Abstract
Electrochemical impedance spectroscopy was used to investigate the behaviour of an epoxy water-based coating immersed in a solution of sodium chloride. The increase of the resistance, associated to the high-frequency part of the diagram ( R HF), with increasing immersion time was attributed to the occurrence of coalescence of the polymer particles in water-based film, accelerated by immersion in the electrolytic solution. It was shown that the capacitance ( C HF) variation with immersion time results from a plasticisation effect induced by water uptake and from the coalescence process. In addition, dielectric measurements revealed that the water molecules are bound with the polar groups of the polymer.
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