Corrosion properties of glassy Mg70Al15Ga15 in 0.1 M NaCl solution

被引：18
|
作者：
Uhlenhaut, D. I. [1 ]
Furrer, A. [1 ]
Uggowitzer, P. J. [1 ]
Loeffler, J. F. [1 ]
机构：
[1] ETH, Lab Met Phys & Technol, Dept Mat, CH-8093 Zurich, Switzerland
来源：
INTERMETALLICS | 2009年 / 17卷 / 10期
关键词：
Glasses; metallic; Rapid solidification processing; Corrosion; Surface properties; Electrochemical characterization; MELT-SPUN MG; AMORPHOUS-ALLOYS; METALLIC GLASSES; MAGNESIUM ALLOYS; STAINLESS-STEELS; BEHAVIOR; PASSIVITY; ALUMINUM; STABILITY; CHLORIDE;
D O I：
10.1016/j.intermet.2009.03.009
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The corrosion behavior of glassy Mg70Al15Ga15 was investigated in 0.1 M NaCl solutions of various pH values. Potentiodynamic polarization measurements confirm a pronounced passivity for 4 <= pH <= 12. Corrosion currents in neutral solutions are found to be as low as 10(-6) A/cm(2). Optical microscopy and Auger electron spectroscopy were performed on samples immersed under open-circuit conditions in neutral, acidic and alkaline 0.1 M NaCl solutions to observe their time-dependent passive film formation. A significant incorporation of aluminum in the surface layers was found. The alloys show an unusual stability against dissolution in chloride-containing solutions, raising expectations of a highly corrosion-resistant Mg-based alloy. The time-dependent limitations of this stability are discussed in context with the surface films observed. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：811 / 817
页数：7
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