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<p>In the electroplating process, the zinc-nickel coating may cause hydrogen embrittlement of the base steel. It is essential to incorporate a heat-treatment step for hydrogen removal in the fabrication process. To systematically explore the issue, this research employed SEM to analyze the surface morphology of coatings, IR and XPS to characterize compositional variations and electrochemical tests to quantify the decline in corrosion resistance of hexavalent chromium-Cr(VI) and trivalent chromium-Cr(III) zinc-nickel coatings. Results revealed that microcracks, measuring approximately 2&#xa0;μm in length, contribute more significantly to the degradation of corrosion resistance. The observation clarifies the distinct effects of heat treatment on coatings with different passivation methods. For zinc-nickel coatings that require heat treatment to remove hydrogen, the ability of trivalent passivation to maintain corrosion resistance is significantly better than that of hexavalent passivation.</p> Graphical Abstract

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Effect of Heat Treatment on the Corrosion Resistance of Electroplated Zinc-Nickel Coatings

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Pengxiang Jia,
  • Fei Long,
  • Surong Hu,
  • Jianhua Liu,
  • Zuoyan Ye,
  • Dongxing Du

摘要

In the electroplating process, the zinc-nickel coating may cause hydrogen embrittlement of the base steel. It is essential to incorporate a heat-treatment step for hydrogen removal in the fabrication process. To systematically explore the issue, this research employed SEM to analyze the surface morphology of coatings, IR and XPS to characterize compositional variations and electrochemical tests to quantify the decline in corrosion resistance of hexavalent chromium-Cr(VI) and trivalent chromium-Cr(III) zinc-nickel coatings. Results revealed that microcracks, measuring approximately 2 μm in length, contribute more significantly to the degradation of corrosion resistance. The observation clarifies the distinct effects of heat treatment on coatings with different passivation methods. For zinc-nickel coatings that require heat treatment to remove hydrogen, the ability of trivalent passivation to maintain corrosion resistance is significantly better than that of hexavalent passivation.

Graphical Abstract