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<p>The electrochemical corrosion behavior of CoCrFeMnNi HEA in NaOH solution with varying Cl<sup>−</sup> concentrations was systematically studied. The results demonstrate that adding Cl<sup>−</sup> severely weakens the anti-corrosion performance of the HEA, as demonstrated by the decline of pitting potential (<i>E</i><sub>p</sub>), the augmented passive current density (<i>i</i><sub>p</sub>) and metastable pitting amount. Furthermore, the increased Cl<sup>−</sup> content contributes to the reduction of the passivation film thickness and the prolongation of repassivation time and elevates the flaw density within the film, facilitating the infiltration of aggressive ions, which markedly impairs the protectiveness of surface film and the pitting resistance of the alloy. Particularly, at a high Cl<sup>−</sup> concentration of 1000&#xa0;mg/L, grooving corrosion form is generated on the HEA.</p>

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Uncovering the Impact of Cl− Content on Anti-corrosion Performance of CoCrFeMnNi High Entropy Alloy in Sodium Hydroxide Solution

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • M. Zhu,
  • J. T. Zhang,
  • Y. F. Yuan,
  • S. M. Yin

摘要

The electrochemical corrosion behavior of CoCrFeMnNi HEA in NaOH solution with varying Cl− concentrations was systematically studied. The results demonstrate that adding Cl− severely weakens the anti-corrosion performance of the HEA, as demonstrated by the decline of pitting potential (Ep), the augmented passive current density (ip) and metastable pitting amount. Furthermore, the increased Cl− content contributes to the reduction of the passivation film thickness and the prolongation of repassivation time and elevates the flaw density within the film, facilitating the infiltration of aggressive ions, which markedly impairs the protectiveness of surface film and the pitting resistance of the alloy. Particularly, at a high Cl− concentration of 1000 mg/L, grooving corrosion form is generated on the HEA.