Behavior of localized corrosion of Al-Zn-Mg-Cu alloys in relation with their Zn and Mg contents

被引：0

作者：

Xie J. ^{[1
]}

Meng L.-C. ^{[2
]}

Chen J.-H. ^{[1
]}

Yang X.-B. ^{[1
]}

Liu J.-Z. ^{[1
]}

Liu C.-H. ^{[1
]}

机构：

[1] College of Materials Science and Engineering, Hunan University, Changsha

[2] CSR Qingdao Sifang Locomotive and Rolling Stock Co., Ltd., Qingdao

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2017年 / 27卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Al-Zn-Mg-Cu alloys; Constituent; Localized corrosion; Microstructure; Precipitate free zone;

D O I：

10.19476/j.ysxb.1004.0609.2017.12.10

中图分类号：

学科分类号：

摘要：

It has generally been believed that the Cu addition in Al-Zn-Mg-Cu alloys can improve the stress corrosion resistance of the alloys. Nonetheless, for such alloys with a high Cu-content, few papers have paid attention to their exfoliation corrosion (EXCO) and intergranular corrosion (IGC) (two kinds of localized corrosion) resistance in relation with their Zn and Mg contents. In the present study, peak-aged Al-Zn-Mg-Cu alloys with relatively high Cu contents (2.0%-2.5%) were studied for their localized corrosion behaviors with varying Zn and Mg contents. By scanning/transmission electron microscopy (S/TEM), the microstructures of the alloys were characterized in relation with their properties of corrosion resistance. The alloys were classified into two groups: one with higher Mg content (high-Mg group) and another with lower Mg content (low-Mg group). The results show the following: 1) For both the two groups of alloys, with decreasing the Zn-content, their localized corrosion resistance decreases without exception; 2) The high-Mg group of alloys are worse than the low-Mg group of alloys in IGC resistance in their initial stages of corrosion, but better in their late stages; 3) For EXCO resistance, the former group is better than the late group in their early-stages of corrosion, but worse in their late stages of in-depth corrosion. © 2017, Science Press. All right reserved.

引用

页码：2473 / 2482

页数：9

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