Synthesis of h-BN modified GO to improve the corrosion resistance of the water-borne epoxy coating for hot-dip galvanized steel

Abstract

Abstract Hexagonal boron nitride (h-BN) was adopted to modify graphene oxide (GO) by silane agent chemically and the h-BN modified GO (BmGO) was used to improve the corrosion resistance of water-borne epoxy coating on hot-dip galvanized steel. It was found the dispersion of BmGO in ethanol was improved because of the increase of the crystal spacing of GO. The corrosion potential of coating containing BmGO (BmGO-EP) shifted from -0.96 V to -0.85 V and the corrosion current density was one order of magnetic higher than that of pour epoxy coating. Moreover, EIS results show that BmGO-EP performed the maximum |Z|f=0.01 and phased angle. Another time constant appeared after immersion in corrosive solution for 72 h. The improved corrosion resistance was because of the excellent dispersity of BmGO, which benefited modifying surface defects and extending the diffusion path of corrosive ions.