CN112680090A - Preparation method of corrosion-resistant self-repairing coating on surface of magnesium alloy - Google Patents
Preparation method of corrosion-resistant self-repairing coating on surface of magnesium alloy Download PDFInfo
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Abstract
The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy comprises the following steps: the method comprises the following steps: pre-treating; step two: preparing a micro-arc oxidation film; step three: hydrotalcite is loaded in the micropores of the micro-arc oxidation film; step four: preparing a polymer coating layer; step five: and (4) coating the macromolecular coating layer prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy. According to the corrosion-resistant self-repairing coating on the surface of the magnesium alloy, the hydrotalcite loaded in the micropores of the micro-arc oxidation film has compactness, the micro-arc oxidation film can be well sealed, and the hydrotalcite has an intercalation structure, can absorb and limit corrosive chloride ions, and can effectively improve the self-repairing performance of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
Description
Technical Field
The invention belongs to a material surface treatment technology, and relates to a preparation method of a corrosion-resistant self-repairing coating on a magnesium alloy surface.
Background
The eighth storage amount of magnesium element on the crust is about 2.35 percent of the crust mass, the third content of magnesium element in the metal which can be used as a structural material is about 1.3kg of magnesium in per cubic meter of seawater, so that the magnesium resource is inexhaustible, and the high-standard extraction can be carried out. The density of the magnesium alloy is about 1.8g.cm-3The composite material is the lightest structural metal material, has the characteristics of small density, high specific strength, high thermal conductivity, good shock absorption capacity, excellent dimensional stability, excellent electromagnetic shielding property and the like, and is used in transportation (engines, hubs, gearboxes, seats, instrument panels, steering columns and the like), aerospace (engine parts, propellers, teeth and the like)Wheel box, support structure) and electronic devices (mobile phones, computers, televisions, cameras, etc.). Meanwhile, the magnesium alloy has good biocompatibility, bioactivity and degradability, and is a biomedical material with great prospect.
After the magnesium alloy is coated reasonably, the corrosion resistance can be compared favorably with that of steel in normal environment. However, in the service process of the magnesium alloy component, the protective coating on the surface is inevitably aged or damaged, and then corrosion can be initiated from the damaged part of the coating, thereby causing the coating to blister and fall off. There is therefore a need to develop self-healing coatings to inhibit corrosion of bare metal where the coating fails.
Patent CN109680318B discloses a preparation method of a phosphate-based magnesium alloy surface corrosion-resistant self-repairing coating, which comprises the following steps: (1) preparing an electrolyte: preparing micro-arc oxidation electrolyte according to the type of the magnesium alloy growing the oxide layer and the component type of the required oxide layer; (2) generating a micro-arc oxidation film: placing a metal matrix needing to grow an oxide film as an anode and a graphite plate as a cathode in the micro-arc oxidation electrolyte obtained in the step (1); adjusting the distance between the cathode and anode to 10-1000mm according to the size of the metal substrate workpiece needing to grow the oxide layer; the micro-arc oxidation adopts a direct current pulse power supply, a constant voltage or constant current mode is selected, and the current density of the constant current mode is 1-10A/dm2The output voltage is 200-600V in the constant voltage mode, the regulation pulse frequency is 50-5000Hz, and the pulse duty ratio is 10% -70%; (3) preparing a self-repairing layer: preparing phosphate solution according to the component types of the self-repairing layer, wherein the phosphate solution comprises phosphate and a corrosion inhibitor, the pH value is 3-6, and the phosphate concentration is 30-120 g/L; and (3) soaking the magnesium alloy with the micro-arc oxidation film prepared in the step (2) in phosphate solution to prepare a film layer through deposition reaction, wherein the preparation temperature is 30-90 ℃, and the preparation time is 10-180 min. The method uses magnesium phosphate as a deposition layer and phosphate as a pH buffering agent, but due to the pH buffering effect of the magnesium phosphate, the slow release capacity is obvious at lower or higher pH, and the corrosion inhibition effect which can only occur in a neutral alkaline environment is also hindered.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a preparation method of a corrosion-resistant self-repairing coating on the surface of a magnesium alloy. Solves the problems of poor corrosion resistance of magnesium alloy and alloy thereof in the prior art and limited corrosion protection effect provided by the traditional surface treatment technology.
