Corrosion behavior of Cu-containing AZ31 magnesium alloy

被引：0
|
作者：
Zhou M. [1 ,2 ,3 ]
Liu C.-M. [1 ,2 ]
Gao Y.-H. [1 ]
Xu S.-Y. [1 ]
Jiang S.-N. [1 ]
机构：
[1] School of Materials Science and Engineering, Central South University, Changsha
[2] Light Alloy Research Institute, Central South University, Changsha
[3] Key Laboratory of Nonferrous Materials Science and Engineering, Ministry of Education, Central South University, Changsha
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 01期
基金：
中国国家自然科学基金;
关键词：
AlCuMg phase; Anodic magnesium matrixe; AZ31-xCu alloy; Corrosion rate; Micro-galvanic cathode;
D O I：
10.19476/j.ysxb.1004.0609.2019.01.03
中图分类号：
学科分类号：
摘要：
The as-cast microstructure, phase composition and surface corrosion morphologies of AZ31-xCu(x=0, 0.5, 1.5, 3, mass fraction, %) alloys were observed by scanning electron microscope (SEM) equipped with energy dispersive spectroscope (EDS) and X-ray diffraction (XRD). The corrosion behavior of the alloys in 3.5% NaCl solution was investigated by immersion test and electrochemical test. The results indicate that the content of AlCuMg phase, main secondary phase in the Cu-containing alloys, is positively dependent on copper concentration. Acceleration of corrosion rate is found in Cu-containing alloys due to micro-galvanic corrosion. AlCuMg phase acts as micro-galvanic cathode against anodic magnesium matrixes. The corrosion rate of the alloy with Cu content of 3% is the fastest. The AZ31-3Cu alloy exhibits the maximum hydrogen evolution rate of 275 mL/(cm2∙d-1) and corrosion current density of 698 μA/cm2. © 2019, Science Press. All right reserved.
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页码：18 / 26
页数：8
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