Electrochemical performance of microarc oxidation films formed on AZ91D magnesium alloy in silicate and phosphate electrolytes

被引：183

作者：

Cai, QZ ^{[1
]}

Wang, LS ^{[1
]}

Wei, BK ^{[1
]}

Liu, QX ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Plast Forming Simulat & Dies Mould, Wuhan 430074, Peoples R China

来源：

SURFACE & COATINGS TECHNOLOGY | 2006年 / 200卷 / 12-13期

关键词：

AZ91D magnesium alloy; microarc oxidation; phosphate; silicate; potentiodynamic polarization; electrochemical impedance spectroscopy;

D O I：

10.1016/j.surfcoat.2005.05.039

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This paper reports on studies of the phase composition and electrochemical performances of microarc oxidation (MAO) films formed on AZ91D alloy using step-down current method in phosphate electrolytes (P-film) and silicate electrolytes (Si-film). The results showed that the P-film was mainly composed of Mg, MgAl2O4, MgO and the Si-film was composed of Mg2SiO4, MgO. There clearly existed a fluoride-enriched zone of about 1 similar to 2 mu m for P-film and 0.7 similar to 1 mu m for Si-film at the MAO coating/substrate interface. The electrochemical tests showed that both P-film and Si-film could enhance the corrosion resistance of AZ91D magnesium alloy significantly; the corrosion failure processes of the two films in 5 wt.% NaCl solution were quite different. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：3727 / 3733

页数：7

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