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<p>This study systematically explores the influence of varying thiosulfate (S<sub>2</sub>O<sub>3</sub><sup>2−</sup>) contents on the corrosion characteristics of CoCrFeMnNi HEA in a simulated highly alkaline medium. The results reveal that thiosulfate markedly impairs the corrosion protection performance of the HEA. Specifically, at high S<sub>2</sub>O<sub>3</sub><sup>2−</sup> concentration, the passive current density (<i>i</i>ₚ) and corrosion rate increases remarkably, and the integrity of the passivation film is severely compromised. The rising S<sub>2</sub>O<sub>3</sub><sup>2−</sup> content reduces the protection, thickness and stability of the passive film, leading to an increase in the metastable pitting density of the HEA. In addition, the corrosion feature of the alloy evolves from minor pitting without S<sub>2</sub>O<sub>3</sub><sup>2−</sup> to grooved and exfoliated corrosion shapes at 2% S<sub>2</sub>O<sub>3</sub><sup>2−</sup>. The competitive adsorption between thiosulfate and OH<sup>−</sup> dramatically weakens the anti-corrosion property of the HEA.</p>

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Elucidating the Adverse Impact of Thiosulfate Ion on the Anti-corrosion Property of CoCrFeMnNi High Entropy Alloy in Aggressive Alkaline Medium

  • 期刊论文

  • 发表日期：

    2026年7月27日

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  • M. Zhu,
  • J. T. Zhang,
  • Y. F. Yuan,
  • G. Y. Wei

摘要

This study systematically explores the influence of varying thiosulfate (S2O32−) contents on the corrosion characteristics of CoCrFeMnNi HEA in a simulated highly alkaline medium. The results reveal that thiosulfate markedly impairs the corrosion protection performance of the HEA. Specifically, at high S2O32− concentration, the passive current density (iₚ) and corrosion rate increases remarkably, and the integrity of the passivation film is severely compromised. The rising S2O32− content reduces the protection, thickness and stability of the passive film, leading to an increase in the metastable pitting density of the HEA. In addition, the corrosion feature of the alloy evolves from minor pitting without S2O32− to grooved and exfoliated corrosion shapes at 2% S2O32−. The competitive adsorption between thiosulfate and OH− dramatically weakens the anti-corrosion property of the HEA.