Effects of Ultrasonic Surface Rolling on the Localized Corrosion Behavior of 7B50-T7751 Aluminum Alloy

被引：35
作者：
Xu, Xingchen [1 ]
Liu, Daoxin [1 ]
Zhang, Xiaohua [1 ]
Liu, Chengsong [1 ]
Liu, Dan [1 ]
Ma, Amin [1 ]
机构：
[1] Northwestern Polytech Univ, Corros & Protect Res Lab, Xian 710072, Peoples R China
来源：
MATERIALS | 2020年 / 13卷 / 03期
基金：
中国国家自然科学基金;
关键词：
aluminum alloy; pitting; compressive residual stress; nanocrystalline; ultrasonic surface rolling process; STAINLESS-STEEL; PASSIVITY DEGRADATION; MECHANICAL-PROPERTIES; METALLIC MATERIALS; FATIGUE BEHAVIORS; TI-6AL-4V ALLOY; AL-ALLOY; MICROSTRUCTURE; RESISTANCE; IMPEDANCE;
D O I：
10.3390/ma13030738
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effects of an ultrasonic surface rolling process (USRP) on the localized corrosion behavior of 7B50-T7751 aluminum alloy in a sodium chloride + hydrogen peroxide solution were investigated through microstructural observation, immersion testing, and electrochemical measurements. The results revealed that this alloy is prone to pitting. However, the localized corrosion resistance can be significantly improved via both one-pass USRP and 12-pass USRP treatment. Furthermore, in the test solution, the thickness and the acceptor density of the passivation film were affected by the USRP treatment. The improved corrosion resistance of one-pass USRP-treated samples resulted mainly from the introduced compressive residual stress. However, this stress played a secondary role in the considerable enhancement observed for the corrosion resistance of the 12-pass USRP-treated samples. This enhancement is attributed primarily to the nanocrystalline surface and homogeneous surface microstructure induced by the multiple-pass USRP treatment.
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页数：19
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