Effect of Dopamine Modified GO on Properties of Epoxy Zinc-Rich Coatings

DA-rGO nano composites were obtained by the reduction and modification of graphene oxide (GO) with dopamine (DA), and were added into epoxy zinc-rich coating to prepare a new DA-rGO/epoxy zinc-rich anticorrosive coating. The DA-rGO nano composites were characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The physical properties including impact resistance, hardness, adhesion of the coating as well as it electrochemical properties and salt-spray corrosion resistance were tested. The test results show that when the dosage of DA-rGO was 1%, the impact resistance, hardness and other physical properties of the coating reached the best, meanwhile the coating had the lowest corrosion current density and the highest corrosion potential, showing best corrosion resistance.