Abstract
The Zn-Al-CO32− hydrotalcite (HT) conversion film was developed on hot-dip galvanized steel (HDG), ZnAl coated steel (ZA), and Zn-Al-Mg coated steel (ZAM) substrates by “in situ” growth process for Al3+/Zn2+ ratio of 5/3 at pH 12. The characteristics of all the ZnAl HT film-coated samples before and after exposure to 0.1 M NaCl for 24 h were investigated by means of Fourier-transform infrared (FT-IR), X-Ray Diffraction (XRD), electron microscopy/energy dispersive X-ray spectroscopy SEM/EDS, and X-ray photoelectron spectroscopy (XPS). The corrosion properties of all the samples were studied by open circuit potential measurements (OCP), polarization curves, and electrochemical impedance spectroscopy (EIS). The electrochemical tests indicated that the HT film-coated can significantly restrain the corrosion of the HDG, ZA, and ZAM substrates but this efficiency was depending on the alloying compounds of the sacrificial layer. The inhibitive effect of HT film-coated on all the corrosion substrates was discussed in detail.
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