 4. After the micro-arc oxidation treatment is completed, take out the sample, wash it with running water and blow it dry.

[0046] The surface morphology and Cu element distribution of the sample in Example 1 were observed by scanning electron microscopy. Figure 1 As shown, Figure 1 The gray area in b is the Cu element enriched area, which represents the distribution position of copper oxidation products in the coating, corresponding to Figure 1 The coating phase composition was analyzed by XPS. Figure 2 The copper powder added to the alloy is well incorporated into the micro-arc oxidation coating after micro-arc oxidation treatment, and the oxidation product of the copper powder is mainly Cu2O. Figure 1 The protrusions in the coating shown in a are Cu2O, while other areas are still mainly MgO and Mg2SiO4. Example 1 shows that the method of the present invention can be used to prepare a copper-containing micro-arc oxidation coating in a micro-arc oxidation electrolyte without additives, without adding any copper-containing components to the electrolyte, which is beneficial to the stability of the electrolyte.

[0047] [Example 2]

[0048] Pure copper powder is added to AZ91 by powder metallurgy, and then the obtained magnesium alloy is subjected to micro-arc oxidation treatment in the copper-free micro-arc oxidation electrolyte of the present invention to obtain a copper-containing micro-arc oxidation coating. The specific implementation process is as follows:

[0049] 1. AZ91 powder and pure copper powder with a mass ratio of 9:1 were fully and evenly mixed and pressed into shape, and then spark plasma sintered to obtain an AZ91 magnesium alloy composite material with a Cu doping mass fraction of 10%, which was recorded as AZ91 / 10Cu.

[0050] 2. Cut AZ91 / 10Cu into sheet-like workpieces and sand them with sandpaper to 2000#, then clean them with alcohol and blow dry them.

[0051] 3. A small test piece of AZ91 / 10Cu sheet workpiece was treated in a micro-arc oxidation electrolyte for 20 minutes using a constant current mode. The electrolyte used was a copper-free electrolyte prepared by the present invention: 10 g / L sodium silicate, 6 g / L trisodium phosphate, 5 g / L sodium bicarbonate and 1 g / L sodium hydroxide.

[0052] 4. After the micro-arc oxidation treatment is completed in a copper-free micro-arc oxidation electrolyte, the sample is obtained, washed with running water and then blown dry.

[0053] When the small test piece is subjected to micro-arc oxidation in the micro-arc oxidation electrolyte of the present invention, the micro-arc oxidation voltage climbing rate is faster than that in Example 1. Therefore, the film-forming ability in the copper-free micro-arc oxidation electrolyte is better, and the desired coating can be obtained in a shorter time. The morphology of the sample obtained in Example 2 is observed by scanning electron microscopy as shown in FIG. Figure 3 As shown, Figure 3 a in the figure is the surface morphology of the coating. Figure 3 b in the figure is the Cu element distribution diagram. Figure 3 It can be seen from b that compared with Figure 1 b. The Cu element has an obvious distribution in the entire coating, indicating that Cu2O is evenly distributed in the entire coating, which shows that the coating has a more uniform and dense coating structure, and a more uniform distribution of copper elements is beneficial to the antifouling and antibacterial properties of the coating. Micro-arc oxidation is carried out in an electrolyte with additives, and the resulting Cu distribution is more uniform.

[0054] [Example 3]

[0055] The mixed powder is sprayed onto the surface of the AZ91 alloy by cold spraying, and then the obtained mixed powder is subjected to micro-arc oxidation treatment in the copper-free micro-arc oxidation electrolyte of the present invention to obtain a copper-containing micro-arc oxidation coating. The specific implementation process is as follows:

[0056] 1. AZ91 powder and pure copper powder with a mass ratio of 9:1 were fully and evenly mixed to obtain a mixed powder, and then the mixed powder was sprayed on the surface of the AZ91 alloy by cold spraying to obtain an AZ91-based coating with a thickness of 20 μm and a Cu-doped mass fraction of 10%.

[0057] 2. Cut the AZ91-based coating into sheet-like workpieces and grind them with sandpaper to 2000#, then clean them with alcohol and blow dry them to obtain small test pieces.

