Investigation of rare earth sealing of porous micro-arc oxidation coating formed on AZ91D magnesium alloy

查看全文 作　　者：[1]M.Laleh;Farzad [1]Kargar;A.Sabour [1]Rouhaghdam

机构地区：[1]Department of Materials Engineering,Faculty of Engineering,Tarbiat Modares University

出　　处：《Journal of Rare Earths》索引2012年第30卷第12期,共5页

摘　　要：Magnesium and its alloys have been used in many industries, but they are reactive and require protection against aggressive envi-ronments. In this study, oxide coatings were applied on AZ91D magnesium alloy using micro-arc oxidation (MAO) process. Then, in order to seal the pores of the MAO coatings, the samples were immersed in cerium bath for different times. The surface morphologies and composi-tions of the coatings were analyzed by scanning electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS), respectively. The corrosion behavior of the coatings was investigated with electrochemical impedance spectroscopy (EIS) and potentiodynamic polariza-tion tests in 3.5 wt.% NaCl solution. The amount of the porosity of the coating was measured by electrochemical method. It was found that the sealing treatments by immersion in cerium bath successfully sealed the pores of the MAO coatings. The results of the corrosion tests showed that the MAO coating which was sealed in Ce bath for 10 min enhanced the corrosion resistance of the substrate significantly. Fur-thermore, this coating had the lowest amount of the porosity among the coatings.) 关键词：AZ91D镁合金密封处理微弧氧化膜氧化物涂层扫描电子显微镜稀土多孔电化学阻抗谱

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Investigation of rare earth sealing of porous micro-arc oxidation coating formed on AZ91D magnesium alloy

参考文献(32)

引证文献(20)

耦合文献(28)

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