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<p>In this study, the Mg-6Zn-0.5Mn (ZM60) alloy was prepared using the casting method, with Sr and Sc elements added to produce ZM60-0.9Sr, ZM60-0.3Sc, and ZM60-0.9Sr0.3Sc alloys. Homogenization annealing of these alloys revealed significant variations in grain size across the four alloys. After rolling, the grains and residual phases underwent deformation and substantial refinement. Recrystallization occurred in the ZM60 alloy, but the grain sizes varied significantly between different regions. The addition of 0.3% Sc to ZM60 effectively inhibited grain growth during recrystallization, while 0.9% Sr promoted grain growth and reduced grain size variation. The combined addition of 0.3% Sc and 0.9% Sr led to a pronounced tendency for equiaxed grains. The ultimate tensile strength and yield strength of ZM60-0.9Sr, ZM60-0.3Sc, and ZM60-0.9Sr0.3Sc alloys were higher than those of ZM60, with ZM60-0.9Sr0.3Sc exhibiting the highest tensile strength (362.41 MPa) and yield strength (205.99 MPa). Potentiodynamic polarization and immersion tests in Hank’s solution showed that ZM60-0.9Sr0.3Sc had the highest corrosion potential. ZM60-0.3Sc demonstrated the lowest corrosion current and the largest impedance arc radius, indicating the formation of a highly protective corrosion film. Corrosion morphology analysis revealed that ZM60-0.9Sr0.3Sc exhibited a trend toward uniform corrosion.</p>

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Effects of Sr and Sc combined alloying on the mechanical properties and corrosion behavior of Mg-6Zn-0.5Mn alloy

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Dongsong Yin,
  • Tianming Han,
  • Zhiyuan Liu,
  • Yong Mao,
  • Yilin Yang,
  • Yuting Zhou

摘要

In this study, the Mg-6Zn-0.5Mn (ZM60) alloy was prepared using the casting method, with Sr and Sc elements added to produce ZM60-0.9Sr, ZM60-0.3Sc, and ZM60-0.9Sr0.3Sc alloys. Homogenization annealing of these alloys revealed significant variations in grain size across the four alloys. After rolling, the grains and residual phases underwent deformation and substantial refinement. Recrystallization occurred in the ZM60 alloy, but the grain sizes varied significantly between different regions. The addition of 0.3% Sc to ZM60 effectively inhibited grain growth during recrystallization, while 0.9% Sr promoted grain growth and reduced grain size variation. The combined addition of 0.3% Sc and 0.9% Sr led to a pronounced tendency for equiaxed grains. The ultimate tensile strength and yield strength of ZM60-0.9Sr, ZM60-0.3Sc, and ZM60-0.9Sr0.3Sc alloys were higher than those of ZM60, with ZM60-0.9Sr0.3Sc exhibiting the highest tensile strength (362.41 MPa) and yield strength (205.99 MPa). Potentiodynamic polarization and immersion tests in Hank’s solution showed that ZM60-0.9Sr0.3Sc had the highest corrosion potential. ZM60-0.3Sc demonstrated the lowest corrosion current and the largest impedance arc radius, indicating the formation of a highly protective corrosion film. Corrosion morphology analysis revealed that ZM60-0.9Sr0.3Sc exhibited a trend toward uniform corrosion.