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<p>Zn-Sn alloy coatings are attractive for protecting mild steel due to the barrier effect of Sn and the sacrificial nature of Zn. This study explores the use of sodium citrate as a complexing agent to enhance the performance of Zn-Sn electrodeposited coatings. Coatings were deposited on mild steel using electrolytes with varying citrate concentrations (bath 1 to 4), and analyzed using cyclic voltammetry (CV), scanning electron microscopy (SEM), Tafel polarization and electrochemical impedance spectroscopy (EIS). The results show that 0.1 M citrate significantly improved the surface morphology, leading to more uniform coatings with fewer visible defects. Electrochemical tests revealed a 70% decrease in corrosion current density, and EIS confirmed enhanced barrier properties, which may be attributed to the presence of oxide phases formed on the coating surface. These findings highlight the effectiveness of citrate in producing corrosion-resistant Zn-Sn coatings suitable for chloride-rich environments.</p> Graphical abstract <p></p>

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From bath to barrier: the role of citrate in engineering corrosion-resistant Zn-Sn alloy coatings

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Bouderbala Ibrahim Yaacoub,
  • Herbadji Abdelmadjid,
  • Benidir Sofiane,
  • Madani Ahmed,
  • Sobhi Nour El Houda,
  • Aitbara Adel,
  • Rabhi Selma,
  • Khellaf Noureddine

摘要

Zn-Sn alloy coatings are attractive for protecting mild steel due to the barrier effect of Sn and the sacrificial nature of Zn. This study explores the use of sodium citrate as a complexing agent to enhance the performance of Zn-Sn electrodeposited coatings. Coatings were deposited on mild steel using electrolytes with varying citrate concentrations (bath 1 to 4), and analyzed using cyclic voltammetry (CV), scanning electron microscopy (SEM), Tafel polarization and electrochemical impedance spectroscopy (EIS). The results show that 0.1 M citrate significantly improved the surface morphology, leading to more uniform coatings with fewer visible defects. Electrochemical tests revealed a 70% decrease in corrosion current density, and EIS confirmed enhanced barrier properties, which may be attributed to the presence of oxide phases formed on the coating surface. These findings highlight the effectiveness of citrate in producing corrosion-resistant Zn-Sn coatings suitable for chloride-rich environments.

Graphical abstract