Corrosion behaviour induced by crystal structure transformation of Mg alloy with AlTiB

Abstract

The microstructural evolution and corrosion behaviour of three kinds of Mg alloy containing AlTiB (α, α + , ) were investigated. The result showed that changing Li content can transform the matrix of Mg alloy from α-Mg to -Li. Except for -Li, the microstructural morphology of α-Mg is refined by TiB₂, In the study of corrosion behaviour, a structure of multiple layers is formed on corrosion surfaces, and the α +  alloy has a poor corrosion resistance which results from a mechanism of the dynamic galvanic couple between α-Mg and -Li. However, the -Li alloy with high Li content has relatively good corrosion resistance.

KEYWORDS:

• Mg alloy
• microstructure
• corrosion

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The authors gratefully acknowledge financial support from the Youth Cultivation Program of Liaoning Provincial Education Department [grant number JYT2020111], Liaoning Revitalization Talents Program [grant number XLYC2007075] and the National Natural Science Foundation of China [grant number 51701128].