AZ91D镁合金阳极氧化与热扩散渗铝复合膜层的研究  

Surface treatment of AZ91D magnesium alloy by aluminum diffusion on anodizing film

作　　者：朱立群[1] 李卫平[1] 吕赛男[1] 

机构地区：[1]北京航空航天大学材料学院,北京100083

出　　处：《材料科学与工艺》2007年第2期158-161,共4页Materials Science and Technology

基　　金：航空科学基金资助项目(04H51002)

摘　　要：将阳极氧化与热扩散相结合对AZ91D镁合金表面进行低温渗铝处理,利用扫描电镜、光学显微镜和X射线衍射仪对所得膜层的形貌、相结构及耐腐蚀性能进行了研究,并对复合膜层改善镁合金基体耐腐蚀性能的过程进行了分析.研究表明,该复合膜层是由MgO和金属间化合物Mg17Al12以及被γ相(Mg17Al12)包裹住的α-Mg晶粒共同组成;AZ91D镁合金表面的阳极氧化和热扩散渗铝复合膜层能显著提高镁合金基体材料的耐腐蚀性能.In order to provide a well adhered, adequate corrosion protection for AZ91D magnesium alloy, a new method was investigated to obtain a composite coating on the alloy by aluminum diffusion after the substrate was anodized. The morphologies, microstructure and corrosion resistance of the coating were also researched. The surface and cross-section morphology of the composite coating were studied by optical microscope and SEM, and the microstructure was measured by X-ray diffusion. The results show that the coating is made up of MgO and intermetallic Mg17Al12 and α-Mg grains surrounded by netlike γ phase （ Mg17Al12 ）. Corrosion test results show that the composite coating by anodizing and aluminum diffusion has better corrosion protection for the AZ91D Mg alloy than the single anodizing film.

关 键 词：AZ91D镁合金 阳极氧化 渗铝 复合膜层 耐腐蚀性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]