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<p>In this work, the corrosion behavior of CoCrNi medium entropy alloy (MEA) and CoCrFeNi high entropy alloy (HEA) in 8&#xa0;wt.% NH<sub>4</sub>Cl solution was compared systematically. The results demonstrate that the MEA exhibits higher corrosion resistance than the HEA, as evidenced by lower corrosion kinetic parameters values, and a more protective and compact passivation film of the MEA. Adding Fe decreases pitting potential (<i>E</i><sub>p</sub>), and promotes the occurrence of stable and metastable pitting. Furthermore, the grain size and passive film are the significant factors causing the difference in corrosion resistance of the MEA and HEA. The incorporation of Fe alters the grain size of the MEA and the composition of passive film, thereby weakening its anti-corrosion performance. Selective dissolution of elements induces the occurrence of pit for the MEA and HEA.</p>

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Influence of Adding Fe on Corrosion Behavior of CoCrNi Medium Entropy Alloy in Ammonium Chloride Solution

  • 期刊论文

  • 发表日期：

    2025年2月19日

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

摘要

In this work, the corrosion behavior of CoCrNi medium entropy alloy (MEA) and CoCrFeNi high entropy alloy (HEA) in 8 wt.% NH4Cl solution was compared systematically. The results demonstrate that the MEA exhibits higher corrosion resistance than the HEA, as evidenced by lower corrosion kinetic parameters values, and a more protective and compact passivation film of the MEA. Adding Fe decreases pitting potential (Ep), and promotes the occurrence of stable and metastable pitting. Furthermore, the grain size and passive film are the significant factors causing the difference in corrosion resistance of the MEA and HEA. The incorporation of Fe alters the grain size of the MEA and the composition of passive film, thereby weakening its anti-corrosion performance. Selective dissolution of elements induces the occurrence of pit for the MEA and HEA.