镁锂合金的腐蚀机理及表面防护方法研究进展

doi:10.16085/j.issn.1000-6613.2017-0198

摘要/Abstract

摘要： 镁锂（Mg-Li）合金具有质量超轻、强度高、延展性好和成形性好等优点，在汽车、航空航天、军事及核工业等领域具有广阔的应用前景。但是高化学活性的锂使该合金易在使用环境中发生腐蚀且难以防护，限制了其广泛应用。因此，研究Mg-Li合金的腐蚀机理并发展有效的防腐蚀技术极为重要。基于近年来国内外的研究进展，本文综述了Mg-Li合金在大气、中性及碱性NaCl溶液和模拟人体体液中的腐蚀机理，介绍了Mg-Li合金在不同环境中的腐蚀过程。同时对Mg-Li合金的表面防护方法作了系统总结，包括阳极氧化、电镀与化学镀、化学转化、涂层及其他表面防腐蚀方法，分析了各种表面防护方法的特点、优势与不足。并对Mg-Li合金表面防护的未来发展进行了展望，提出通过涂层的复合化、功能化及自修复化可以提高涂层对Mg-Li合金的防腐蚀性能和实用性。

关键词: 镁锂合金, 腐蚀, 表面, 阳极氧化, 化学镀, 化学转化膜, 涂层

Abstract: Magnesium-lithium(Mg-Li)alloy have attracted considerable interest in automobiles,aerospace,military and nuclear industries because of their super lightweight,high strength,high ductility and good formability. However,the high chemical activity of lithium means the Mg-Li alloys are susceptible to corrode in applied environment and difficult to protect,which limit their widespread practical application. Therefore,it is important to investigate the corrosion mechanism of Mg-Li alloys and develop efficiently anticorrosion technology. In this paper,a review was provided on the current status of corrosion mechanism of Mg-Li alloys in atmosphere,neutral and alkaline NaCl solution and Hank's solution based on recent progress at home and abroad. The corrosion behavior of Mg-Li alloys in different environment was introduced. The research progress of surface protection technologies for Mg-Li alloys were systematically summarized,including anodic oxidation,electroplating and electroless plating,chemical conversion coatings,coating and other surface anticorrosion methods. The advantages and disadvantages of these methods were analyzed. The future developments of the surface protection technology for Mg-Li alloy were also prospected. This paper proposed that anticorrosion and practicability of coatings for Mg-Li alloys could improve by composite,functionalization and self-healing.

Key words: Mg-Li alloy, corrosion, surface, anodic oxidation, electroless plating, chemical conversion coatings, coatings

中图分类号:

TB31

高晓辉, 李玉峰, 祝晶晶, 景晓燕. 镁锂合金的腐蚀机理及表面防护方法研究进展[J]. 化工进展, 2017, 36(09): 3373-3379.

GAO Xiaohui, LI Yufeng, ZHU Jingjing, JING Xiaoyan. Corrosion mechanism and surface protection method for magnesium-lithium alloy[J]. Chemical Industry and Engineering Progress, 2017, 36(09): 3373-3379.

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