Microstructure and corrosion resistance of directionally solidified Mg-2 wt.% Zn alloy

被引：40
|
作者：
Jia, Hongmin [1 ]
Feng, Xiaohui [1 ]
Yang, Yuansheng [1 ,2 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, 72 Wenhua Rd, Shenyang 110016, Peoples R China
[2] Shandong Key Lab High Strength Lightweight Metall, Jinan 250014, Peoples R China
来源：
CORROSION SCIENCE | 2017年 / 120卷
关键词：
Directional solidification; Mg-2Zn alloy; Microstructure evolution; Corrosion resistance; MAGNESIUM ALLOY; AL ALLOYS; BEHAVIOR; MICROSEGREGATION; PHASES; CAST; AZ31;
D O I：
10.1016/j.corsci.2017.02.023
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructure and corrosion resistance of directionally solidified Mg-2 wt.% Zn alloy with different growth rates were investigated. Optical microscopy observations showed that the microstructure of directionally solidified Mg-2Zn alloy transformed from coarse cellular to fine cellular, undeveloped dendritic and finally dendritic structures as the growth rate increased from 20 mu m/s to 60 mu m/s, 120 mu m/s and 200 mu m/s, respectively. The results of electrochemical measurement and immersion test in 0.9 wt.% NaCl solution revealed that the corrosion resistance of directionally solidified Mg-2Zn alloy strongly depends on the microstructure. The samples with fine cellular structure have the highest corrosion resistance, which mainly due to the reduction of susceptible grain boundaries and homogenous distribution of Zn element. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：75 / 81
页数：7
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