AM 60B镁合金微弧氧化膜层的结构与性能研究  

Study on structure and properties of microarc oxidation coating formed on AM60B magnesium alloy

作　　者：梁军[1] 郭宝刚[1] 田军[1] 刘惠文[1] 周金芳[1] 徐洮[1] 

机构地区：[1]中国科学院兰州化学物理研究所固体润滑国家重点实验室

出　　处：《材料科学与工艺》2007年第3期309-312,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(5032300750271080);国家高技术研究发展计划资助项目(2003AA305670);创新研究群体科学基金资助项目(50421502)

摘　　要：为了提高镁合金的耐腐蚀性能,用微弧氧化方法在AM60B镁合金表面生成了氧化物膜层.利用扫描电镜、X射线衍射分析了膜层的形貌、结构和组成.研究表明,氧化膜可分为两层,外层疏松多孔,内层结构致密,膜层主要由MgO、Mg2SiO4和少量MgAl2O4相组成,从外层到内层,Mg2SiO4相含量减少,MgO相含量增大.与镁合金基体相比,氧化物膜层表面硬度提高7-8倍.在质量分数为3.5%NaCl溶液中的动电位极化测试表明,微弧氧化处理使镁合金的耐蚀性能得到了明显提高.Oxidation coatings were produced on AM60B Mg alloy substrates using the Microarc oxidation （MAO） technique in order to improve the anti-corrosion property of Mg alloy. The morphology, structure and composition of oxidation coatings were investigated by SEM and XRD. The results show that there are two layers in microarc oxidation coating, of which outer layer is loose and porous, inner layer is dense in structure. The coating is mainly composed of MgO, Mg2SiO4 and little MgAl2O4. The content of Mg2SiO4 decreases while MgO increases from outer layer to inner layer. The surface microhardness of MAO coatings is 7 ～ 8 times higher than Mg alloy substrate. The potentiodynamic polarization test in 3.5wt% NaCI solution indicates that the oxidation coating enhanced evidently the anti-corrosion of the magnesium alloy.

关 键 词：微弧氧化 镁合金 氧化膜 耐蚀性 

分 类 号：TG174.451[金属学及工艺—金属表面处理]