Electrochemical performance of microarc oxidation films formed on AZ91D alloy in two group electrolytes

被引：0

作者：

Wang, LS ^{[1
]}

Cai, QZ ^{[1
]}

Wei, BK ^{[1
]}

Liu, QX ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Die & Mould Technol, Wuhan 430074, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2005年 / 15卷 / 04期

关键词：

AZ91D alloy; electrolyte; microarc oxidation; electrochemical performance;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

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 - 2 mu m for P-film and 0.7 - 1 mu m 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.

引用

页码：777 / 783

页数：7

共 16 条

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