Corrosion of friction stir welded joints of the 2219-T8 Al alloy in acidic solutions

被引：0
|
作者：
Kang J. [1 ,2 ]
Liang S. [3 ]
Wu A. [1 ]
Wang G. [4 ]
机构：
[1] State Key Laboratory of Tribology, Department of Mechanical Engineering, Tsinghua University, Beijing
[2] State Grid Jibei Electric Power Co. Ltd., Research Institute, North China Electric Power Research Institute Co., Ltd., Beijing
[3] Shougang Institute of Technology, Beijing
[4] China Academy of Launch Vehicle Technology, Beijing
来源：
Wu, Aiping (wuaip@tsinghua.edu.cn) | 1600年 / Tsinghua University卷 / 57期
关键词：
2219 Al alloy; Acidic solution; Corrosion; Friction stir welding; Heat-affected zone;
D O I：
10.16511/j.cnki.qhdxxb.2017.22.022
中图分类号：
学科分类号：
摘要：
Al alloy (AA) 2219 has potential for use in liquid cryogenic rocket fuel tanks, with friction stir welding (FSW) as a suitable welding method. However, there is limited data on the corrosion of FSW AA2219-T8 joints in acidic solutions. Therefore, the corrosion of an FSW AA2219-T8 joint in an acidic chloride solution (pH 2, 0.5 mol/L NaCl) was characterized using potentiodynamic polarization and corrosion immersion tests. An optical profilometer was used to analyze the corrosion morphology, depth and density of the corroded cross-section surface and identify the corrosion mechanism. The results show that the corrosion resistance differs throughout the whole heat-affected zone (HAZ) with the worst corrosion region far from the welding seam. The corrosion resistance significantly increases in the thermomechanically affected zone (TMAZ) and the weld nugget zone (WNZ). The WNZ, TMAZ and near seam regions of HAZ are less affected because they are cathodes to other regions and are protected from corrosion. Unlike in neutral solutions, the primary reduction reaction is hydrogen evolution, which reduces the corrosion potential and pitting potential in each region. © 2017, Tsinghua University Press. All right reserved.
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页码：465 / 470
页数：5
相关论文
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