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<p>This work conducted the research on the electrochemical corrosion behavior and surface passive feature of equiatomic CoCrFeMnNi HEA in 3.5 wt.% NaCl solution with various Na<sub>2</sub>CO<sub>3</sub> concentrations utilizing electrochemical tests, immersion experiment and atomic force microscope. The increased pitting potential (E<sub>p</sub>), slighter pitting degree, and the decreased amount of metastable pitting indicate that the pitting resistance of the HEA enhances as CO<sub>3</sub><sup>2−</sup> concentration rises. This is due to the production of thicker, denser and more protective passive film on the alloy surface demonstrated by larger resistance of passive film (R<sub>f</sub>), smaller passive current density (i<sub>p</sub>) and lower carrier density. The existence of CO<sub>3</sub><sup>2−</sup> decreases the holes within the passivation film, improves the passivity of the HEA, and heightens its anti-corrosion performance. Besides, the addition of CO<sub>3</sub><sup>2−</sup> promotes the generation of steady iron oxides and strengthens the protection of passive film.</p>

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Insight into the Role of CO32− in Enhancing Anti-corrosion Capability of CoCrFeMnNi High-Entropy Alloy in Simulated Ocean Environment

  • 期刊论文

  • 发表日期：

    2025年5月12日

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

摘要

This work conducted the research on the electrochemical corrosion behavior and surface passive feature of equiatomic CoCrFeMnNi HEA in 3.5 wt.% NaCl solution with various Na2CO3 concentrations utilizing electrochemical tests, immersion experiment and atomic force microscope. The increased pitting potential (Ep), slighter pitting degree, and the decreased amount of metastable pitting indicate that the pitting resistance of the HEA enhances as CO32− concentration rises. This is due to the production of thicker, denser and more protective passive film on the alloy surface demonstrated by larger resistance of passive film (Rf), smaller passive current density (ip) and lower carrier density. The existence of CO32− decreases the holes within the passivation film, improves the passivity of the HEA, and heightens its anti-corrosion performance. Besides, the addition of CO32− promotes the generation of steady iron oxides and strengthens the protection of passive film.