Corrosion Resistance of Epoxy Resin Paint Modified by Hybrid Silica Sol in Simulated Oilfield Produced Water

Using organic-inorganic hybrid silica sol as modifier to prepare the modified epoxy resin paint, and the corrosion resistance of epoxy resin paint in simulated oilfield produced water was studied by electrochemical impedance spectroscopy test (EIS) and autoclave test, with scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) as ancillary analyses. The results showed that when the paint coat was soaked for 7 days at different temperatures, the coating resistance could reach 10(7)-10(8) Omega. When the temperature is 50 degrees C, the maximum resistance of coating is about 8.073 x 10(7) X, and the corrosion resistance property is the best. In addition, when the resin paint is soaked in the condition of T = 100 degrees C and P (CO2) = 2 MPa with high-temperature autoclave for two days, the surface of resin paint has no foaming and shedding phenomenon. The SEM and EDS analysis show that the corrosion resistance of the coating in simulated oilfield produced water is improved significantly.