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<p>The objective of this study was to evaluate the influence of nickel content in zinc-nickel coatings on hydrogen retention and permeability in low-carbon steel. A modified electrochemical desorption method was employed to quantify hydrogen adsorption on the coatings, and the hydrogen permeation behavior was analyzed using a dual-cell electrochemical setup. The morphology and composition of the coatings were characterized by scanning electron microscopy and X-ray diffraction. The results indicated that increasing nickel content in the coating refined the grain structure and enhanced corrosion resistance. A significant decrease in hydrogen permeability was observed for the intermediate composition of 17.27&#xa0;wt% Ni, suggesting a synergistic effect that increased irreversible hydrogen traps. Moreover, a gradual decrease in the apparent diffusivity of hydrogen was observed as the nickel content within the coating increased. This suggests the development of more resistant barriers to the diffusion process. These findings highlight the importance of optimizing alloy composition to improve resistance to hydrogen embrittlement in steel substrates.</p> Graphical Abstract <p></p>

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Evaluation of hydrogen adsorption on Zn–Ni alloy coating by electrochemical desorption technique and its permeability on AISI 1020 steel

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • J. R. Jovelino Torres,
  • G. de Carvalho Lira,
  • E. O. Vilar

摘要

The objective of this study was to evaluate the influence of nickel content in zinc-nickel coatings on hydrogen retention and permeability in low-carbon steel. A modified electrochemical desorption method was employed to quantify hydrogen adsorption on the coatings, and the hydrogen permeation behavior was analyzed using a dual-cell electrochemical setup. The morphology and composition of the coatings were characterized by scanning electron microscopy and X-ray diffraction. The results indicated that increasing nickel content in the coating refined the grain structure and enhanced corrosion resistance. A significant decrease in hydrogen permeability was observed for the intermediate composition of 17.27 wt% Ni, suggesting a synergistic effect that increased irreversible hydrogen traps. Moreover, a gradual decrease in the apparent diffusivity of hydrogen was observed as the nickel content within the coating increased. This suggests the development of more resistant barriers to the diffusion process. These findings highlight the importance of optimizing alloy composition to improve resistance to hydrogen embrittlement in steel substrates.

Graphical Abstract