In order to solve the problems, the invention is mainly realized by the following technical scheme:
the preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy comprises the following steps:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer, grease and the like on the surface of a sample, and then washing the sample clean by using deionized water; and drying to obtain the pretreated magnesium alloy.
Step two: preparing a micro-arc oxidation film: and preparing a micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching with deionized water, and airing.
Step three: loading hydrotalcite in micropores of the micro-arc oxidation film, placing the magnesium alloy prepared in the step two in a vacuum environment at room temperature, slowly adding a mixed solution of magnesium nitrate and aluminum nitrate to completely immerse the magnesium alloy, and keeping the magnesium alloy immersed for 5-10 min; after bubbles on the surface of the magnesium alloy disappear, taking out the magnesium alloy; immersing the magnesium alloy into a container containing a mixed solution of sodium hydroxide, sodium carbonate and sodium molybdate, controlling the pH to be 9-10, carrying out ultrasonic treatment for 30min, transferring the mixture in the container into a hydrothermal kettle, placing the hydrothermal kettle in a high-temperature reaction box for reaction for 5h, taking out, cleaning and drying;
step four: preparing a polymer coating layer: heating and melting polyurethane-methyl acrylate, adding phytic acid, nano magnesium aluminum silicate and quinolone, and violently stirring at 180-200 ℃ to uniformly disperse the phytic acid, the nano magnesium aluminum silicate and the quinolone to obtain a high-molecular coating material;
step five: and (4) coating the macromolecular coating material prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
Preferably, in the second step, the electrolyte is maintained at 40-50 ℃ in the micro-arc oxidation processThe components of the hydrolysate are 5-10 parts of sodium dihydrogen phosphate, 5-10 parts of sodium fluoride, 20-30 parts of hexamethylenetetramine and 50-60 parts of water; the electrical parameter of the micro-arc oxidation film is 500-1000Hz pulse frequency, 2-6A/dm2Constant-current oxidation is carried out until the cell pressure is increased to 400-460V, and then constant-voltage oxidation is carried out for 10-30 min.
Preferably, the molar ratio of the magnesium nitrate solution to the aluminum nitrate in the third step is 3-5: 1, and the concentration of the aluminum nitrate solution is 0.1-0.3 mol/L; the molar ratio of the sodium hydroxide to the sodium carbonate to the sodium molybdate is 1-1.5: 1: 1.
Preferably, the ultrasonic power in the third step is 200W; the temperature of the high-temperature reaction chamber was 120 ℃.
Preferably, the mass of the phytic acid in the fourth step is 10-15% of that of the polyurethane-methyl acrylate; the mass of the quinolone accounts for 5-10% of that of the polyurethane-methyl acrylate; the mass of the nano aluminum magnesium silicate is 3-5% of that of polyurethane-methyl acrylate.
The invention has the following beneficial effects:
according to the invention, magnesium nitrate and aluminum nitrate are loaded in the micropores of the micro-arc oxidation film and then react with sodium hydroxide, sodium carbonate and sodium molybdate to obtain the micro-arc oxidation film loaded with hydrotalcite, the hydrotalcite loaded in the micropores of the micro-arc oxidation film has compactness, the micro-arc oxidation film can be well sealed, and the hydrotalcite has an intercalation structure, can absorb and limit corrosive chloride ions, and can effectively improve the self-repairing performance of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy. In addition, the polyurethane-methyl acrylate has memory performance, and can further improve the self-repairing performance of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy. Free Mg of phytic acid and quinolone in high-molecular coating layer2+Binding to form an insoluble chelate. And hydrotalcite contains Mg2+The magnesium alloy surface corrosion-resistant self-repairing coating can also form an insoluble chelate with phytic acid and quinolone, so that the hydrotalcite and the molecular coating generate a synergistic effect, and the self-repairing performance of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy is better improved.
