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<p>Mg<sub>4</sub>(TiZnSn)<sub>3</sub>, a rare-earth-free Mg-based multi-principal element alloy, was synthesized via high-energy ball milling and cold compaction. Potentiodynamic polarization in 0.1&#xa0;M NaCl revealed spontaneous passivation with a corrosion current density of 8.96 ± 0.83 µA/cm<sup>2</sup> and a nobler than Mg corrosion potential of -1058.35 ± 15.91 mV<sub>SCE</sub>. X-ray photoelectron spectroscopy confirmed the formation of a mixed oxide film containing ZnO, SnO<sub>2</sub>, and TiO<sub>2</sub>, contributing to the observed passivity. The alloy also exhibited improved mechanical performance, with a hardness of 5.06 ± 0.41 GPa and Young’s modulus of 109.24 ± 10 GPa. These results demonstrate that tailored multi-element alloying and powder metallurgy can synergistically enhance both corrosion resistance and mechanical properties in Mg alloys.</p>

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Spontaneous passivation in a Rare-Earth-Free Mg4(TiZnSn)3 Multi-Principal element alloy

  • 期刊论文

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  • 发表日期：

    2025年8月13日

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  • Alexander T. Helmer,
  • Rajeev K. Gupta

摘要

Mg4(TiZnSn)3, a rare-earth-free Mg-based multi-principal element alloy, was synthesized via high-energy ball milling and cold compaction. Potentiodynamic polarization in 0.1 M NaCl revealed spontaneous passivation with a corrosion current density of 8.96 ± 0.83 µA/cm2 and a nobler than Mg corrosion potential of -1058.35 ± 15.91 mVSCE. X-ray photoelectron spectroscopy confirmed the formation of a mixed oxide film containing ZnO, SnO2, and TiO2, contributing to the observed passivity. The alloy also exhibited improved mechanical performance, with a hardness of 5.06 ± 0.41 GPa and Young’s modulus of 109.24 ± 10 GPa. These results demonstrate that tailored multi-element alloying and powder metallurgy can synergistically enhance both corrosion resistance and mechanical properties in Mg alloys.