Friction stir processing of aluminium alloy AA7075: Microstructure, surface chemistry and corrosion resistance

被引：92
|
作者：
Pang, J. J. [1 ,2 ]
Liu, F. C. [3 ]
Liu, J. [4 ]
Tan, M. J. [5 ]
Blackwood, D. J. [1 ]
机构：
[1] Natl Univ Singapore, Dept Mat Sci & Engn, Block E3A,7 Engn Dr 1, Singapore 117574, Singapore
[2] Zhejiang Univ Water Resources & Elect Power, Sch Mech & Automot Engn, 583 Xuelin St,East Xiasha Higher Educ Pk, Hangzhou, Zhejiang, Peoples R China
[3] Osaka Univ, JWRI, 11-1 Mihigaoka, Osaka, Ibaraki 5670047, Japan
[4] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London SW7 2AZ, England
[5] Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore
来源：
CORROSION SCIENCE | 2016年 / 106卷
关键词：
Aluminium; Alloy; Polarization; EIS; Pitting corrosion; Segregation; LASER-SCANNING MICROSCOPY; MECHANICAL-PROPERTIES; LOCALIZED CORROSION; INTERMETALLIC PHASES; BEHAVIOR; PARTICLES; METROLOGY; AL7CU2FE; HEAT;
D O I：
10.1016/j.corsci.2016.02.006
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Friction stir process (FSP) was conducted in both air and water on aluminium alloy AA7075, with the latter environment providing the smallest grain size and a higher surface copper level. In 0.5 M NaCl solution, FSP conducted in air was beneficial, reducing the corrosion rate and increasing the pitting potential. When performed in water it was detrimental, having no influence on the pitting potential but increasing the corrosion rate, due to the higher surface area coverage of Cu rich regions increasing the area available for the cathodic reaction. For long-term exposure reduced corrosion rates were observed for both FSP-treated samples. (C) 2016 Elsevier Ltd. All rights reserved.
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页码：217 / 228
页数：12
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