AZ91D铸造镁合金交流脉冲双极微弧电沉积陶瓷膜  

Microarc Electrodeposition of Ceramic Coatings on Double Electrodes of AZ91D Magnesium Alloy by AC Pulse Method

作　　者：刘元刚[1] 张巍[1] 李久青[1] 申磊[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《北京科技大学学报》2004年第1期73-77,共5页Journal of University of Science and Technology Beijing

基　　金：国家自然科学基金资助项目(No.50122118)

摘　　要：利用交流脉冲方法在AZ91D铸造镁合金表面成功实现阴、阳极微弧电沉积陶瓷膜,并使用SEM和XRD等手段对陶瓷膜的厚度、组织形貌、成分、结构和耐蚀性作了相应研究分析.结果表明,应用交流脉冲方法不仅能够在AZ91D铸造镁合金上实现阴、阳双极微弧电沉积陶瓷膜,同时在阴、阳极陶瓷膜中电沉积有稀土元素Ce.通过比较动电位扫描极化曲线和交流阻抗分析发现阴、阳极微弧氧化处理后AZ91D镁合金的耐蚀性得到显著提高.It was carried out successfully to microarc electrodeposit ceramic coatings on the anode and cathode of AZ91D magnesium cast alloy with AC pulse method. The thicknesses, morphologies, composition and micro-structures of the coatings were studied by scanning electron microscopy (SEM) and X ray diffraction (XRD). Rare earth element as Ce can deposit in the anode and cathode ceramic coatings on AZ91D cast alloy besides that both electrodes have formed the same characteristic ceramic coatings. By comparing the electrochemical impendence spectroscopies (EIS) and potentiodynamic scanning polarization curves of the anode and cathode coatings, it was found that microarc oxidation (MAO) coatings on the anode and cathode of AZ91D have better corrosion resistance than that of bare AZ91D magnesium cast alloy.

关 键 词：交流脉冲方法 双极微弧电沉积陶瓷膜 AZ91D铸造镁合金 耐蚀性 表面改性处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG174.44[金属学及工艺—金属材料]