Abstract
A Zn-Ni coating is electrodeposited on the surface of Q235B steel and passivated via a trivalent chromium solution with silicate to greatly improve its corrosion resistance in a simulated concrete pore solution. The surface roughnesses of the zinc coating and Zn-Ni coating are approximately 0.457 and 0.332 μm, respectively. The surface of the passivated Zn-Ni coating is covered with metal oxides and hydroxides due to chemical reactions, which slightly increase the roughness. The thicknesses of the Zn coating, Zn-Ni coating and passivated Zn-Ni coating are all approximately 25 μm. The surface of the Zn-Ni alloy coating is composed of many compact nodular structures. After passivation, the passivated Zn-Ni alloy coating presents a net-shaped morphology. The passivated Zn-Ni alloy coating contains 76.9 Zn, 14.3 Ni, 6.3 Cr and 2.5% Si. After immersion in the simulated concrete pore solution for 9 days, the passivated Zn-Ni alloy coating has the lowest current density of 10.529 μA/cm2, indicating the best corrosion resistance. The corrosion products on the passivated Zn-Ni coating are denser and less porous than those on the surface of the Zn and ZnNi coatings.
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Tiejun, C., Yan, W., Jing, W. et al. Electrodeposition and Passivation of ZnNi Alloy Coating on Q235B Steel and its Corrosion Resistance Performance in Simulated Concrete Pore Solution. J. of Materi Eng and Perform (2025). https://doi.org/10.1007/s11665-025-11982-0
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DOI: https://doi.org/10.1007/s11665-025-11982-0