| XIA Xian-chao,PAN Yue,YUAN Xing,NIE Jing-jing,SUN Jing-li,YUAN Yong,DONG Ze-hua.Research Progress of Surface Corrosion Protection Technology for Mg Alloys[J],52(5):37-50, 70 |
| Research Progress of Surface Corrosion Protection Technology for Mg Alloys |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.05.004 |
| KeyWord:Mg alloys corrosion resistance surface protection composite coatings functional coatings intelligent coatings |
| Author | Institution |
| XIA Xian-chao |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| PAN Yue |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| YUAN Xing |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| NIE Jing-jing |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| SUN Jing-li |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| YUAN Yong |
Shanghai Spaceflight Precision Machinery Institute, Shanghai , China |
| DONG Ze-hua |
School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan , China |
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| Abstract: |
| The relatively high corrosion susceptibility of Mg alloys seriously restricts their large-scale use. Surface corrosion protection technologies are used to improve the corrosion resistance and prolong the service life of Mg alloys. Hence, use of reliable surface corrosion protection coatings is the key to break through the bottleneck of Mg alloy application. Starting from the classification of surface corrosion protection technologies for Mg alloys, the basic principles of various protection technologies were expounded, and the advantages, disadvantages and application scope of various technologies were clarified. By comparing those surface corrosion protection technologies and introducing relevant research progress in China and abroad, the direction of future development was pointed out, which provided theoretical basis and technical support for the development of high-quality, multi-functional and anti-corrosive coatings for Mg alloys. The research progress of corrosion protection technology for Mg alloys in recent years is reviewed, including electrochemical methods, chemical methods and other surface corrosion protection methods. Among them, the inherent defects of chemical conversion, anodic oxidation and micro-arc oxidation lead to great loss of corrosion protection performance and durability, and these coatings are rarely used as the final protective layer. Electroless plating/electroplating process has high difficulty and cost in recovery of treatment solution and plating solution, and it is easy to react with Mg alloy substrate, resulting in loose coating structure, which affects the corrosion resistance. Laser treatment, particle injection, vapor deposition, spraying and other technologies require higher equipment and cost more. After years of development, the theoretical research and application of surface protection technologies for Mg alloys have been gradually perfected, and existing surface protection methods can provide corrosion protection for Mg alloys to a certain extent. However, with the expansion of Mg alloy applications, related structural parts face harsh service environments frequently. Therefore, single surface corrosion protection technology is difficult to satisfy the urgent demand for Mg alloys in the industrial field, and the composite coatings prepared by a combination of multiple surface treatment technologies have broad prospects. Nowadays, the surface protection technology of Mg alloys is developing in the direction of functional and intelligent composite coatings, and puts forward higher requirements in the safety and environmental protection of preparation process. In the future, in addition to ensuring high corrosion resistance, the development of multi-functional intelligent coatings is of great practical and long-term significance to improve the long-term protection of protective layer and broaden the application range of Mg alloys. |
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