Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 18    No. 2    April 2008

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Environmental friendly plasma electrolytic oxidation of AM60 magnesium alloy and its corrosion resistance
CAO Fa-he(曹发和)1, LIN Long-yong(林龙勇)2, ZHANG Zhao(张 昭)1,ZHANG Jian-qing(张鉴清)1, 3, CAO Chu-nan(曹楚南)1, 3

1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China;2. Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China;3. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, The Chinese Academy of Sciences, Shenyang 110016, China

Abstract:Plasma electrolytic oxidation of Mg-based AM60 alloys was investigated using 50 Hz AC anodizing technique in an alkaline borate solution, which contained a new kind of organic. The anodic film is relatively smooth with some micro pores and cracks, while the anodic film consists of MgO, MgAl2O4 and MgSiO3. The electrochemical behavior of anodic film was studied by electrochemical impedance spectroscopy and potentiodynamic polarization. Polarization results indicate the PEO treatment can decrease corrosion current by 3−4 magnitude compared with blank AM60 alloy. The anodic film presents a good level of corrosion protection for AM60 magnesium alloy, over 272 h of the salt spray test based on ASTM B117. The effect of micro-structure and composition on corrosion protection efficiency was also investigated.


Key words: AM60; plasma electrolytic oxidation; AC technique; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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