Detailed Description
The present invention will be described in further detail with reference to examples.
Micro-arcThe preparation method of the oxide film comprises the following steps: and (3) putting the magnesium alloy matrix into electrolyte, and performing plasma electrolytic oxidation in a pulse mode. The electrolyte is kept at 40-50 ℃ in the micro-arc oxidation process, and the components of the electrolyte comprise 5-10 parts of sodium dihydrogen phosphate, 5-10 parts of sodium fluoride, 20-30 parts of hexamethylenetetramine and 50-60 parts of water; the electrical parameter of the micro-arc oxidation film is 500-1000Hz pulse frequency, 2-6A/dm2Constant-current oxidation is carried out until the cell pressure is increased to 400-460V, and then constant-voltage oxidation is carried out for 10-30 min.
Example 1
The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy comprises the following steps:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer, grease and the like on the surface of a sample, and then washing the sample clean by using deionized water; and drying to obtain the pretreated magnesium alloy.
Step two: preparing a micro-arc oxidation film: preparing a micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching with deionized water, and airing; wherein the electrolyte is kept at 40 ℃ in the micro-arc oxidation process, and the components of the electrolyte comprise 5 parts of sodium dihydrogen phosphate, 5 parts of sodium fluoride, 20 parts of hexamethylenetetramine and 50 parts of water; the electrical parameter of the micro-arc oxidation film is the pulse frequency of 500Hz, 2A/dm2Constant current oxidation is carried out until the cell pressure is increased to 400V, and then constant voltage oxidation is carried out for 30 min.
Step three: loading hydrotalcite in the micropores of the micro-arc oxidation film: at room temperature, placing the magnesium alloy prepared in the second step in a vacuum environment of-0.1 MPa, slowly adding a mixed solution of magnesium nitrate and aluminum nitrate according to the molar ratio of 3:1, wherein the concentration of the aluminum nitrate solution is 0.1mol/L, and completely immersing the magnesium alloy for 5-10 min; after bubbles on the surface of the magnesium alloy disappear, taking out the magnesium alloy; immersing the magnesium alloy into a container containing a mixed solution of sodium hydroxide, sodium carbonate and sodium molybdate according to the molar ratio of 1:1:1, controlling the pH value to be 9, carrying out ultrasonic treatment for 30min by using an ultrasonic device with the ultrasonic power of 200W, transferring the mixture in the container into a hydrothermal kettle, placing the hydrothermal kettle in a high-temperature reaction box at 120 ℃ for reaction for 5h, taking out, washing and drying.
Step four: preparing a polymer coating layer: heating and melting polyurethane-methyl acrylate, adding phytic acid accounting for 10% of the mass of the polyurethane-methyl acrylate, nano magnesium aluminum silicate accounting for 3% of the mass of the polyurethane-methyl acrylate and quinolone accounting for 5% of the mass of the polyurethane-methyl acrylate, and violently stirring at 180 ℃ to uniformly disperse the materials to obtain the high-molecular coating material.
Step five: and (4) coating the macromolecular coating layer prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
Example 2
The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy comprises the following steps:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer, grease and the like on the surface of a sample, and then washing the sample clean by using deionized water; and drying to obtain the pretreated magnesium alloy.
Step two: preparing a micro-arc oxidation film: preparing a micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching with deionized water, and airing; wherein the electrolyte is kept at 40-50 ℃ in the micro-arc oxidation process, and the components of the electrolyte comprise 7 parts of sodium dihydrogen phosphate, 7 parts of sodium fluoride, 24 parts of hexamethylenetetramine and 54 parts of water; the electric parameter of the micro-arc oxidation film is the pulse frequency of 700Hz, 4A/dm2Constant current oxidation is carried out until the cell pressure is increased to 440V, and then constant voltage oxidation is carried out for 20 min.
