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Effect of Mg12Nd and Mg3Nd On the Corrosion Behavior of Mg‒3 wt%Nd Alloy in Saline Solution
Kaihua Yuan,Jianfeng Wang,Yufeng Sun,Shijie Zhu,Hairong Liu,Shaokang Guan 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.5
In this paper, the precipitates of the Mg‒3 wt%Nd alloy in the as-cast state and after heat treatment at 540 ℃ for 12 h wereinvestigated and related to the corrosion behavior in saline solution. For the as-cast specimen, the network and sphericalβ-phases (Mg12Nd) act as the anodes relative to Mg matrix at the initial stage of immersion in saline solution. Withincreasing the immersion time, the intergranular corrosion caused by the preferential dissolution of the reticular β-phaseleads to the detachment of Mg fragments. For the heat-treated specimen, the plate-shaped β1-phases (Mg3Nd) distributedevenly in the grain interior act as the micro-cathodes. The corrosion pits are prone to extend horizontally and connectedeach other, resulting in an uniform corrosion status and a relatively lower corrosion rate. This result is helpful for developingthe biomedical Mg‒Nd base alloys with a good degradation property by adjusting the precipitation of intermetallics.