Formation and breakdown of surface films on magnesium and its alloys in aqueous solutions

被引：181

作者：

Hara, Nobuyoshi ^{[1
]}

Kobayashi, Yasuhiro

Kagaya, Daisuke

Akao, Noboru

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Mat Sci, Sendai, Miyagi 9808579, Japan

[2] Tohoku Univ, Sch Engn, Sendai, Miyagi 9808579, Japan

来源：

CORROSION SCIENCE | 2007年 / 49卷 / 01期

关键词：

magnesium; Mg alloys; ellipsometry; oxidation films; film thickness;

D O I：

10.1016/j.corsci.2006.05.033

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

The influences of surface films formed by open-circuit exposure to neutral solutions on the corrosion and electrochemical behaviour of pure Mg and Mg alloys have been examined by in situ ellipsometric analysis and electrochemical measurements. Surface films mainly composed of Mg(OH)2 grew rapidly during open-circuit exposure to 0.1 M NaCl and 0.1 M Na2SO4 solutions. These films had protective ability to passivate Mg in the solutions. However, they suffered local breakdown under anodic polarisation. The passive current density decreased and the breakdown potential increased with increasing immersion time and film thickness. Influences of purity and alloying elements on the passivity and its breakdown of Mg have been discussed. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：166 / 175

页数：10

共 15 条

[1]

The oxidation kinetics of Mg and Al surfaces studied by AES and XPS [J].