Influence of corrosion inhibitors on aging mechanism of epoxy resin coatings for copper 62 alloy in simulated marine environment

Abstract Aiming at the shortcoming that when applied to nonferrous copper 62 surfaces, epoxy coatings are prone to aging in marine environments. In order to extend the service life of copper 62 coatings in marine environments, methods of screening the corrosion inhibitor commonly used in copper 62 alloys and adding it to epoxy organic coatings have been investigated. Tafel polarization test and electrochemical impedance spectroscopy (EIS) were used to study the corrosion inhibition effect of different corrosion inhibitors on copper 62 alloy in simulated marine environment, and the influence of MBI on the damage process and water transport of epoxy coatings was studied by EIS. The results show that 2 mercaptobenzothiazole (MBT) has good corrosion inhibition on copper 62 alloy in marine environment. When the total mass fraction is 0.5 wt%, the corrosion suppression can reach 96.4 %. When MBT is added to the epoxy organic coating at 0.5 wt%, the diffusion coefficient of the coating is as low as 8.35 × 10 −11 cm 2 s −1 , and the failure time of the coating is extended to 1824 h. It has been shown that the addition of MBT can effectively improve the service life of copper 62 alloy/epoxy coatings in marine environments.