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《Rare Metal Materials and Engineering》 2007-S1
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The Ceramic Coatings on AZ91D Magnesium Alloy Formed by PEO and Their Film Microstructure and Corrosion Resistance

Wang Shen,Pan Wei,Li Xinming,Su Yongzhong(School of Materials Science and Engineering,Beijing Institute of Technology,Beijing 100081,China)(Tsinghua University,Beijing 100084,China)(Tarim University,Urumchi 84330,China)  
The growth process,microstructure,and phase composition of the ceramic coatings by plasma electrolytic oxidation process(PEO) on AZ91D magnesium alloy were investigated by SEM and XRD,the growth mechanism of the coating formed was also studied.The corrosion resistance of the coating sample were compared with uncoated sample by salt spray test.The results show that the oxide coating formed by PEO,which consist of three layers:the outer layer is porous,the inner layer is with compact structure and the transitional layer conjoins strongly to the substrate.During PEO process,negative oxygen ions and magnesium ion permeate and transfer to the depth of the coating by discharge path,due to the plasma environment at high temperature and pressure and blind holes are formed,which can improve the density of the coating and the toughness of magnesium alloy substrate.
【CateGory Index】: TG174.453
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