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<p>The microscopic morphology of the polarized metal surface was characterized by open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization using the three-electrode system, and the corrosion resistance and corrosion characteristics of pure Fe, pure Cr, and pure Mo metals in different concentrations of NH<sub>4</sub>Cl solution were studied and analyzed. The results show that in NH<sub>4</sub>Cl solution environment, pure Fe, pure Cr, and pure Mo all show pitting corrosion with obvious passivation zones. Among them, pure Fe is the most susceptible to corrosion, and pure Cr and pure Mo exhibit higher corrosion resistance due to the presence of higher charge transfer impedance Rct values in their fitted equivalent circuits. Due to the self-passivation phenomenon and the existence of product film, the corrosion properties of these three metals did not simply increase with the increase in NH<sub>4</sub>Cl concentration, and their corrosion resistance was less affected by NH<sub>4</sub>Cl concentration.</p>

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Electrochemical Investigation on the Effect of NH4Cl Concentration on the Corrosion Behavior of Pure Fe, Pure Cr, and Pure Mo

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • Yang Li,
  • Jie Cheng,
  • Zidan Zhu,
  • Weijie Bao,
  • Lei Fan,
  • Xiaohao Cai,
  • Mei Wu

摘要

The microscopic morphology of the polarized metal surface was characterized by open circuit potential, electrochemical impedance spectroscopy, and potentiodynamic polarization using the three-electrode system, and the corrosion resistance and corrosion characteristics of pure Fe, pure Cr, and pure Mo metals in different concentrations of NH4Cl solution were studied and analyzed. The results show that in NH4Cl solution environment, pure Fe, pure Cr, and pure Mo all show pitting corrosion with obvious passivation zones. Among them, pure Fe is the most susceptible to corrosion, and pure Cr and pure Mo exhibit higher corrosion resistance due to the presence of higher charge transfer impedance Rct values in their fitted equivalent circuits. Due to the self-passivation phenomenon and the existence of product film, the corrosion properties of these three metals did not simply increase with the increase in NH4Cl concentration, and their corrosion resistance was less affected by NH4Cl concentration.