Corrosion behavior of the friction-stir-welded joints of 2A14-T6 aluminum alloy

被引：38
作者：
Qin, Hai-long [1 ]
Zhang, Hua [2 ]
Sun, Da-tong [3 ]
Zhuang, Qian-yu [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, Beijing 100083, Peoples R China
[2] Welding Inst, Cambridge CB21 6AL, England
[3] Chongqing Changan Automobile Co Ltd, Chongqing 400023, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2015年 / 22卷 / 06期
基金：
中国国家自然科学基金;
关键词：
aluminum alloys; friction stir welding; joints; corrosion; in-situ observation; MICRO-ARC OXIDATION; PITTING CORROSION; WELDING JOINT; MICROSTRUCTURE; RESISTANCE; SUSCEPTIBILITY; 2024-T3; STRESS; LASER; MICROHARDNESS;
D O I：
10.1007/s12613-015-1116-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The corrosion behavior of friction-stir-welded 2A14-T6 aluminum alloy was investigated by immersion testing in immersion exfoliation corrosion (EXCO) solution. Electrochemical measurements (open circuit potential, potentiodynamic polarization curves, and electrochemical impedance spectroscopy), scanning electron microscopy, and energy dispersive spectroscopy were employed for analyzing the corrosion mechanism. The results show that, compared to the base material, the corrosion resistance of the friction-stir welds is greatly improved, and the weld nugget has the highest corrosion resistance. The pitting susceptibility originates from the edge of Al-Cu-Fe-Mn-Si phase particles as the cathode compared to the matrix due to their high self-corrosion potential. No corrosion activity is observed around the theta phase (Al2Cu) after 2 h of immersion in EXCO solution.
引用
收藏
页码：627 / 638
页数：12
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