Abstract
The degradation process and electrochemical characteristics of an environment-friendly solvent-free epoxy coating in 3.5 % NaCl solution was investigated by using electrochemical impedance spectroscopic (EIS) studies. Combined with open circuit potential (OCP), adhesion tests, Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM) methods, the failure mechanism of the coating was analyzed. The results show that the failure of the coating is mainly caused by physical processes due to many nanoscale defects providing channels for the diffusion of corrosive media. The low-frequency impedance (|Z|0.01Hz) decreases to about 1 × 107 Ω cm2, demonstrating a poor protection performance of the coating, manifested by the coating adhesion decreasing about 50 %–60 % and corrosion products observed on the substrate by SEM. The mathematical formula proposed by Bierwagen is suitable for predicting the service life of the solvent-free epoxy coating combined with a suitable failure criterion.
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