Step three: loading hydrotalcite in the micropores of the micro-arc oxidation film: at room temperature, placing the magnesium alloy prepared in the second step in a vacuum environment of-0.1 MPa, and slowly adding a mixed solution of magnesium nitrate and aluminum nitrate according to a molar ratio of 4:1, wherein the concentration of the aluminum nitrate solution is 0.2mol/L, so that the magnesium alloy is completely immersed and kept immersed for 5-10 min; after bubbles on the surface of the magnesium alloy disappear, taking out the magnesium alloy; immersing the magnesium alloy into a container containing a mixed solution of sodium hydroxide, sodium carbonate and sodium molybdate according to the molar ratio of 1.2:1:1, controlling the pH value to be 10, carrying out ultrasonic treatment for 30min by using an ultrasonic device with the ultrasonic power of 200W, transferring the mixture in the container into a hydrothermal kettle, placing the hydrothermal kettle in a high-temperature reaction box at 120 ℃ for reaction for 5h, taking out, washing and drying.
Step four: preparing a polymer coating layer: heating and melting polyurethane-methyl acrylate, adding phytic acid accounting for 12% of the mass of the polyurethane-methyl acrylate, nano magnesium aluminum silicate accounting for 4% of the mass of the polyurethane-methyl acrylate and quinolone accounting for 7% of the mass of the polyurethane-methyl acrylate, and violently stirring at 190 ℃ to uniformly disperse the materials to obtain the high-molecular coating material.
Step five: and (4) coating the macromolecular coating layer prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
Example 3
The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy comprises the following steps:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer, grease and the like on the surface of a sample, and then washing the sample clean by using deionized water; and drying to obtain the pretreated magnesium alloy.
Step two: preparing a micro-arc oxidation film: preparing a micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching with deionized water, and airing; wherein the electrolyte is kept at 50 ℃ in the micro-arc oxidation process, and the components of the electrolyte comprise 10 parts of sodium dihydrogen phosphate, 10 parts of sodium fluoride, 30 parts of hexamethylenetetramine and 60 parts of water; the electrical parameter of the micro-arc oxidation film is pulse frequency of 1000Hz, 6A/dm2Constant current oxidation is carried out until the cell pressure is increased to 460V, and then constant voltage oxidation is carried out for 10 min.
Step three: loading hydrotalcite in the micropores of the micro-arc oxidation film: at room temperature, placing the magnesium alloy prepared in the second step in a vacuum environment of-0.1 MPa, and slowly adding a mixed solution of magnesium nitrate and aluminum nitrate according to a molar ratio of 5:1, wherein the concentration of the aluminum nitrate solution is 0.3 mol/L; completely immersing the magnesium alloy for 5-10 min; after bubbles on the surface of the magnesium alloy disappear, taking out the magnesium alloy; immersing the magnesium alloy into a container containing a mixed solution of sodium hydroxide, sodium carbonate and sodium molybdate according to the molar ratio of 1.5:1:1, controlling the pH value to be 10, carrying out ultrasonic treatment for 30min by using an ultrasonic device with the ultrasonic power of 200W, transferring the mixture in the container into a hydrothermal kettle, placing the hydrothermal kettle in a high-temperature reaction box at 120 ℃ for reaction for 5h, taking out, washing and drying.
