Effect of microstructure for AM60 magnesium alloy cast into copper mold on electrochemical characteristics

被引：2

作者：

Furui M. ^{[1
]}

Saitou S. ^{[2
]}

Sunada S. ^{[1
]}

Ikeno S. ^{[1
]}

Saikawa S. ^{[3
]}

机构：

[1] Graduate School of Science and Engineering for Research, University of Toyama, 3190 Gofuku, Toyama-shi

[2] Department of Material Systems Engineering and Life Science, Faculty of Engineering, University of Toyama, Toyama-shi, Toyama

[3] Ahresty Corporation, Toyohashi-shi, Aichi

来源：

Keikinzoku/Journal of Japan Institute of Light Metals | 2010年 / 60卷 / 12期

关键词：

AM60 magnesium alloy; Electrochemical impedance spectroscopy; Microstructure; Polarization curve;

D O I：

10.2464/jilm.60.629

中图分类号：

学科分类号：

摘要：

Magnesium alloys are remarkably corroded in chloride environments. The fundamental corrosion behavior of AM60 magnesium alloy cast into copper mold was investigated through a polarization test and electrochemical impedance spectroscopy. Metallographic characteristics were evaluated by optical microscopy using the sample in the conditions of as cast, as solution-treated and as aged. The solution-treated sample showed an excellent corrosion resistance because of its homogeneous microstructure. The other samples have poor corrosion resistance compared with the solution-treated sample. Cross sectional observation of the sample corroded under the constant quantity of electric charge revealed that inhomogeneity of microstructure advanced active dissolution of the pit bottom. The electrochemical characteristics for AM60 magnesium alloy related closely to their microstructure.

引用

页码：629 / 634

页数：5

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