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<p>This study systematically examines the microstructural modifications and corrosion performance alterations in both homogenized and extruded TAZ321 magnesium alloys induced by trace Y and Nd additions. The findings indicate that hot extrusion significantly diminished grain sizes to 5&#xa0;μm. The second phases consisted primarily of Mg<sub>2</sub>Sn, Al<sub>2</sub>Y, Al<sub>3</sub>Y, and Al<sub>2</sub>Nd, as rare earth elements preferentially reacted with Al. Immersion testing and electrochemical characterization in 3.5 wt% NaCl solution confirmed the superior corrosion resistance of H-0.6Y alloy, manifesting a minimal corrosion rate of 1.273&#xa0;mm/y. Rare earth elements synergized with Sn to elevate corrosion potential and suppress corrosion rate. The corrosion products formed a protective composite layer of Mg(OH)<sub>2</sub>/MgO/Al<sub>2</sub>O<sub>3</sub>, with the addition of Y resulting in the most compact film. While galvanic coupling and pitting dominated corrosion mechanisms, rare earth element additions effectively mitigated these processes. Notably, while homogenized alloys demonstrate superior corrosion resistance attributable to reduced second phases and suppressed micro-galvanic effects, the substantially enhanced mechanical properties of extruded alloys—exemplified by the 207&#xa0;MPa yield strength of EX-0.6Nd—effectively counterbalance their corrosion resistance limitations, validating their applicability as structural components in corrosion-controlled service environments.</p>

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Effect of Trace Y and Nd Addition on Microstructure and Corrosion Resistance of Mg-3Sn-2Al-1Zn Alloys

  • 期刊论文

  • 发表日期：

    2025年6月28日

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  • Shang Xie,
  • Xuancheng He,
  • Yuhang Guo,
  • Ye Cheng,
  • Wenyu Tang,
  • Lei Wang,
  • Qing Dong,
  • Fengjian Shi,
  • Weiguo Yang

摘要

This study systematically examines the microstructural modifications and corrosion performance alterations in both homogenized and extruded TAZ321 magnesium alloys induced by trace Y and Nd additions. The findings indicate that hot extrusion significantly diminished grain sizes to 5 μm. The second phases consisted primarily of Mg2Sn, Al2Y, Al3Y, and Al2Nd, as rare earth elements preferentially reacted with Al. Immersion testing and electrochemical characterization in 3.5 wt% NaCl solution confirmed the superior corrosion resistance of H-0.6Y alloy, manifesting a minimal corrosion rate of 1.273 mm/y. Rare earth elements synergized with Sn to elevate corrosion potential and suppress corrosion rate. The corrosion products formed a protective composite layer of Mg(OH)2/MgO/Al2O3, with the addition of Y resulting in the most compact film. While galvanic coupling and pitting dominated corrosion mechanisms, rare earth element additions effectively mitigated these processes. Notably, while homogenized alloys demonstrate superior corrosion resistance attributable to reduced second phases and suppressed micro-galvanic effects, the substantially enhanced mechanical properties of extruded alloys—exemplified by the 207 MPa yield strength of EX-0.6Nd—effectively counterbalance their corrosion resistance limitations, validating their applicability as structural components in corrosion-controlled service environments.