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<p>The influence of Mn and Cr addition on corrosion behavior of FeCoNi medium-entropy alloy (MEA) in 3.5% NaCl solution with SO<sub>2</sub> pollution was comprehensively investigated through electrochemical measurement, wet–dry cyclic corrosion test and surface analysis technology. Relevant results indicate that compared with the MEA, CoCrFeMnNi high-entropy alloy (HEA) possesses lower passive current density (i<sub>pass</sub>), slower corrosion rate and higher pitting potential (E<sub><i>p</i></sub>), revealing a better resistance capacity against corrosion. The difference in anti-corrosion resistance of the two alloys is mainly attributed to their microstructure, chemical composition and passive film. The smaller grain size of the HEA is beneficial to form a more protective passive film, effectively improving its anti-corrosion performance. Upon the Mn addition, manganese oxides with high electrochemical activity are not conducive to producing compact and stable passivation film, accelerating corrosion occurrence. Cr addition enhances the film protection against corrosion, which effectively inhibits the electrochemical reaction. Based on the comparative study results, the promoting effect of Cr element on anti-corrosion property of the HEA is remarkably greater than the negative effect of Mn element, thereby inhibiting pitting nucleation of CoCrFeMnNi HEA.</p>

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Corrosion Resistance of FeCoNi Medium-Entropy Alloy with Cr and Mn Additions in Simulated SO2-Contaminated Seawater

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Q. H. Ni,
  • M. Zhu,
  • Y. F. Yuan,
  • S. Y. Guo

摘要

The influence of Mn and Cr addition on corrosion behavior of FeCoNi medium-entropy alloy (MEA) in 3.5% NaCl solution with SO2 pollution was comprehensively investigated through electrochemical measurement, wet–dry cyclic corrosion test and surface analysis technology. Relevant results indicate that compared with the MEA, CoCrFeMnNi high-entropy alloy (HEA) possesses lower passive current density (ipass), slower corrosion rate and higher pitting potential (Ep), revealing a better resistance capacity against corrosion. The difference in anti-corrosion resistance of the two alloys is mainly attributed to their microstructure, chemical composition and passive film. The smaller grain size of the HEA is beneficial to form a more protective passive film, effectively improving its anti-corrosion performance. Upon the Mn addition, manganese oxides with high electrochemical activity are not conducive to producing compact and stable passivation film, accelerating corrosion occurrence. Cr addition enhances the film protection against corrosion, which effectively inhibits the electrochemical reaction. Based on the comparative study results, the promoting effect of Cr element on anti-corrosion property of the HEA is remarkably greater than the negative effect of Mn element, thereby inhibiting pitting nucleation of CoCrFeMnNi HEA.