2008•Journal of Central South University(Science and Technology)Requires access

Influence of pre-deformation on exfoliation corrosion behavior of Al-Cu-Li-Zr alloy containing Sc

Pan Qing-lin, Yunchun Li, Wenjie Liang, Zhou Ying-chun, LU Cong-ge, Xiaoyan Liu

Abstract

Exfoliation corrosion behavior of Al-3.5Cu-1.5Li-0.22(Sc+Zr) alloy under various treatment conditions was investigated by exfoliation corrosion tests and electrochemical impedance spectroscopy (EIS) tests. The results show that the exfoliation corrosion process is accelerated with the increase of aging time at 160 , ℃ the exfoliation corrosion susceptibility of the alloy from high to low is as follows: over-aged alloy→peak-aged alloy→under-aged alloy. The introduction of pre-deformation has no influence on the sequence of EXCO process. As the main corrosion-caused factors of the alloy are T1 phase and PFZ, pre-deformation accelerates the nucleation and growth of T1, and PFZ also broadens. Compared with T6 alloy, T8 alloy suffers from faster exfoliation corrosion.

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Key concepts: Alloy, Materials science, Corrosion, Exfoliation joint, Metallurgy, 6111 aluminium alloy, Nucleation, Deformation (meteorology)