Evaluating the Diffusion Coefficient of Different Epoxy Resins with EIS

The penetrability of coatings decides the anti-corrosion performance.Calculating the diffusion coefficient is useful for to evaluating the use life of the coating.The diffusion coefficient of different epoxy resins were evaluated by EIS.The curves of the resistance and capacitance of different epoxy resins vs immersion times were obtained. The results of analyses showed that the smaller the epoxide equivalent,is the better the anti-penetrability.