High-temperature oxidation of Mg–Ca alloy: Experimentation and density functional theory

Oxidation resistance of Mg alloys with different amounts of Ca were examined. The oxidation resistance of Mg at 515 °C was significantly improved by alloying with Ca, and Mg alloyed with 1.0 wt% Ca demonstrated the best oxidation resistance. Based on these observations, combined with Gibbs free ener...

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Veröffentlicht in:Corrosion science 2022-03, Vol.196, p.110046, Article 110046
Hauptverfasser: Ming, Yue, You, Guoqiang, Yao, Fanjin, Zeng, Sheng, Zhang, Jun, Zhao, Jianhua, Zeng, Wen
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Sprache:eng
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Zusammenfassung:Oxidation resistance of Mg alloys with different amounts of Ca were examined. The oxidation resistance of Mg at 515 °C was significantly improved by alloying with Ca, and Mg alloyed with 1.0 wt% Ca demonstrated the best oxidation resistance. Based on these observations, combined with Gibbs free energy and density functional theory calculations, α-Mg and Mg2Ca oxidation models describing the oxidation process are proposed. Oxide films formed on α-Mg are effective at improving the oxidation resistance, whereas those formed on Mg2Ca are unstable, and tend to peel off from the substrate, resulting in further oxidation. •The oxidation process was calculated and simulated.•The oxidation on α-Mg and Mg2Ca was observed and analysed.•The oxidation models on α-Mg and Mg2Ca were proposed.•The oxidation effect of α-Mg and Mg2Ca was analysed.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2021.110046