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<p>This work investigated the influence of NH<sub>4</sub>HSO<sub>4</sub> concentration on the corrosion behavior of CoCrNi medium-entropy alloy (MEA) in ammonium sulfate mother liquor. The results suggest that the addition of NH<sub>4</sub>HSO<sub>4</sub> decreases the corrosion resistance of the MEA. With increasing NH<sub>4</sub>HSO<sub>4</sub> concentration, the pits generated on the alloy significantly increase. Under the collective destruction caused by H<sup>+</sup> ions, H atoms and Cl<sup>-</sup> ions, the thickness and integrity of passivation film decrease, causing a deterioration in its protective performance. Meanwhile, adding NH<sub>4</sub>HSO<sub>4</sub> significantly alters the electronic structure of surface film, weakens its stability and results in serious damage to the corrosion resistance of the MEA.</p>

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Influence of Ammonium Bisulfate on Anti-corrosion Performance of CoCrNi MEA in Simulated Ammonium Sulfate Mother Liquor

  • 期刊论文

  • 发表日期：

    2025年3月8日

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  • K. L. Lou,
  • B. Zhang,
  • M. Zhu,
  • Y. F. Yuan,
  • S. Y. Guo

摘要

This work investigated the influence of NH4HSO4 concentration on the corrosion behavior of CoCrNi medium-entropy alloy (MEA) in ammonium sulfate mother liquor. The results suggest that the addition of NH4HSO4 decreases the corrosion resistance of the MEA. With increasing NH4HSO4 concentration, the pits generated on the alloy significantly increase. Under the collective destruction caused by H+ ions, H atoms and Cl- ions, the thickness and integrity of passivation film decrease, causing a deterioration in its protective performance. Meanwhile, adding NH4HSO4 significantly alters the electronic structure of surface film, weakens its stability and results in serious damage to the corrosion resistance of the MEA.