Step four: preparing a polymer coating layer: heating and melting polyurethane-methyl acrylate, adding phytic acid accounting for 15% of the mass of the polyurethane-methyl acrylate, nano magnesium aluminum silicate accounting for 5% of the mass of the polyurethane-methyl acrylate and quinolone accounting for 10% of the mass of the polyurethane-methyl acrylate, and violently stirring at 200 ℃ to uniformly disperse the materials to obtain a high polymer coating material;
step five: and (4) coating the macromolecular coating layer prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
Comparative example 1
The difference between the comparative example 1 and the example 1 is that the micro-arc oxidation film is not loaded with hydrotalcite, the polymer coating layer is only composed of polyurethane-methyl acrylate, and the preparation method is as follows:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer, grease and the like on the surface of a sample, and then washing the sample clean by using deionized water; and drying to obtain the pretreated magnesium alloy.
Step two: preparing a micro-arc oxidation film: preparing a micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching the micro-arc oxidation film with deionized water, and airing, wherein the electrolyte is kept at 40 ℃ in the micro-arc oxidation process, and the components of the electrolyte comprise 5 parts of sodium dihydrogen phosphate, 5 parts of sodium fluoride, 20 parts of hexamethylenetetramine and 50 parts of water; the electrical parameter of the micro-arc oxidation film is the pulse frequency of 500Hz, 2A/dm2Constant current oxidation is carried out until the cell pressure is increased to 400V, and then constant voltage oxidation is carried out for 30 min.
Step three: preparing a polymer coating layer: heating and melting polyurethane-methyl acrylate for later use.
Step four: and (4) coating the macromolecular coating layer prepared in the third step on the surface of the magnesium alloy prepared in the second step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
And (3) performing a salt spray test according to a GB/T10125-2012 national standard neutral salt spray corrosion test, and respectively placing the magnesium alloy surface composite self-repairing coating samples prepared in the embodiments 1-3 and the magnesium alloy surface coating prepared in the comparative example 1 in an YWX/Q-250B type salt spray test box for performing a 3000-hour neutral salt spray test (NSS). The degree of corrosion of the test piece was evaluated according to GB/T6461-2002, and the results are shown in Table 1:
TABLE 1 evaluation of Corrosion rating of test specimens after NSS3000h (Rp)
| Example 1 | Example 2 | Example 3 | Comparative example 1 | |
| Grade | 9 | 10 | 10 | 4 |
The sample result shows that the magnesium alloy prepared by the preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy can obviously improve the corrosion resistance and service life of the magnesium alloy.
The present invention includes but is not limited to the above embodiments, and any equivalent replacement or partial modification made under the spirit of the present invention will be considered to be within the protection scope of the present invention.
Claims (5)
1. A preparation method of a corrosion-resistant self-repairing coating on the surface of magnesium alloy is characterized by comprising the following steps: the preparation method comprises the following steps:
the method comprises the following steps: pretreating, namely sequentially polishing a magnesium alloy matrix by using 400#, 800#, 1200# and 2000# sandpaper, removing an oxide layer and grease on the surface of a sample, then washing the sample clean by using deionized water, and drying to obtain a pretreated magnesium alloy;
step two: preparing a micro-arc oxidation film, namely preparing the micro-arc oxidation film with a microporous structure on the surface of the magnesium alloy by adopting a micro-arc oxidation method, leaching by using deionized water, and airing;
step three: loading hydrotalcite in micropores of the micro-arc oxidation film, placing the magnesium alloy prepared in the step two in a vacuum environment at room temperature, slowly adding a mixed solution of magnesium nitrate and aluminum nitrate to completely immerse the magnesium alloy, and keeping the magnesium alloy immersed for 5-10 min; after bubbles on the surface of the magnesium alloy disappear, taking out the magnesium alloy; immersing the magnesium alloy into a container containing a mixed solution of sodium hydroxide, sodium carbonate and sodium molybdate, controlling the pH to be 9-10, carrying out ultrasonic treatment for 30min, transferring the mixture in the container into a hydrothermal kettle, placing the hydrothermal kettle in a high-temperature reaction box for reaction for 5h, taking out, cleaning and drying;
step four: preparing a high-molecular coating layer, heating and melting polyurethane-methyl acrylate, adding phytic acid, nano magnesium aluminum silicate and quinolone, and violently stirring at 180-200 ℃ to uniformly disperse the phytic acid, nano magnesium aluminum silicate and quinolone to obtain a high-molecular coating material;
step five: and (4) coating the macromolecular coating material prepared in the fourth step on the surface of the magnesium alloy prepared in the third step, and curing and drying to obtain the corrosion-resistant self-repairing coating on the surface of the magnesium alloy.
