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<p>The anti-corrosion property of FeCoNi medium-entropy alloy (MEA) in simulated seawater under the influences of various Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> concentrations and direct current (DC) densities was systematically investigated through a series of measurements. The results indicate that the corrosion resistance of the MEA deteriorates with increasing S<sub>2</sub>O<sub>3</sub><sup>2−</sup> content, which is mainly reflected by an elevated i<sub>corr</sub>, a reduced R<sub>f</sub>, and enhanced susceptibility to pitting corrosion. S<sub>2</sub>O<sub>3</sub><sup>2−</sup> impairs the integrity and protective capability of surface passivation film, thereby facilitating the MEA corrosion. Upon the imposition of DC interference, abundant H⁺ ions are generated and adsorbed onto the surface film, which markedly degrades its protection, inducing the active corrosion of the MEA. Therefore, the combined action of DC and S<sub>2</sub>O<sub>3</sub><sup>2−</sup> severely reduces the corrosion resistance of the MEA, resulting in an aggravated corrosion level.</p>

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Coupled Corrosion Degradation Mechanism of FeCoNi Medium-Entropy Alloy Interfered with Direct Current in Simulated Seawater Containing Thiosulfate

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • M. Zhu,
  • Z. X. Ye,
  • Y. F. Yuan,
  • G. Y. Wei

摘要

The anti-corrosion property of FeCoNi medium-entropy alloy (MEA) in simulated seawater under the influences of various Na2S2O3 concentrations and direct current (DC) densities was systematically investigated through a series of measurements. The results indicate that the corrosion resistance of the MEA deteriorates with increasing S2O32− content, which is mainly reflected by an elevated icorr, a reduced Rf, and enhanced susceptibility to pitting corrosion. S2O32− impairs the integrity and protective capability of surface passivation film, thereby facilitating the MEA corrosion. Upon the imposition of DC interference, abundant H⁺ ions are generated and adsorbed onto the surface film, which markedly degrades its protection, inducing the active corrosion of the MEA. Therefore, the combined action of DC and S2O32− severely reduces the corrosion resistance of the MEA, resulting in an aggravated corrosion level.