Graphene/epoxy composite coatings are prepared through dispersing graphene in waterborne epoxy coatings to investigate the CO2 corrosion behavior in a high chloride environment. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) are used to characterize the composite coatings. The corrosion protection performance is studied by electrochemical impedance spectroscopy (EIS) and by measurement of the polarization curve. Results show that the addition of graphene improved the anti-corrosion properties of the composite coatings. The corrosion potential (Eo) of the 0.5 %wt graphene/epoxy composite coating (Eo = −644.78 mV) was more positive than that of the epoxy coating (Eo = −695.78 mV). The anodic reaction was retarded owing to graphene distributed inside the composite coating that impeded the diffusion of iron ions, while the cathodic reactions were much less affected.

Subject
Coating performance, Marine environments, Coatings, Sodium chloride, Polarization curves, Epoxy coatings, Sodium chloride solution, Composites, Steel, Corrosion protection, Epoxies, Chlorides, Oil
Keywords:
epoxy coating, graphene, CO2 corrosion, high chloride
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2019
Association for Materials Protection and Performance (AMPP)
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