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<p>In this work, the corrosion characteristic of CoCrFeMnNi HEA in chloride-containing NaOH solution with various CO<sub>3</sub><sup>2−</sup> contents ranging from 0 to 10&#xa0;wt.% was systematically researched via a series of experiments. The results demonstrate that the elevated passive current density (<i>i</i><sub>p</sub>) and the declined corrosion potential (<i>E</i><sub>corr</sub>) verify the reduced the anti-corrosion property of the HEA with rising CO<sub>3</sub><sup>2−</sup> concentration. Moreover, the thinned thickness and the diminished repassivation capability of the passivation film, as well as the increased film roughness, indicates a weakened protectiveness of the film. In addition, CO<sub>3</sub><sup>2−</sup>disrupts the structure of the passivation film, accelerates the film breakdown, resulting in the degraded passivity and the declined <i>R</i><sub>ct</sub> value, thus speeding up the electrode reaction. As the CO<sub>3</sub><sup>2−</sup> content augments, small pits propagate to large corrosion pits and spread over extensive areas, causing the higher corrosion rate, which markedly deteriorates the anti-corrosion performance of the HEA.</p>

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Exploring the Damaging Influence of Carbonate Ion on the Corrosion Resistance of CoCrFeMnNi High-Entropy Alloy in Chloride-Containing Strongly Alkaline Solution

  • 期刊论文

  • 发表日期：

    2026年5月15日

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  • M. Zhu,
  • J. T. Zhang,
  • K. L. Lou,
  • Y. L. Chen,
  • Y. F. Yuan

摘要

In this work, the corrosion characteristic of CoCrFeMnNi HEA in chloride-containing NaOH solution with various CO32− contents ranging from 0 to 10 wt.% was systematically researched via a series of experiments. The results demonstrate that the elevated passive current density (ip) and the declined corrosion potential (Ecorr) verify the reduced the anti-corrosion property of the HEA with rising CO32− concentration. Moreover, the thinned thickness and the diminished repassivation capability of the passivation film, as well as the increased film roughness, indicates a weakened protectiveness of the film. In addition, CO32−disrupts the structure of the passivation film, accelerates the film breakdown, resulting in the degraded passivity and the declined Rct value, thus speeding up the electrode reaction. As the CO32− content augments, small pits propagate to large corrosion pits and spread over extensive areas, causing the higher corrosion rate, which markedly deteriorates the anti-corrosion performance of the HEA.