Pan-pan Wang, Hai-tao Jiang, Yu-jiao Wang, Yun Zhang, Shi-wei Tian, Ye-fei Zhang, and Zhi-ming Cao, Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg-3Al-1Zn alloy, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-021-2268-4
Cite this article as:
Pan-pan Wang, Hai-tao Jiang, Yu-jiao Wang, Yun Zhang, Shi-wei Tian, Ye-fei Zhang, and Zhi-ming Cao, Role of trace additions of Ca and Sn in improving the corrosion resistance of Mg-3Al-1Zn alloy, Int. J. Miner. Metall. Mater. https://doi.org/10.1007/s12613-021-2268-4
Research Article

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

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  • Received: 9 December 2020Revised: 9 February 2021Accepted: 17 February 2021Available online: 18 February 2021
  • 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-Zn (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, 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 exihited 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.
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