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<p>The corrosion behavior of 304L and a high Si-containing (HS) austenitic stainless steel (SS) in hot nitric acid solution containing Ce<sup>3+</sup> or Ce<sup>4+</sup> ions was investigated. Mass loss test, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy, energy dispersive spectrometer, and X-ray photoelectron spectrometer were utilized. The results demonstrated that Ce<sup>3+</sup> ions had minimal impact, whereas Ce<sup>4+</sup> ions greatly enhanced the corrosion rates and cathodic reactions of 304L and HS SS, indicating the powerful oxidizing ability of Ce<sup>4+</sup> ions. HS SS experienced uniform corrosion, while intergranular corrosion (IGC) was observed in 304L SS with significant enrichment of Cr and depletion of Fe and Ni at corroded grain boundaries. A novel mechanism distinct from conventional Cr-depleted regions was proposed to explain this phenomenon, and the low IGC sensitivity of HS SS was discussed.</p>

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Corrosion behavior of 304L and high Si-containing austenitic stainless steels in hot nitric acid solution containing Ce3+ or Ce4+ ions

  • 期刊论文

  • 发表日期：

    2026年1月12日

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  • Qi-Qian Chen,
  • Wan-Qi Chen,
  • Yue Zheng,
  • Ai-Li Ma,
  • Xi-Wen Hu,
  • Lian-Min Zhang,
  • Yan-Fen Li,
  • Jia-Rong Zhang,
  • Lei Xu,
  • Zi-Xuan Ding,
  • Zhong-Liang Liu,
  • Yu-Gui Zheng

摘要

The corrosion behavior of 304L and a high Si-containing (HS) austenitic stainless steel (SS) in hot nitric acid solution containing Ce3+ or Ce4+ ions was investigated. Mass loss test, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy, energy dispersive spectrometer, and X-ray photoelectron spectrometer were utilized. The results demonstrated that Ce3+ ions had minimal impact, whereas Ce4+ ions greatly enhanced the corrosion rates and cathodic reactions of 304L and HS SS, indicating the powerful oxidizing ability of Ce4+ ions. HS SS experienced uniform corrosion, while intergranular corrosion (IGC) was observed in 304L SS with significant enrichment of Cr and depletion of Fe and Ni at corroded grain boundaries. A novel mechanism distinct from conventional Cr-depleted regions was proposed to explain this phenomenon, and the low IGC sensitivity of HS SS was discussed.