镁合金表面陶瓷/铜复合膜层的性能研究  

Performance of Synergistic Coating on Magnesium Alloy

作　　者：蒋永锋[1] 周海涛[1] 曾苏民[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《表面技术》2009年第3期1-3,共3页Surface Technology

基　　金：中国博士后科学基金项目(20070420821);湖南省博士后科研资助专项计划项目(2008RS4019)

摘　　要：镁合金具有比重小,比强度、比刚度高,阻尼系数小,电磁屏蔽性能及铸造性能优良等特点,然而其耐蚀性能差。结合微弧氧化和化学镀铜技术在镁合金表面制备了复合膜层,以提高其耐蚀性和装饰效果。用金相显微镜和扫描电子显微镜及极化曲线研究了膜层的性能。研究结果表明:复合膜层由基体、陶瓷层、铜层构成,其微观组织结合良好。复合膜层的腐蚀电位较镁合金基体提高了300mV以上,腐蚀电流降低至基体的8%。用热震法测其结合强度可重复10次以上。Magnesium and magnesium alloys exhibit an attractive excellent performance combination low density with strength and stiffness associated with good castability, high damping capacity and electromagnetic shielding. However, the high chemical reactivity of magnesium results in poor corrosion resistance. The synergistic coating by combination plasma electrolytic oxidation and electroless copper plating on magnesium alloy were prepared to improve corrosion resistance and decoration. Optical microscopy and scan electron microscopy associated potential curve were used to investigate the performance. The results show that synergistic coating is composed of substrate, ceramic layer and copper layer, which corrosion potential of synergistic coating is higher above 300mV that of magnesium alloy substrate and corrosion po- tential of synergistic coating reduces by 8% that magnesium alloy substrate. The bonding strengths of layers in synergistic coating are over 10 times by thermal shock test.

关 键 词：镁合金 复合膜层 微弧氧化 化学镀 镀铜 性能分析 

分 类 号：TQ153.4[化学工程—电化学工业]