镁合金环保型阳极氧化电解液组成优化及膜层性能的评价  

Formula Optimization Study of Environmental-Friendly Anodized Electrolyte for Magnesium Alloys and Evaluation of Film Performance

作　　者：郭兴华[1] 安茂忠[1] 杨培霞[1] 李海先[1] 

机构地区：[1]哈尔滨工业大学化工学院,哈尔滨150001

出　　处：《航空材料学报》2009年第5期44-50,共7页Journal of Aeronautical Materials

基　　金：清华大学摩擦学国家重点实验室开放基金资助项目(SKLT04-09)

摘　　要：以氢氧化钾和硅酸钠为基础,通过添加辅助成膜剂硼酸钠,添加剂碳酸钠,研制了适合于镁合金AZ31B的环保型阳极氧化电解液。通过4因素3水平的正交实验,以氧化膜耐蚀性作为主要评价指标,确定了最佳的电解液组成:氢氧化钾60g/L,硅酸钠70g/L,硼酸钠60g/L,碳酸钠30g/L。动电位极化曲线、电化学阻抗(EIS)、扫描电镜(SEM)研究表明,镁合金经优化后的电解液氧化后,膜层表面光滑、平整,致密性好,对镁合金基体有良好的防护性;能谱仪(EDS)以及X射线衍射仪(XRD)研究表明,氧化膜主要由MgO和Mg2S iO4组成。Anodized film coated on AZ31 B magnesium alloy was prepared under a constant current density in an environmental-friendly electrolyte consisting of potassium hydrate and sodium silicate as the basic electrolyte, sodium borate as the auxiliary filmogen and sodium carbonate as the addition agent. The electrolyte solution was optimized by orthogonal experiment and the suitable concentration of the four kinds of stabilizers mentioned were 60g/L, 70g/L, 60g/L and 30g/L, respectively. Compared with the magnesium substrate, the anodized film prepared in the optimized electrolyte was smooth, compact and anticorrosion by SEM, potentiodynamic polarization curve and EIS; while the composition of the anodized film was consisted of MgO and Mg2SiO4by EDS and XRD.

关 键 词：阳极氧化 镁合金 耐蚀性 环保 

分 类 号：TG174.451[金属学及工艺—金属表面处理]