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<p>Alumina-forming austenitic (AFA) steel was exposed to liquid lead<b>-</b>bismuth eutectic (LBE) at 500&#xa0;°C under oxygen-saturated conditions (10<sup>− 4</sup> wt%) and oxygen-depleted conditions (10<sup>− 7</sup> wt%). Morphology, phase composition, microstructural evolution, and elemental distribution of the oxide scale were characterized. The results reveal that under oxygen-saturated conditions, two distinct oxide regions form on AFA steel, both exhibiting high density and strong protective capability against LBE corrosion. In contrast, under oxygen-depleted conditions, a loose and porous Fe<sub>3</sub>O<sub>4</sub> layer develops, which fails to effectively suppress LBE penetration, leading to selective dissolution of alloying elements and subsequent transformation of austenite to ferrite at the corrosion front.</p>

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Corrosion Behavior of Alumina-Forming Austenitic Steel in Liquid Lead–Bismuth at 500 ℃

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Xinlei Li,
  • Hao Wang,
  • Fujian Zhang,
  • Bin Tang,
  • Ning Guo

摘要

Alumina-forming austenitic (AFA) steel was exposed to liquid lead-bismuth eutectic (LBE) at 500 °C under oxygen-saturated conditions (10− 4 wt%) and oxygen-depleted conditions (10− 7 wt%). Morphology, phase composition, microstructural evolution, and elemental distribution of the oxide scale were characterized. The results reveal that under oxygen-saturated conditions, two distinct oxide regions form on AFA steel, both exhibiting high density and strong protective capability against LBE corrosion. In contrast, under oxygen-depleted conditions, a loose and porous Fe3O4 layer develops, which fails to effectively suppress LBE penetration, leading to selective dissolution of alloying elements and subsequent transformation of austenite to ferrite at the corrosion front.