Laboratory prepared samples of four types of epoxy coatings on 1010 carbon steel were immersed in aerated ASTM sea water for up to 4 years. Quantitative visual coating degradation via blistering was correlated to coating and corrosion parameters as determined by electrochemical impedance spectroscopy (EIS) modeling and measurements. The data indicate EIS parameters allow identification of subfilm disbondment long before surface evidence of coating deterioration is apparent. An equivalent circuit model suggests disbondment areas as small as 0.0001% can be measured.

Subject
Circuits, Primers, Electrochemical impedance spectroscopy, Water, Coatings, Impedance, Pores, Capacitance, Coating thickness, Epoxy coatings, Epoxies, Delamination, Blistering
Keywords:
epoxy coatings, electrochemical methods, electrochemical impedance spectroscopy, non destructive testing, artificial sea water, coating disbondment
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1990
Association for Materials Protection and Performance (AMPP)
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