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<p>The extruded high-strength rare earth magnesium alloy Mg-10Gd-3Y-0.4Zr (GW103K) is in significant demand within the automotive and aerospace industry. The dynamic recrystallization and corrosion behavior of deformed GW103K alloy with different extrusion ratios (22 and 72) were studied. Experimental results reveal that the corrosion of the original grains in the as-cast alloy mainly occurs within the grains, while the recrystallized structure of the extruded alloy exhibits intergranular corrosion during the corrosion process. The uniformity of grain size in the GW103K alloy with a larger extrusion ratio enhances its corrosion resistance. Potential polarization curves and impedance spectra were used to evaluate the corrosion performance. From the impedance perspective, the high-frequency capacitive reactance arc tends to increase with the increase in the extrusion ratio. When the immersion time is extended to 12&#xa0;h, the surface oxide film of the GW103K alloy with a larger extrusion ratio remains stable and exhibits excellent corrosion resistance.</p>

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Effect of Recrystallization Behavior on Corrosion Resistance of Extruded GW103K Magnesium Alloy

  • 期刊论文

  • 发表日期：

    2025年4月23日

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  • Ruiling Jia,
  • Jianna Li,
  • Minghui Sun,
  • Shuang Yu,
  • Huixia Zhang,
  • Wenhua Cheng

摘要

The extruded high-strength rare earth magnesium alloy Mg-10Gd-3Y-0.4Zr (GW103K) is in significant demand within the automotive and aerospace industry. The dynamic recrystallization and corrosion behavior of deformed GW103K alloy with different extrusion ratios (22 and 72) were studied. Experimental results reveal that the corrosion of the original grains in the as-cast alloy mainly occurs within the grains, while the recrystallized structure of the extruded alloy exhibits intergranular corrosion during the corrosion process. The uniformity of grain size in the GW103K alloy with a larger extrusion ratio enhances its corrosion resistance. Potential polarization curves and impedance spectra were used to evaluate the corrosion performance. From the impedance perspective, the high-frequency capacitive reactance arc tends to increase with the increase in the extrusion ratio. When the immersion time is extended to 12 h, the surface oxide film of the GW103K alloy with a larger extrusion ratio remains stable and exhibits excellent corrosion resistance.