Corrosion of hot extrusion AZ91 magnesium alloy: I-relation between the microstructure and corrosion behavior

被引：251
|
作者：
Zhang, Tao [1 ,2 ]
Shao, Yawei [1 ,2 ]
Meng, Guozhe [1 ,2 ]
Cui, Zhongyu [1 ]
Wang, Fuhui [1 ,2 ]
机构：
[1] Harbin Engn Univ, Corros & Protect Lab, Key Lab Superlight Mat & Surface Technol, Minist Educ, Harbin 150001, Peoples R China
[2] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China
来源：
CORROSION SCIENCE | 2011年 / 53卷 / 05期
基金：
中国国家自然科学基金;
关键词：
Magnesium; SEM; TEM; EIS; Anodic dissolution; PLASTIC-DEFORMATION; STEEL; CAST;
D O I：
10.1016/j.corsci.2011.02.015
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The effect of hot extrusion on the corrosion behavior of AZ91 magnesiun alloy was investigated by weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurements. The results showed that the extruded alloy had lower corrosion resistance compared to cast alloy. This observation has been explained from point of view of microstructure changes, wherein the increased density of dislocation, twins and grain boundary increased the anodic dissolution of AZ91 alloy and rearrangement of beta phase accelerated the rate of both the anodic and cathodic process. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1960 / 1968
页数：9
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