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<p>The microstructural changes in Mg-2Zn-0.4Ca alloys formed by medium-temperature rolling were characterized using multiple techniques, and their corrosion behavior in simulated body fluid (SBF) was evaluated through weight loss, hydrogen evolution, and electrochemical polarization corrosion tests. The study found that an increase in rolling temperature leads to a gradual increase in the degree of dynamic recrystallization (DRX) of the Mg-2Zn-0.4Ca alloy, a gradual decrease in dislocation density, and a more uniform microstructure. When the rolling temperature was raised to 350&#xa0;°C, the alloy reached an average grain size of 4.83&#xa0;μm, but the number of highly deformed grains decreased significantly, and the grains became more uniform and equiaxed overall. For the Mg-2Zn-0.4Ca alloy, low dislocation density and a high degree of dynamic recrystallization (DRX) are key factors influencing the alloy’s biocorrosion resistance. As the rolling temperature increases, the biocorrosion resistance of the Mg-2Zn-0.4Ca alloy improves significantly, reaching its optimum at 350&#xa0;°C.</p>

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Study on the degradation behavior of a Mg-2Zn-0.4Ca magnesium alloy formed at medium and high temperatures

  • 期刊论文

  • 发表日期：

    2026年6月3日

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  • Kaifei Zhang,
  • Youping Sun,
  • Jiangmei He,
  • Wangzhen Li,
  • Wengang Chen,
  • Qian Li

摘要

The microstructural changes in Mg-2Zn-0.4Ca alloys formed by medium-temperature rolling were characterized using multiple techniques, and their corrosion behavior in simulated body fluid (SBF) was evaluated through weight loss, hydrogen evolution, and electrochemical polarization corrosion tests. The study found that an increase in rolling temperature leads to a gradual increase in the degree of dynamic recrystallization (DRX) of the Mg-2Zn-0.4Ca alloy, a gradual decrease in dislocation density, and a more uniform microstructure. When the rolling temperature was raised to 350 °C, the alloy reached an average grain size of 4.83 μm, but the number of highly deformed grains decreased significantly, and the grains became more uniform and equiaxed overall. For the Mg-2Zn-0.4Ca alloy, low dislocation density and a high degree of dynamic recrystallization (DRX) are key factors influencing the alloy’s biocorrosion resistance. As the rolling temperature increases, the biocorrosion resistance of the Mg-2Zn-0.4Ca alloy improves significantly, reaching its optimum at 350 °C.