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<p>This work investigated the influence of different NH<sub>4</sub>Cl concentrations (0, 10, 50, 100&#xa0;mg/L) on the corrosion behavior of B30 Cu–Ni alloy in simulated seawater by various tests. The results show that as NH<sub>4</sub>Cl concentration increases, the passivation region shranks, i<sub>p</sub> increases, E<sub>p</sub> decreases and the defect density inside the surface passivation film rises, which demonstrate that the existence of NH<sub>4</sub><sup>+</sup> weakens the corrosion resistance of the alloy. Furthermore, when the NH<sub>4</sub><sup>+</sup> concentration increases to 50&#xa0;mg/L, a clear transition zone appears, as well as the number and size of pitting increase, indicating that the passivity of B30 alloy is declined, and the pitting degree is heightened. The H<sup>+</sup> caused by hydrolysis of NH<sub>4</sub><sup>+</sup> promotes the passivation film disruption, and impairs its protective performance.</p>

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A Study on the Corrosion Resistance of B30 Cu–Ni Alloy in a Simulated Marine Environment Containing NH4+

  • 期刊论文

  • 发表日期：

    2025年3月18日

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  • S. T. Guo,
  • M. Zhu,
  • Y. F. Yuan,
  • S. Y. Guo

摘要

This work investigated the influence of different NH4Cl concentrations (0, 10, 50, 100 mg/L) on the corrosion behavior of B30 Cu–Ni alloy in simulated seawater by various tests. The results show that as NH4Cl concentration increases, the passivation region shranks, ip increases, Ep decreases and the defect density inside the surface passivation film rises, which demonstrate that the existence of NH4+ weakens the corrosion resistance of the alloy. Furthermore, when the NH4+ concentration increases to 50 mg/L, a clear transition zone appears, as well as the number and size of pitting increase, indicating that the passivity of B30 alloy is declined, and the pitting degree is heightened. The H+ caused by hydrolysis of NH4+ promotes the passivation film disruption, and impairs its protective performance.