Effect of Zn/Mg ratios on SCC, electrochemical corrosion properties and microstructure of Al-Zn-Mg alloy

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作   者：

Chen, Songyi;  Li, Jiyu;  Hu, Gui-yun;  Chen, Kanghua;  Huang, Lanping; 

作者机构：

Peoples R China;  Hunan;  Changsha 410083;  Collaborat Innovat Ctr Adv Nonferrous Struct Mat;  Light Alloy Res Inst;  Cent S Univ; 

关键词：

Zn/Mg ratio;  Al-Zn-Mg alloy;  Microstructure;  Corrosion properties; 

期刊名称：

Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics

i s s n：

0925-8388

年卷期：

2018 年 757 卷

页   码：

259-264

页   码：

摘   要：

A detailed investigations of Zn/Mg ratios on stress corrosion cracking(SCC), electrochemical corrosion properties and precipitates of Al-Zn-Mg alloy with Zn+Mg 7 wt% were studied by mechanical, stress corrosion cracking(SCC), electrochemical cyclic polarization together with transmission electron microscopy (TEM) microstructural examinations. It is shown that the strength, SCC and electrochemical corrosion resistance are significantly increased with the decrease of Zn/Mg ratio. The strength of the alloys are significantly increases with the decrease of Zn/Mg ratio, which was attributed to increase the volume fraction of matrix precipitates. The enhance of SCC resistance and electrochemical corrosion properties was attributed to the narrower width of FEZ and low concentration of Zn in aluminum matrix. (C) 2018 Elsevier B.V. All rights reserved.