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[Objective] To investigate the effect of a novel chromium-free passivation solution on the surface properties and corrosion resistance of Zn-Al-Mg alloy coated steel. [Method] Characterization methods including scanning electron microscopy (SEM)， white light interferometry microscope(WLIM)， electron probe microanalysis (EPMA)， glow discharge spectroscopy (GDS)， and X-ray photoelectron spectroscopy (XPS) were used to analyze the surface morphology， elemental distribution， and chemical composition of the plates before and after passivation. Electrochemical performance was evaluated via Tafel polarization curves and electrochemical impedance spectroscopy (EIS) measurements. The corrosion resistance of the flat surface and edges was examined through neutral salt spray test and cyclic salt spray test. [Result] The chromium-free passivation film is an organic film formed by the crosslinking of silane and resin， and the surface of the passivated plate becomes smoother. Electrochemical test results show that the corrosion current density of the passivated plate decreases from 6.70 μA/cm2 to 3.08 μA/cm2， with a resistance of 4346 Ω·cm2. In the salt spray tests， the amount of red rust formation on the surface of the passivated plate is significantly less than that of the unpassivated plate， indicating remarkably improved corrosion resistance， while there is no significant change in the corrosion resistance of the cut edges. [Conclusion] This novel chromium-free passivation solution can effectively enhance the surface properties and corrosion resistance of ZM plates.
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Basic Information:
China Classification Code:TG174.4
Citation Information:
[1]Shaokang Hu,Min Li,Rong Shao ,et al.Effect of a novel chromium-free passivation solution on corrosion resistance of hot-dip Zn-Al-Mg alloy coated steel[J].Electroplating & Finishing().
2026-08-21
2026-08-21
2026-08-21