期刊
CORROSION SCIENCE
卷 180, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2020.109174
关键词
Micro-galvanic corrosion; Intermetallic particles; Strain localization; Volta potential; Elastic deformation; Plastic deformation
资金
- National Key Research and Development Program of China [2017YFB0702300]
- National Natural Science Foundation of China [51671029]
- Fundamental Research Fund for the Central University [FRF-TP-19-003132]
- Leading Talent Engineering Project for Taishan Industry
The research found that in the AA7075-T6 alloy, there were slight changes in the potential differences between the particles in the elastic deformation stage, while the changes were more significant in the plastic deformation stage, thereby affecting the pitting corrosion resistance of the aluminum alloy.
Micro-galvanic corrosion behaviors between two primary intermetallic particles (Mg2Si, alpha(Al-Fe-Cu)) and the Al matrix were investigated under elastic and plastic deformations in AA7075-T6. Strain localization was mainly concentrated within Mg2Si and at the interface of alpha(Al-Fe-Cu)/Al matrix under deformations. The experimental Volta potential differences between Mg2Si, alpha(Al-Fe-Cu) and Al decreased by 0-16 mV and 2-27 mV in the elastic stage but increased by 0-39 mV and 0-81 mV in the plastic stage, which were consistent with the calculation results. Accordingly, the pitting corrosion resistance was improved under elastic deformation but deteriorated under plastic deformation.
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