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Magnesium alloysMagnesium alloy remain of growing interest due to high specific strengthStrength and low density. However, inadequate corrosion resistanceCorrosion resistance of magnesium alloysMagnesium alloy has restricted their application. Alloying is an effective way to inhibit the corrosionCorrosion of magnesium alloysMagnesium alloy. Mg-Sn-based alloys exhibit excellent mechanical propertiesMechanical properties comparable with Mg-Al-based alloys. In this study, Mg-4Sn-3Al-1Zn-0.4Mn alloyMg-4Sn-3Al-1Zn-0.4Mn alloy was investigated in reference to Mg-4Al-1Zn-0.4Mn alloy, aiming to clarify the role of SnSn alloying in the corrosionCorrosion performance at the microstructural level. The surface corrosionCorrosion morphology of the alloys was observed for immersion tests, using X-ray Micro-Computed TomographyX-ray Micro-Computed Tomography (XRM-CT) and analytical scanning electron microscopy (SEM). The 0corrosionCorrosion performance was also measured using hydrogen evolution and electrochemical tests. The results indicate that the corrosionCorrosion rates of Mg-4Sn-3Al-1Zn-0.4Mn is  ~2–3 times higher than that of Mg-4Al-1Zn-0.4Mn, as measured by both hydrogen evolution tests and electrochemical tests. CorrosionCorrosion morphology observation shows that the Mg-4Al-1Zn-0.4Mn mainly exhibits uniform corrosionCorrosion, while the Mg-4Sn-3Al-1Zn-0.4Mn shows local corrosionCorrosion. Mg2Sn particles and Sn segregationSn segregation within α-Mg dendritesDendrites play an important role in appearance of local corrosionCorrosion.

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Influences of Sn Alloying on the Corrosion Behaviour and Morphology of a Mg-3Al-1Zn-0.4Mn Alloy

  • 会议论文

  • 发表日期：

    2025年

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  • Caini Liu,
  • Yang Yang,
  • Yangchao Deng,
  • Wei Sun,
  • Yonghong Zhang,
  • Ruifeng Zhang,
  • Guang Zeng

摘要

Magnesium alloysMagnesium alloy remain of growing interest due to high specific strengthStrength and low density. However, inadequate corrosion resistanceCorrosion resistance of magnesium alloysMagnesium alloy has restricted their application. Alloying is an effective way to inhibit the corrosionCorrosion of magnesium alloysMagnesium alloy. Mg-Sn-based alloys exhibit excellent mechanical propertiesMechanical properties comparable with Mg-Al-based alloys. In this study, Mg-4Sn-3Al-1Zn-0.4Mn alloyMg-4Sn-3Al-1Zn-0.4Mn alloy was investigated in reference to Mg-4Al-1Zn-0.4Mn alloy, aiming to clarify the role of SnSn alloying in the corrosionCorrosion performance at the microstructural level. The surface corrosionCorrosion morphology of the alloys was observed for immersion tests, using X-ray Micro-Computed TomographyX-ray Micro-Computed Tomography (XRM-CT) and analytical scanning electron microscopy (SEM). The 0corrosionCorrosion performance was also measured using hydrogen evolution and electrochemical tests. The results indicate that the corrosionCorrosion rates of Mg-4Sn-3Al-1Zn-0.4Mn is  ~2–3 times higher than that of Mg-4Al-1Zn-0.4Mn, as measured by both hydrogen evolution tests and electrochemical tests. CorrosionCorrosion morphology observation shows that the Mg-4Al-1Zn-0.4Mn mainly exhibits uniform corrosionCorrosion, while the Mg-4Sn-3Al-1Zn-0.4Mn shows local corrosionCorrosion. Mg2Sn particles and Sn segregationSn segregation within α-Mg dendritesDendrites play an important role in appearance of local corrosionCorrosion.