Abstract
A Ti containing conversion film on hot-dip galvanized steel was prepared by chemical conversion in titanium sulfate solution. The surface morphology, chemical composition and ingredients of the film were characterized by means of SEM, EDS and XPS. Then the corrosion resistance of the galvanized steel coated with Ti containing conversion film was examined by NSS test, electrochemical polarization and electrochemical impedance spectroscopy(EIS). The results show that the Ti containing conversion film gradually thickens and the Ti content of the film increases with the increasing time in the solution; the film mainly consists of Ti(OH)4/TiO2and Zn(OH)2/ZnO. In comparison with the blank galvanized steel, the corrosion current density decreases, the polarization resistance and the electrochemical impedance increase significantly for the galvanized steel with Ti containing conversion film on top. The Ti containing conversion films enhance the corrosion resistance significantly, among them a film prepared in the solution for 10 min exhibits the highest corrosion resistance.
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