Study on corrosion resistance of artificially aged 7075 aluminium alloy by using Cs-corrected STEM

被引：12
作者：
Liu, Fang [1 ,2 ]
Zheng, Jing-xu [2 ,3 ]
Chen, Xia [1 ]
Xu, Xue-song [2 ]
Chen, Bin [2 ]
机构：
[1] Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China
[3] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2022年 / 32卷 / 09期
关键词：
7075 aluminium alloy; artificial aging; Mg(Zn; Cu) (2) precipitate; intergranular corrosion; Cs-corrected; scanning transmission electron microscopy; MECHANICAL-PROPERTIES; DIFFERENT TEMPERS; MICROSTRUCTURE; BEHAVIOR; DEFORMATION; FRACTURE; CRACKING;
D O I：
10.1016/S1003-6326(22)65986-7
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
This research studied the mechanism of the corrosion resistance enhancement of artificially aged 7075 aluminium alloy using advanced Cs-corrected scanning transmission electron microscopy (STEM). The corrosion behaviors of artificially aged 7075 aluminium alloys in a 3.5 wt.% NaCl solution were investigated by impedance spectra, equivalent circuit analyses, polarization measurements and immersion tests. The results show that a longer aging treatment leads to better corrosion resistance, which can be attributed to the following microstructural features, as revealed by STEM. The Cu segregation at grain boundaries under over-aged conditions helps retard intergranular corrosion. The Mg(Zn,Cu) 2 precipitates formed on the surfaces of Al18Mg3(Cr,Mn) 2 dispersoids effectively insulate the dispersoids as cathodes in corrosion, from the Al matrix. This study demonstrates a potential strategy to design corrosion-resistant alloys achieved by proper alloying and subsequent aging.
引用
收藏
页码：2828 / 2837
页数：10
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