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<p>The corrosion and passivation behaviors of FeCoNi MEA were investigated in simulated seawater with varying NO<sub>3</sub><sup>−</sup> contents (0 ~ 0.1&#xa0;mol/L). The results indicate that the anti-corrosion property of the MEA improves with increasing NO<sub>3</sub><sup>−</sup> content, as demonstrated by lower i<sub>p</sub>, reduced defect density, fewer metastable pits, and mild corrosion characteristics. The beneficial impact of NO<sub>3</sub><sup>−</sup> is primarily ascribed to the competitive adsorption between NO<sub>3</sub><sup>−</sup> and highly corrosive Cl<sup>−</sup>. Specifically, NO<sub>3</sub><sup>−</sup> occupies active positions and repairs the damaged passive film, resulting in the generation of more protective film, thus preventing Cl<sup>−</sup> from attacking the MEA, which enhances its corrosion resistance. In addition, the substrate undergoes comprehensive dissolution of elements, inducing the production of pits.</p>

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Research on the Enhanced Corrosion Resistance of FeCoNi Medium Entropy Alloy in Simulated Seawater Containing NO3−

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • Z. X. Ye,
  • M. Zhu,
  • Y. F. Yuan

摘要

The corrosion and passivation behaviors of FeCoNi MEA were investigated in simulated seawater with varying NO3− contents (0 ~ 0.1 mol/L). The results indicate that the anti-corrosion property of the MEA improves with increasing NO3− content, as demonstrated by lower ip, reduced defect density, fewer metastable pits, and mild corrosion characteristics. The beneficial impact of NO3− is primarily ascribed to the competitive adsorption between NO3− and highly corrosive Cl−. Specifically, NO3− occupies active positions and repairs the damaged passive film, resulting in the generation of more protective film, thus preventing Cl− from attacking the MEA, which enhances its corrosion resistance. In addition, the substrate undergoes comprehensive dissolution of elements, inducing the production of pits.