Thickness effects on corrosion and wear resistance properties of micro-arc discharge oxide coatings on AZ91D magnesium alloys  

作　　者：黄伟九 刘明 李兆峰 曾荣昌 

机构地区：[1]School of Materials Science and Engineering,Chongqing Institute of Technology,Chongqing 400050,China

出　　处：《中国有色金属学会会刊：英文版》2006年第A03期1827-1830,共4页Transactions of Nonferrous Metals Society of China

基　　金：Project(2005BB4079) supported by the Chongqing Natural Science Foundation, China

摘　　要：The microarc oxidation coatings with difference thickness were synthesized on AZ91D magnesium alloy. The microstructure and phase structure of the coatings were analyzed using SEM and XRD, the tribological properties and corrosion resistance behaviour of the coatings were also investigated. The results show that the coating contains two layers, a porous outer layer and relatively dense inner layer. The microhardness of the MAO coatings is four to six times higher than that of the magnesium alloy substrate. The MAO coatings have much better wear-resistance and corrosion resistance abilities than those of magnesium alloy substrate, but possess higher friction coefficient. The results further indicate that there is an optimization thickness for corrosion and wear resistance.The microarc oxidation coatings with difference thickness were synthesized on AZ91D magnesium alloy. The microstructure and phase structure of the coatings were analyzed using SEM and XRD, the tribological properties and corrosion resistance behaviour of the coatings were also investigated. The results show that the coating contains two layers, a porous outer layer and relatively dense inner layer. The microhardness of the MAO coatings is four to six times higher than that of the magnesium alloy substrate. The MAO coatings have much better wear-resistance and corrosion resistance abilities than those of magnesium alloy substrate, but possess higher friction coefficient. The results further indicate that there is an optimization thickness for corrosion and wear resistance.

关 键 词：厚度 金属腐蚀 磨损行为 陶瓷涂层 镁合金 氧化行为 

分 类 号：TG172[金属学及工艺—金属表面处理]