[0058] 3. The small test piece was treated in a micro-arc oxidation electrolyte for 20 min using a constant current mode. The micro-arc oxidation electrolyte was the copper-free electrolyte of the present invention: 10 g / L sodium silicate, 6 g / L trisodium phosphate, 5 g / L sodium bicarbonate, and 1 g / L sodium hydroxide.

[0059] 4. After the micro-arc oxidation treatment in the electrolyte is completed, take out the small test piece sample, wash it with running water and blow it dry to obtain a sample. The present invention prefabricates a copper-containing metal-based coating on the surface of the workpiece in advance by spraying, and can obtain a copper-containing micro-arc oxidation layer without changing the original substrate and using a copper-free electrolyte, thereby achieving the purpose of anti-fouling and antibacterial. Using the copper-free electrolyte of the present invention, the micro-arc oxidation voltage climbing rate is faster. Therefore, the film-forming ability in the electrolyte is better, and the desired coating can be obtained in a shorter time. The coating has a more uniform and dense coating structure, and the more uniform distribution of copper elements is beneficial to the anti-fouling and antibacterial properties of the coating.

[0060] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the application concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art shall not depart from the spirit and scope of the present invention, and shall be within the scope of protection of the claims attached to the present invention.

Claims

1. A method for preparing an antifouling and antibacterial micro-arc oxidation product, characterized in that: The steps include: S1. adding copper powder to the workpiece to be micro-arc oxidized; S2. The workpiece to be micro-arc oxidized is oxidized by using a copper-free micro-arc oxidation electrolyte, wherein the copper-free micro-arc oxidation electrolyte comprises a main salt, a pH adjuster and water; or a main salt, a pH adjuster, water and an additive, wherein the mass concentration of the main salt is 5-20 g / L, the mass concentration of the additive is 1-8 g / L, and the mass concentration of the pH adjuster is 0-10 g / L.

2. The preparation method according to claim 1, characterized in that: The S1 specifically comprises: adding the copper-containing powder to a magnesium alloy or an aluminum alloy by a powder metallurgy method or a casting method to obtain a composite material in which the copper-containing powder is evenly distributed in the form of particles, and preparing the composite material into a workpiece to be micro-arc oxidized.

3. The method according to claim 1, characterized in that The S1 specifically includes: after uniformly mixing copper powder with aluminum alloy or magnesium alloy powder, prefabricating a metal coating containing copper powder in the form of particles on the surface of the workpiece by spraying, and using the metal coating as the workpiece to be micro-arc oxidized.

4. The preparation method according to claim 1 or 2, characterized in that: The copper-containing powder is any one or more combinations of pure copper powder, copper alloy powder, and copper oxide powder, and the average particle size of the copper-containing powder is less than 50 μm.

5. The preparation method according to claim 2, characterized in that: The mass fraction of the copper-containing powder added to the magnesium alloy or the aluminum alloy is less than or equal to 20wt%.

6. The preparation method according to claim 1, characterized in that: The main salt is any one or more combinations of sodium silicate, trisodium phosphate, sodium hexametaphosphate, and sodium dihydrogen phosphate.

7. The preparation method according to claim 6, characterized in that: The additive is any one or more combinations of potassium carbonate, sodium bicarbonate, sodium carbonate, ammonium carbonate, calcium carbonate, sodium oxalate and potassium oxalate.

8. The preparation method according to claim 7, characterized in that: The main salt is a combination of sodium silicate and trisodium phosphate, and the mass concentration of the sodium silicate is 10g / L, and the mass concentration of the trisodium phosphate is 6g / L; the additive is sodium bicarbonate, and its mass concentration is 5g / L; the pH adjuster is sodium hydroxide, and its mass concentration is 1g / L.

9. The preparation method according to claim 7, characterized in that: The main salt is a combination of sodium silicate, trisodium phosphate and sodium dihydrogen phosphate, and the mass concentration of the sodium silicate is 10g / L, the mass concentration of the trisodium phosphate is 5g / L, and the mass concentration of the sodium dihydrogen phosphate is 3g / L; the additive is sodium bicarbonate and sodium oxalate, the mass concentration of the sodium bicarbonate is 3g / L, and the mass concentration of the sodium oxalate is 4g / L; the pH adjuster is sodium hydroxide, and the mass concentration is 1g / L.

10. An antifouling and antibacterial micro-arc oxidation product, characterized in that: The product is obtained by the preparation method according to any one of claims 1 to 9.

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