2. The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy as claimed in claim 1, wherein the preparation method comprises the following steps: in the second step, the electrolyte is maintained at 40-50 ℃ in the micro-arc oxidation process, and the electrolyte comprises 5-10 parts of sodium dihydrogen phosphate, 5-10 parts of sodium fluoride and 20-30 parts of sodium dihydrogen phosphate for six timesMethyl tetramine; the electrical parameter of the micro-arc oxidation is 500-1000Hz pulse frequency, 2-6A/dm2Constant-current oxidation is carried out until the cell pressure is increased to 400-460V, and then constant-voltage oxidation is carried out for 10-30 min.
3. The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy as claimed in claim 1, wherein the preparation method comprises the following steps: in the third step, the molar ratio of magnesium nitrate to aluminum nitrate is 3-5: 1, and the concentration of an aluminum nitrate solution is 0.1-0.3 mol/L; the molar ratio of the sodium hydroxide to the sodium carbonate to the sodium molybdate is 1-1.5: 1: 1.
4. The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy as claimed in claim 1, wherein the preparation method comprises the following steps: the ultrasonic power in the third step is 200W; the temperature of the high-temperature reaction chamber was 120 ℃.
5. The preparation method of the corrosion-resistant self-repairing coating on the surface of the magnesium alloy as claimed in claim 1, wherein the preparation method comprises the following steps: in the fourth step, the mass of the phytic acid is 10-15% of that of polyurethane-methyl acrylate; the mass of the quinolone accounts for 5-10% of that of the polyurethane-methyl acrylate; the mass of the nano aluminum magnesium silicate is 3-5% of that of polyurethane-methyl acrylate.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114941164A (en) * | 2022-06-16 | 2022-08-26 | 河南大学 | Preparation method of novel difunctional composite coating on surface of magnesium alloy |
| CN115433478A (en) * | 2022-09-23 | 2022-12-06 | 中国船舶重工集团公司第七二五研究所 | Dual self-repairing anticorrosive coating and preparation method thereof |
| CN116555860A (en) * | 2023-07-10 | 2023-08-08 | 上海嘉朗实业南通智能科技有限公司 | Corrosion-resistant aluminum alloy engine bracket and processing technology thereof |
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2020
- 2020-12-04 CN CN202011400172.XA patent/CN112680090A/en not_active Withdrawn
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| 刘丹: "基于微弧氧化膜多孔性的镁合金双重自修复涂层的制备及修复机理研究", 《中国优秀博硕士学位论文全文数据库（博士）工程科技I辑》 * |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941164A (en) * | 2022-06-16 | 2022-08-26 | 河南大学 | Preparation method of novel difunctional composite coating on surface of magnesium alloy |
| CN114941164B (en) * | 2022-06-16 | 2024-01-19 | 河南大学 | Preparation method of magnesium alloy surface dual-function composite coating |
| CN115433478A (en) * | 2022-09-23 | 2022-12-06 | 中国船舶重工集团公司第七二五研究所 | Dual self-repairing anticorrosive coating and preparation method thereof |
| CN116555860A (en) * | 2023-07-10 | 2023-08-08 | 上海嘉朗实业南通智能科技有限公司 | Corrosion-resistant aluminum alloy engine bracket and processing technology thereof |
| CN116555860B (en) * | 2023-07-10 | 2023-09-22 | 上海嘉朗实业南通智能科技有限公司 | Corrosion-resistant aluminum alloy engine bracket and processing technology thereof |
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Application publication date: 20210420 |