镁合金的腐蚀与微弧氧化膜层研究

Summary on Corrosion Behavior and Micro-arc Oxidation for Magnesium Alloys

在论述镁合金腐蚀特性与表面自然氧化膜微观结构形成过程的基础上,分析并总结了镁合金发生电偶腐蚀、点蚀、应力腐蚀开裂和腐蚀疲劳的原因和防腐措施。从工艺过程、膜层结构、耐蚀性、耐磨性、膜层检测与修复以及封孔处理等方面对镁合金微弧氧化(MAO)技术进行了系统介绍。重点分析了MAO陶瓷膜层的耐蚀性及其影响因素。总结了陶瓷膜层发生滑动磨损、微动磨损和冲击磨损的机理。MAO封孔处理可提高整个膜层的致密度,进一步提升了MAO陶瓷层的耐蚀耐磨能力。

Corrosion phenomena such as galvanic corrosion, pitting, stress corrosion cracking and corrosion fatigue as well as the relevant anti-corrosion measures for magnesium alloys were summarized and analyzed. The micro- arc oxidation(MAO) technology for Mg- alloys was introduced in the aspects of process technique, film structure, corrosion resistance, abrasion resistance, sealing treatment, film inspection and post- repair processing etc., while, the effect of structure and thickness of films on their corrosion resistance was emphasized. The performance of sliding wear, fretting wear and impact wear of the MAO films was also introduced. It is noted that a proper sealing treatment can effectively improved the entire film density, and thereby the corrosion resistance of the MAO films.