2018•Materials science forumRequires access

Influence of Sc Addition on the Corrosion Behavior of Medium Strength Al-Zn-Mg Alloy

Zhao Ming Li, Hai Chang Jiang, Yun Li Wang, Duo Zhang, De Sheng Yan, Li Rong

Abstract

In this paper, the effect of Sc addition (0.06 wt%) on the corrosion behavior of medium strength Al-Zn-Mg alloy is investigated by mass loss measurements, electrochemical experiment, intergranular corrosion and exfoliation corrosion tests. The results indicate the addition of Sc reduces the relative weight loss and enhances pitting performance as a result of grain refinement. The improved intergranular corrosion and exfoliation corrosion resistance caused by minor Sc addition are mainly attributed to the delay in both the initiation and advance stages of local corrosion.

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Key concepts: Materials science, Intergranular corrosion, Corrosion, Alloy, Metallurgy, Pitting corrosion, Exfoliation joint, Electrochemistry