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

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 20    No. 11    November 2010

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Corrosion resistance of micro-arc oxidized ceramic coating on
cast hypereutectic alloy
GUO Qiao-qin(郭巧琴)1, 2, JIANG Bai-ling(蒋百灵)1, LI Jian-ping(李建平)2,
LI Gao-hong(李高宏)2, XIA Feng(夏 峰)2

1. Institute of Materials Science and Technology, Xi’an University of Technology, Xi’an 710048, China;
2. School of Materials and Chemical Engineering, Xi’an Technological University, Xi’an 710032, China

Abstract:The corrosion resistance of the micro-arc oxidation (MAO) ceramic coating on a cast Al-13Si-5Cu alloy was investigated using various electrochemical methods including electrochemical impedance spectroscopy (EIS) and polarization curves. Microstructures of MAO ceramic coating were studied by SEM, and the influence of microscopic patterns on corrosion resistance was analyzed. The corrosion resistance of the aluminum alloy can be improved significantly by MAO process owing to increasing impedance and corrosion potential and decreasing corrosion current, and the ceramic coatings are composed of loose layer, compact layer and transition layer, which improve the corrosion resistance. The corrosin resistance is determined by the thickness of the compact layer and is not proportional to the total thickness of MAO, though the latter is one of the important factors influencing the corrosin resistance.

 

Key words: micro-arc oxidation(MAO); Al-13Si-5Cu aluminium alloy; EIS; polarization; corrosion resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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