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<p>Effect of pre-soaking in sulfide-containing solutions on the corrosion and cavitation erosion (CE) behaviors of nickel aluminum bronze (NAB) was investigated. Gravimetric measurement results indicated pre-soaking in sulfide-containing solutions remarkably raised the corrosion rate of the NAB, and the corrosion rate further increased as the pre-soaking time extended. Electrochemical results indicated that a protective film hardly formed on these pre-soaked samples, with the impedance value about an order of magnitude lower than that of the sample without pre-soaking. Moreover, thick but porous corrosion products formed on the pre-soaked NAB samples and created a crevice corrosion environment, triggering the occurrence of severe localized corrosion and the appearance of deep corrosion pits. The sample pre-soaked in 200 ppm sulfide-containing solution underwent less severe localized corrosion and possessed a higher film impedance, thus it exhibited a lower corrosion rate than the other pre-soaked samples. The CE test results indicated that all the pre-soaked samples exhibited higher CE rate than the sample without pre-soaking. The localized corrosion damage and deep corrosion pits induced by pre-soaking increased surface roughness, degraded mechanical property, and thereby promoted material detachment and accelerated CE degradation. The sample pre-soaked in 200 ppm sulfide-containing solution exhibited a relatively lower CE rate than the other pre-soaked samples, because the initial copper sulfide film could act as a barrier against the mechanical impact, and the less severe localized corrosion damage prevented remarkable CE mass loss.</p>

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Effect of Pre-soaking in Sulfide-Containing Solutions on the Corrosion and Cavitation Erosion Performance of Nickel Aluminum Bronze

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Q. Liu,
  • C. L. Peng,
  • X. Y. Wang,
  • Q. N. Song,
  • Z. T. Jin,
  • N. Xu,
  • Y. F. Bao,
  • Y. F. Jiang,
  • Y. Gao,
  • Y. T. Zhang

摘要

Effect of pre-soaking in sulfide-containing solutions on the corrosion and cavitation erosion (CE) behaviors of nickel aluminum bronze (NAB) was investigated. Gravimetric measurement results indicated pre-soaking in sulfide-containing solutions remarkably raised the corrosion rate of the NAB, and the corrosion rate further increased as the pre-soaking time extended. Electrochemical results indicated that a protective film hardly formed on these pre-soaked samples, with the impedance value about an order of magnitude lower than that of the sample without pre-soaking. Moreover, thick but porous corrosion products formed on the pre-soaked NAB samples and created a crevice corrosion environment, triggering the occurrence of severe localized corrosion and the appearance of deep corrosion pits. The sample pre-soaked in 200 ppm sulfide-containing solution underwent less severe localized corrosion and possessed a higher film impedance, thus it exhibited a lower corrosion rate than the other pre-soaked samples. The CE test results indicated that all the pre-soaked samples exhibited higher CE rate than the sample without pre-soaking. The localized corrosion damage and deep corrosion pits induced by pre-soaking increased surface roughness, degraded mechanical property, and thereby promoted material detachment and accelerated CE degradation. The sample pre-soaked in 200 ppm sulfide-containing solution exhibited a relatively lower CE rate than the other pre-soaked samples, because the initial copper sulfide film could act as a barrier against the mechanical impact, and the less severe localized corrosion damage prevented remarkable CE mass loss.