1. Effect of substrate orientations on the electrochemical and localized corrosion behavior of a quad-layer Al alloy composite.
- Author
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Wang, Mingyang, Ji, Yuanyuan, Xia, Da-Hai, Zhou, Dejing, Zhu, Yesen, Gao, Zhiming, Qin, Zhenbo, and Hu, Wenbin
- Subjects
ALLOYS ,CORROSION resistance ,IMPEDANCE spectroscopy ,ELECTROLYTIC corrosion ,ANODES - Abstract
• Electrochemical and localized corrosion behavior of a 4045/7072/3003 M/4045 Al alloy composite in NaCl solution was investigated. • Plane directions showed higher corrosion resistance than the cross-sectional surface. • The cross-section showed a complex galvanic effect among the four layers, and the galvanic coupling between 4045/7072 accelerated the dissolution of 4045. Electrochemical and localized corrosion behavior of a 4045/7072/3003 M/4045 Al alloy composite in 3.5 wt.% NaCl solution was investigated from cross-sectional and plane directions by electrochemical impedance spectroscopy, polarization curves, and high-resolution microscopic examination. Plane directions showed higher corrosion resistance than the cross-sectional surface, with almost all localized corrosion initiated from Si-containing inclusions. The cross-section showed a complex galvanic effect among the four layers, the galvanic coupling between 4045/7072 accelerated the dissolution of 7072 because 7072 served as the anode, however, the galvanic coupling between 3003 M/4045 protected 4045 from corrosion, indicating that 3003 M served as the anode. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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