Formation process of composite plasma electrolytic oxidation coating containing zirconium oxides on AM50 magnesium alloy  

AM50镁合金表面含氧化锆的微弧氧化复合涂层的形成过程(英文)

作　　者：刘锋[1] 单大勇[1] 宋影伟[1] 韩恩厚[1] 

机构地区：[1]中国科学院金属研究所金属腐蚀与防护国家重点实验室,沈阳110016

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第4期943-948,共6页中国有色金属学报（英文版）

基　　金：Project(2007CB613705)supported by the National Basic Research Program of China;Project(50901082)supported by the NationalNatural Science Foundation of China

摘　　要：The formation processes of a composite ceramic coating on AM50 magnesium alloy prepared by plasma electrolytic oxidation （PEO） in a K 2 ZrF 6 electrolyte solution were studied by scanning electron microscope （SEM） and energy dispersive X-ray spectroscope （EDX）. Electrochemical impedance spectroscopy （EIS） tests were used to study the variation of the corrosion resistance of the coating during the PEO treatment. The results show that the coating formed on Mg alloy is mainly composed of MgO and MgF 2 when the applied voltage is lower than the sparking voltage, and zirconium oxides start to be deposited on Mg substrate after the potential exceeding the sparking voltage. The corrosion resistance of the coating increases with increasing the applied voltage.采用扫描电镜(SEM)和电子衍射能谱(EDX)研究在含K2ZrF6的溶液中AM50镁合金表面复合微弧体氧化涂层的形成过程。采用电化学阻抗谱(EIS)研究在微弧体氧化制备膜层过程中膜层耐腐蚀性能的变化。结果表明:当电压小于起弧电压时,合金表面膜层的主要成分为MgO和MgF2;当施加电压超过起弧电压时,锆氧化物开始在合金表面沉积,且膜层的耐腐蚀性随着电压的升高而提高。

关 键 词：plasma electrolytic oxidation coating zirconium oxide MGO corrosion resistance 

分 类 号：TG174.451[金属学及工艺—金属表面处理]