A study on effects of viscoelastic properties on protective performance of epoxy coatings using EIS

The results showed a correlation between protective properties and viscoelastic behavior of coatings. It was found that a sample with higher percentage of cycloaliphatic hardener has higher elastic modulus (1275 MPa) and a sample with higher percentage of polyether poly amine hardener has the lower elastic modulus (465 MPa). Additionally It was found that a sample with excellent initial protective properties (|Z| = 1010 Ω cm2), higher elastic modulus and low initial water permeability (0.308 g/m2hr) may quickly fail because of the adhesion failure after wet cycles.