Interfacial Compatibility and Anticorrosion Performance of Epoxy Resin Coating Improved by Modified Graphene and Graphene Oxide

Epoxy (EP) coatings containing different mass fraction of modified graphene (G) and graphene oxide (GO) have been successfully prepared on the surface of cast irons. The anticorrosion performance of the coatings was studied by electrochemical polarization curve and electrochemical impedance spectroscopy in 3.5 wt% NaCl solution. The interfacial structure of the coatings was characterized by X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results indicate that both G and GO could improve the anticorrosion performance of EP coatings effectively and their best mass fraction are 0.25% for G and 0.50% for GO. Furthermore, the anticorrosion performance of G-EP composite coating is better than GO-EP composite coating at the same mass fraction. Compare to G, XPS and SEM results indicate that GO exhibits better interfacial compatibility in EP. Finally, the inhibitive mechanism of G and GO was discussed based on the obtained results.