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<p>The corrosion behavior of CoCrFeMnNi HEA in varying NaOH concentrations was comprehensively investigated. The results imply that with increasing OH<sup>−</sup> content, the charge transfer resistance (R<sub>ct</sub>) and passivation film resistance (R<sub>f</sub>) values of the HEA decrease, while the degree of pitting corrosion intensifies, indicating a negative correlation between OH<sup>−</sup> content and the corrosion resistance of the alloy. Particularly at high OH<sup>−</sup> concentration of 1.25&#xa0;mol·L<sup>−1</sup>, the passivation film produced on the alloy surface is the thinnest, with the greatest carrier density and the fastest dissolution rate, which notably reduces its protectiveness. In addition, increased OH<sup>−</sup> ions result in the augmented pores within the film and promote the generation of hydroxides with low compactness, which severely impairs the anti-corrosion performance of the HEA. Besides, the enhancement in the amount and height of metastable pitting peaks reveals that with the increase in solution alkalinity, the HEA exhibits visibly deteriorated resistance to pitting nucleation and propagation. Moreover, rising OH<sup>−</sup> level accelerates the preferential dissolution of elements, thereby leading to the generation of larger pits.</p>

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Unraveling the Effect of Different NaOH Contents on the Corrosion Characteristic of CoCrFeMnNi High-Entropy Alloy

  • 期刊论文

  • 发表日期：

    2026年2月16日

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

摘要

The corrosion behavior of CoCrFeMnNi HEA in varying NaOH concentrations was comprehensively investigated. The results imply that with increasing OH− content, the charge transfer resistance (Rct) and passivation film resistance (Rf) values of the HEA decrease, while the degree of pitting corrosion intensifies, indicating a negative correlation between OH− content and the corrosion resistance of the alloy. Particularly at high OH− concentration of 1.25 mol·L−1, the passivation film produced on the alloy surface is the thinnest, with the greatest carrier density and the fastest dissolution rate, which notably reduces its protectiveness. In addition, increased OH− ions result in the augmented pores within the film and promote the generation of hydroxides with low compactness, which severely impairs the anti-corrosion performance of the HEA. Besides, the enhancement in the amount and height of metastable pitting peaks reveals that with the increase in solution alkalinity, the HEA exhibits visibly deteriorated resistance to pitting nucleation and propagation. Moreover, rising OH− level accelerates the preferential dissolution of elements, thereby leading to the generation of larger pits.