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Study on Intergranular Corrosion and Exfoliation Corrosion Behaviors of 2195 Al-Li Alloy

Lijun Yu

Abstract

The intergranular corrosion and exfoliation corrosion behaviors of 2195 Al-Li alloy were investigated. The simulated precipitates of θ′(Al 2Cu) and T1(Al 2CuLi) were fabricated, and their open-circuit potentials were measured. The influence of aging treatment on integranular corrosion and exfoliation corrosion was analyzed through the electrochemical behavior of these aging precipitates. It is sugges- ted that intergranular corrosion and exfoliation be caused by the anodic dissolution of T1 phase or the alternant corrosion of T1 and precipitate-free zone (PFZ). T1 phase is augmented and PFZ at grain boundary is broadened with aging time, and the susceptibility to intergranular corrosion and exfoliation is increased.

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Key concepts: Intergranular corrosion, Materials science, Corrosion, Metallurgy, Grain boundary, Alloy, Exfoliation joint, Dissolution