Study on the corrosion and wear resistance of g-C3N4@CeO2 modified GO composite waterborne epoxy resin coating

A graphitic carbon nitride-ceria modified graphene oxide (g-C 3 N 4 @CeO 2 @GO) composite waterborne epoxy coating was successfully prepared via a hydrothermal synthesis method, exhibiting excellent anti-corrosion and wear-resistant properties. The structure and morphology of the composite were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR). The corrosion protection performance and wear resistance of the composite coating were systematically evaluated through electrochemical impedance spectroscopy (EIS), Tafel polarization curve measurements, and wear tests. The results indicated that the introduction of g-C 3 N 4 and CeO 2 effectively inhibited the stacking of GO nanosheets, leading to the formation of a dense physical barrier network. The impedance modulus of the composite coating in a 3.5 wt% NaCl solution reached 1.6×10 10 Ω·cm 2 . Moreover, the corrosion current density decreased by four orders of magnitude. After a full 21-day immersion period, the composite coating still maintained a high impedance value. Salt spray tests and additional wear resistance evaluations were also conducted. The enhanced performance of the composite coating is attributed to the synergistic effects among the inert barrier provided by g-C 3 N 4 , the corrosion inhibition function of CeO 2 , and the two-dimensional layered structure of GO. This study provides new insights for the development of high-performance waterborne anti-corrosion and wear-resistant coatings.