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<p>The corrosion resistance of FeCoNi MEA in 3.5% NaCl solution with different concentrations of NaHCO<sub>3</sub> was systematically studied. The results show that the addition of HCO<sub>3</sub><sup>−</sup> effectively improves the anti-corrosion property of the MEA, which is mainly verified by the nobler pitting potential (<i>E</i><sub>p</sub>), the decreased passive current density (<i>i</i><sub><i>p</i></sub>), and donor density (<i>N</i><sub>D</sub>). The protective effect of HCO<sub>3</sub><sup>−</sup> is due to the competitive adsorption between HCO<sub>3</sub><sup>−</sup> and Cl<sup>−</sup> to some extent. Moreover, the presence of HCO<sub>3</sub><sup>−</sup> changes the composition of passive film, increases the contents of iron oxides with low electrochemical activity, reduces the amount of holes, and enhances its protective performance. In addition, after the participation of HCO<sub>3</sub><sup>−</sup>, the possibility that metastable pitting transforms into stable pitting is reduced, as well as both the quantity and size of pits on the MEA exhibit a tendency of decline. The comprehensive dissolution of all elements occurs in the MEA substrate, inducing the generation of pitting corrosion.</p>

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Effect of Bicarbonate Ions on Corrosion Characteristics of FeCoNi Medium-Entropy Alloy in Simulated Marine Water

  • 期刊论文

  • 发表日期：

    2025年4月15日

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

摘要

The corrosion resistance of FeCoNi MEA in 3.5% NaCl solution with different concentrations of NaHCO3 was systematically studied. The results show that the addition of HCO3− effectively improves the anti-corrosion property of the MEA, which is mainly verified by the nobler pitting potential (Ep), the decreased passive current density (ip), and donor density (ND). The protective effect of HCO3− is due to the competitive adsorption between HCO3− and Cl− to some extent. Moreover, the presence of HCO3− changes the composition of passive film, increases the contents of iron oxides with low electrochemical activity, reduces the amount of holes, and enhances its protective performance. In addition, after the participation of HCO3−, the possibility that metastable pitting transforms into stable pitting is reduced, as well as both the quantity and size of pits on the MEA exhibit a tendency of decline. The comprehensive dissolution of all elements occurs in the MEA substrate, inducing the generation of pitting corrosion.