Study on the mechanism of grain size and residual stress coupling distribution on the intergranular corrosion susceptibility of AZ31B magnesium alloy

Abstract

intragranular microcracks, highlighting the pronounced initiation of corrosion cavities. In areas with residual compressive stress (fine grain regions), the corrosion reaction rate at the grain boundaries decreased, and the initiation of corrosion cavities was delayed or slowed down, resulting in a more uniform corrosion surface. The coupling effect of grain size and residual stress exhibited an inhibitory effect on the initiation of corrosion cavities and corrosion susceptibility at the grain boundaries. Overall, this paper provides an important reference for further understanding and controlling the corrosion resistance of AZ31B magnesium alloy.

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