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<p>In this study, the corrosion behavior of Si-modified austenitic stainless steels with and without 1 wt pct Mo alloying was investigated in oxygen-saturated lead-bismuth eutectic (LBE) at 550&#xa0;°C for up to 2000 hours. Quantitative measurements showed that the Mo-doped steel developed a significantly thinner oxide scale (≈ 12.3&#xa0;<i>μ</i>m) than the Mo-free alloy (≈ 20.1&#xa0;<i>μ</i>m), demonstrating enhanced resistance to LBE corrosion. Combined experimental characterization (SEM/EPMA/TEM/TKD) and first-principles calculations revealed that Mo addition lowers the formation energy of Fe–Cr spinel, promoting the formation of a dense inner oxide layer consisting of Si- and Mo-containing spinel intermixed with fine Fe–Ni particles. This compact inner oxide exhibited slower inward growth and acted as an effective barrier to Pb penetration. Moreover, Mo facilitated Cr<sub>2</sub>O<sub>3</sub> precipitation at SiO<sub>2</sub>-decorated grain boundaries through the third-element effect, thereby suppressing Fe and O diffusion and further improving corrosion resistance. These synergistic effects between Si and Mo provide important insight into the design of LBE-resistant austenitic steels.</p>

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Effect of Molybdenum on the Corrosion Resistance of Si-Modified Austenitic Stainless Steel Exposed to Oxygen-Saturated Lead-Bismuth Eutectic at 550 °C

  • 期刊论文

  • 发表日期：

    2026年3月14日

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  • Shuzhan Zhang,
  • Yuanfei Su,
  • Shengxuan Jiao,
  • Xianbo Shi,
  • Wei Yan,
  • Lijian Rong

摘要

In this study, the corrosion behavior of Si-modified austenitic stainless steels with and without 1 wt pct Mo alloying was investigated in oxygen-saturated lead-bismuth eutectic (LBE) at 550 °C for up to 2000 hours. Quantitative measurements showed that the Mo-doped steel developed a significantly thinner oxide scale (≈ 12.3 μm) than the Mo-free alloy (≈ 20.1 μm), demonstrating enhanced resistance to LBE corrosion. Combined experimental characterization (SEM/EPMA/TEM/TKD) and first-principles calculations revealed that Mo addition lowers the formation energy of Fe–Cr spinel, promoting the formation of a dense inner oxide layer consisting of Si- and Mo-containing spinel intermixed with fine Fe–Ni particles. This compact inner oxide exhibited slower inward growth and acted as an effective barrier to Pb penetration. Moreover, Mo facilitated Cr2O3 precipitation at SiO2-decorated grain boundaries through the third-element effect, thereby suppressing Fe and O diffusion and further improving corrosion resistance. These synergistic effects between Si and Mo provide important insight into the design of LBE-resistant austenitic steels.