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Abstract <p>High-entropy alloys offer excellent structural properties, yet their corrosion behavior in complex environments is underexplored. The corrosion behavior of the equiatomic CoCrFeMnNi HEA was investigated in 3.5 wt.% NaCl and NaCl containing 0.05&#xa0;M NaHSO₃ using electrochemical techniques, SEM–EDS analysis, and density functional theory (DFT) calculations. In NaCl, the alloy forms a stable passive film, showing low corrosion rates and high impedance. However, NaHSO₃ disrupts this layer, increasing corrosion, reducing impedance, and causing pitting with Cr depletion and Cl/S enrichment. DFT reveals HSO₃⁻ adsorbs moderately likely decomposing to S, which binds strongly, outcompeting and blocking passivation.</p> Graphical abstract <p></p>

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Corrosion behavior of CoCrFeMnNi high-entropy alloy in chloride and sulfite environments: Experimental insights and theoretical perspectives

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Shidruk Sayali Ramesh,
  • M. Manjaiah,
  • Prince Sharma

摘要

Abstract

High-entropy alloys offer excellent structural properties, yet their corrosion behavior in complex environments is underexplored. The corrosion behavior of the equiatomic CoCrFeMnNi HEA was investigated in 3.5 wt.% NaCl and NaCl containing 0.05 M NaHSO₃ using electrochemical techniques, SEM–EDS analysis, and density functional theory (DFT) calculations. In NaCl, the alloy forms a stable passive film, showing low corrosion rates and high impedance. However, NaHSO₃ disrupts this layer, increasing corrosion, reducing impedance, and causing pitting with Cr depletion and Cl/S enrichment. DFT reveals HSO₃⁻ adsorbs moderately likely decomposing to S, which binds strongly, outcompeting and blocking passivation.

Graphical abstract