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<p>In this work, the impact of Cr addition on the corrosion behavior of FeCoNi medium-entropy alloy (MEA) in 10 wt.% NH<sub>4</sub>Cl medium was systematically explored. The results demonstrate that compared with the MEA, CoCrFeNi high-entropy alloy (HEA) exhibits lower passive current density (26&#xa0;μA&#xa0;cm<sup>−2</sup>) and higher pitting potential (0.213&#xa0;V), indicating superior corrosion resistance. The discrepancy in anti-corrosion property between the two alloys is largely attributable to microstructure and passivation film performance. Adding Cr refines the grain size of the alloy and forms protective Cr-based compounds within the surface film and reduces the content of unstable iron oxides. These influencing factors synergistically contribute to the generation of a thicker, denser and more stable passivation film with fewer defects, thereby enhancing the corrosion resistance of the alloy and greatly decreasing the pitting quantity.</p>

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Investigation of Improved Anti-corrosion Performance of FeCoNi Medium-Entropy Alloy by Adding Cr in Weakly Acidic Environment

  • 期刊论文

  • 发表日期：

    2026年4月28日

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  • M. Zhu,
  • K. L. Lou,
  • J. T. Zhang,
  • Y. F. Yuan,
  • G. Y. Wei

摘要

In this work, the impact of Cr addition on the corrosion behavior of FeCoNi medium-entropy alloy (MEA) in 10 wt.% NH4Cl medium was systematically explored. The results demonstrate that compared with the MEA, CoCrFeNi high-entropy alloy (HEA) exhibits lower passive current density (26 μA cm−2) and higher pitting potential (0.213 V), indicating superior corrosion resistance. The discrepancy in anti-corrosion property between the two alloys is largely attributable to microstructure and passivation film performance. Adding Cr refines the grain size of the alloy and forms protective Cr-based compounds within the surface film and reduces the content of unstable iron oxides. These influencing factors synergistically contribute to the generation of a thicker, denser and more stable passivation film with fewer defects, thereby enhancing the corrosion resistance of the alloy and greatly decreasing the pitting quantity.