镁合金微弧氧化膜的微观结构及耐蚀性研究  

Microstructure and Corrosion Resistance of Ceramic Coating on Magnesium Alloy

作　　者：卫中领[1] 陈秋荣[1] 郭歆聪[1] 丁翠红[1] 徐乃欣[1] 黄元伟[1] 

机构地区：[1]中科院上海微系统与信息技术研究所金属腐蚀与防护技术中心,上海200050

出　　处：《材料保护》2003年第10期21-23,共3页Materials Protection

基　　金：上海市重点科技攻关计划项目(021111029)

摘　　要：　通过自主研究的微弧氧化工艺在AZ91D镁合金表面获得了表面质量良好的彩色陶瓷质氧化膜。利用EPMA-EDS、XRD等表面分析手段,研究了微弧氧化膜层的截面形貌和相结构,并采用NaCl溶液浸泡试验和中性盐雾试验考察了氧化膜的耐腐蚀性能。结果显示,氧化膜分成内外两层,外层为尖晶石型的Mg、Al的硅氧化合物陶瓷膜,具有坚硬的特点;内层为含少量硅的Mg、Al复合氧化物,与基体结合牢固,结构致密,形成了硬度和韧性的良好组合。氧化膜具有极佳的耐蚀性,性能优于铬酸盐阳极氧化膜。A novel colorful film was formed on the surface of AZ91D magnesium alloy through the new micro\|arc oxidation technology-Simanode. The microstructures, chemical composition and phase structures of ceramic coating were studied by means of EPMA\|EDS and XRD, and the corrosion resistance of oxide coating was investigated by brine immersing corrosion test and neutral salt spray test. The results indicated that the oxide coating included two layer: the outer layer was silica ceramic coating of spinel type with high hardness, and the inner layer was silicon\|containing Mg\|Al complex oxide that conjoined strongly to the matrix. The magnesium alloys with ceramic coating had excellent corrosion resistance and its properties were obviously better than those of chromate anodic treatment. 

关 键 词：镁合金 微弧氧化 微观结构 耐蚀性 

分 类 号：TG174.44[金属学及工艺—金属表面处理]