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<p>This work is dedicated to exploring the damaging influence of NH<sub>4</sub><sup>+</sup> concentration on the corrosion resistance of CoCrFeMnNi HEA in 3.5 wt.% NaCl solution. Lower pitting potential (<i>E</i><sub>p</sub>), larger hysteresis ring area and more severe pitting degree demonstrate that the pitting corrosion resistance of the HEA shows a decreasing trend as the content of NH<sub>4</sub><sup>+</sup> augments. The addition of NH<sub>4</sub><sup>+</sup> significantly impairs the density and stability of the surface film, which is validated by the reduced resistance of passive film (<i>R</i><sub>f</sub>), the elevated passivation film capacitance (<i>Q</i><sub>f</sub>) and the increased carrier density. Moreover, along with the rise in NH<sub>4</sub><sup>+</sup> concentration, the acidification of the electrolyte intensifies, giving rise to a substantial quantity of defects inside the passivation film, which severely weakens the film's protectiveness and undermines the passivity of the HEA, facilitating the occurrence of metastable pit.</p>

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Investigation of the Impact of NH4+ Addition on the Corrosion Behavior and Mechanism of CoCrFeMnNi HEA in a Simulated Oceanic Environment

  • 期刊论文

  • 发表日期：

    2025年10月24日

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  • Y. Q. Lu,
  • M. Zhu,
  • Y. F. Yuan

摘要

This work is dedicated to exploring the damaging influence of NH4+ concentration on the corrosion resistance of CoCrFeMnNi HEA in 3.5 wt.% NaCl solution. Lower pitting potential (Ep), larger hysteresis ring area and more severe pitting degree demonstrate that the pitting corrosion resistance of the HEA shows a decreasing trend as the content of NH4+ augments. The addition of NH4+ significantly impairs the density and stability of the surface film, which is validated by the reduced resistance of passive film (Rf), the elevated passivation film capacitance (Qf) and the increased carrier density. Moreover, along with the rise in NH4+ concentration, the acidification of the electrolyte intensifies, giving rise to a substantial quantity of defects inside the passivation film, which severely weakens the film's protectiveness and undermines the passivity of the HEA, facilitating the occurrence of metastable pit.