微量Ca和Sn对提高Mg–3Al–1Zn合金耐蚀性的作用

王盼盼; 江海涛; 王玉娇; 张韵; 田世伟; 张业飞; 曹志明

doi:10.1007/s12613-021-2268-4

Volume 29 Issue 8

Aug. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 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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研究论文

微量Ca和Sn对提高Mg–3Al–1Zn合金耐蚀性的作用

1)
北京科技大学工程技术研究院, 北京 100086, 中国
2)
上海交通大学材料科学与工程学院, 上海 200240, 中国

通讯作者:
江海涛 E-mail: jianght@ustb.edu.cn

文章亮点

（1）系统地研究了微量Ca和Sn对Mg–3Al–1Zn合金腐蚀性能的影响。

（2）揭示了微量Ca和Sn提高Mg–3Al–1Zn合金耐蚀性的内在机理并构建了腐蚀模型。

（3）AZ31–0.2Sn合金的耐腐蚀性能最好，AZ31–0.2Ca 次之，而 AZ31 合金最差。

中文摘要

镁合金耐腐蚀性差极大限制了商用镁合金的广泛应用。微合金化是提高镁合金腐蚀性能最简单有效的方法。基于低成本合金成分设计，通过扫描开尔文探针力显微镜、析氢、电化学测试和腐蚀形态分析表征了含有微量 Ca 或 Sn 元素的商用 Mg–3Al–1Zn (AZ31) 合金的腐蚀行为。结果表明：在 AZ31 合金中，Al₂Ca/α-Mg和Mg₂Sn/α-Mg的电势差分别为 (230 ± 19) mV和(80 ± 6) mV，远低于Al₈Mn₅/α-Mg的电势差(430 ± 31) mV，即AZ31–0.2Sn合金的耐腐蚀性能最好，AZ31–0.2Ca 次之，而 AZ31 合金最差。此外，Sn溶入基体当中明显提高了α-Mg的电势，并在基体界面形成了致密的SnO₂膜，而Ca元素通过富集在腐蚀产物层当中，使得AZ31–0.2Ca/Sn合金的腐蚀产物层比AZ31合金更加致密、稳定和更具保护性。因此，含0.2wt% Ca或Sn元素的AZ31合金表现出优异的耐腐蚀性能，具有更全面的商业应用潜力。

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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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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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