Corrosion behavior of reduced-graphene-oxide-modified epoxy coatings on N80 Steel in 10.0 wt% NaCl solution

Abstract

This study is examined the effects of modified epoxy (EP) coatings with various contents of reduced graphene oxide (RGO) in oil and gas production environments with high-temperature and high-salinity on the long-term service performance of N80 steel. The fracture surfaces of RGO-modified EP coatings were characterized by scanning electron microscopy (SEM). The corrosion resistance of the coatings after immersion in 10.0 wt% NaCl solution for 60 days at 50°C was characterized via electrochemical impedance spectroscopy (EIS) and using potentiodynamic polarization curves. After immersion in the 10.0 wt% NaCl solution for 60 days, the EP composite coatings with 1.0 wt% RGO nanosheets still showed improved strength and toughness compared with the EP coatings, with pores that were two to three times smaller and two orders of magnitude less numerous than the neat EP coatings, which resulted in excellent corrosion resistance.