To enhance the corrosion resistance of the traditional epoxy resin coatings, a composite coating with different graphene content was prepared by combining the traditional coating with the modified graphene. The section morphology, contact angle, thermal properties and tribological properties were characterized before and after adding different contents of graphene coating by using scanning electron microscopy (SEM), contact angle measurement, micro infrared spectrometer, thermogravimetric analyzer, multifunctional surface tester. The electrochemical behavior of the coating immersed in 3.5% NaCl solution was studied by using electrochemical impedance spectroscopy (EIS) and polarization curve. The salt fog resistance of the coating with different contents of graphene was tested using the neutral salt spray. When the graphene content is 1%, the coating has the best properties. Compared with the unmodified graphene coating, the contact angle of the modified graphene coating increases by 5 degrees, and the hydrophobic property of the modified graphene coating is improved. The average friction coefficient decreases from 0.28 to 0.08, and the wear resistance is improved. The corrosion resistance of positive shift of self-corrosion potential is significantly enhanced with the decrease of self-corrosion current. In salt spray test for 1 800 h, no obvious corrosion occurs in coating sample with addition of 1% graphene.
