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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 4    August 2005

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Electrochemical performance of microarc oxidation films formed on AZ91D alloy in two group electrolytes
WANG Li-shi(王立世), CAI Qi-zhou(蔡启舟) , 
WEI Bo-kang(魏伯康), LIU Quan-xin(刘全心)

State Key Laboratory of Die and Mould Technology, 
Huazhong University of Science and Technology, Wuhan 430074, China

Abstract: The phase composition and electrochemical performances of microarc oxidation(MAO) films prepared on AZ91D alloy by using step-down current method in a phosphate electrolyte(P-film) and silicate electrolyte(Si-film) were studied. The results show that P-film is mainly composed of Mg, MgAl2O4 and MgO,  and Si-film is composed of Mg2SiO4 and MgO. There clearly exists a fluoride-enriched zone with the thickness of about 1-2μm for P-film and 0.7-1μm for Si-film at the MAO coating/substrate interface. The electrochemical tests show that both P-film and Si-film can enhance the corrosion resistance of AZ91D magnesium alloy significantly. The corrosion failure process of the two films in 5%(mass fraction) NaCl solution is quite different.

 

Key words: AZ91D alloy; electrolyte; microarc oxidation; electrochemical performance 

ISSN 1672-7029
CN 43-1423/U

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