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An Investigation of the Role of Calcium in the Microstructure of Mg-5Al-4Sn-Based Alloys and Pitting Corrosion Resistance

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Abstract

In this work, the impact of alloying calcium into Mg-5Al-4Sn-based alloys on the microstructure and pitting corrosion resistance of these alloys is characterized. Electrochemical results showed that the corrosion potential (Ecorr), pitting potential (Epit), film stability, and film and charge transfer resistances of the investigated specimens increased when the calcium content in the alloys was increased up to 1.0 wt.%. Surface characterizations showed that the addition of calcium fosters the formation of a passive film, which contains a mixture of oxides/hydroxides of aluminum, magnesium, and tin that are uniformly distributed on the alloy surface. Notably, calcium addition also promotes grain refinement, and a more uniform distribution of the secondary phases in the alloy structure, boosting passive film formation on the alloy surfaces. These benefits could foster greater pitting resistance in the Mg-5Al-4Sn-based alloy system.

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Acknowledgments

This work is funded by PetroVietnam University under grant code GV2007.

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Correspondence to Casen Panaitescu or Nam Nguyen Dang.

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Anh, N.P., Bach, L.X., Panaitescu, C. et al. An Investigation of the Role of Calcium in the Microstructure of Mg-5Al-4Sn-Based Alloys and Pitting Corrosion Resistance. J. of Materi Eng and Perform 31, 8830–8839 (2022). https://doi.org/10.1007/s11665-022-06910-5

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