Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg–3Al–1Zn alloy

Panpan Wang; Haitao Jiang; Yujiao Wang; Yun Zhang; Shiwei Tian; Yefei Zhang; Zhiming Cao

doi:10.1007/s12613-021-2268-4

Volume 29 Issue 8

Aug. 2022

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2022 > 29(8): 1559-1569

Panpan Wang, Haitao Jiang, Yujiao Wang, Yun Zhang, Shiwei Tian, Yefei Zhang, and Zhiming Cao, Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg–3Al–1Zn alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1559-1569. https://doi.org/10.1007/s12613-021-2268-4

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Panpan Wang, Haitao Jiang, Yujiao Wang, Yun Zhang, Shiwei Tian, Yefei Zhang, and Zhiming Cao, Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg–3Al–1Zn alloy, Int. J. Miner. Metall. Mater., 29(2022), No. 8, pp. 1559-1569. https://doi.org/10.1007/s12613-021-2268-4

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Research Article

Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg–3Al–1Zn alloy

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Corresponding author:
Haitao Jiang E-mail: jianght@ustb.edu.cn
Received: 9 December 2020; Revised: 9 February 2021; Accepted: 17 February 2021; Available online: 18 February 2021

Abstract

Abstract

The limited wide applicability of commercial Mg alloys is mainly attributed to the poor corrosion resistance. Addition of alloying elements is the simplest and effective method to improve the corrosion properties. Based on the low-cost alloy composition design, the corrosion behavior of commercial Mg–3Al–1Zn (AZ31) alloy bearing minor Ca or Sn element was characterized by scanning Kelvin probe force microscopy, hydrogen evolution, electrochemical measurements, and corrosion morphology analysis. Results revealed that the potential difference of Al₂Ca/α-Mg and Mg₂Sn/α-Mg was (230 ± 19) mV and (80 ± 6) mV, respectively, much lower than that of Al₈Mn₅/α-Mg (430 ± 31) mV in AZ31 alloy, which illustrated that AZ31–0.2Sn alloy performed the best corrosion resistance, followed by AZ31–0.2Ca, while AZ31 alloy exhibited the worst corrosion resistance. Moreover, Sn dissolved into matrix obviously increased the potential of α-Mg and participated in the formation of dense SnO₂ film at the interface of matrix, while Ca element was enriched in the corrosion product layer, resulting in the corrosion product layer of AZ31–0.2Ca/Sn alloys more compact, stable, and protective than AZ31 alloy. Therefore, AZ31 alloy bearing 0.2wt% Ca or Sn element exhibited excellent balanced properties, which is potential to be applied in commercial more comprehensively.
- AZ31 Mg alloy;
- micro-galvanic corrosion;
- alloying addition;
- Volta potential;
- precipitates

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