Organic coating capacitance measurement by EIS: ideal and actual trends

Development and Characterization of Anticorrosion and Antifriction Properties for High Performance Polyurethane/Graphene Composite Coatings

“…The coating capacitance extracted from EIS data by using equivalent electric circuit fitting is used to determine the lifetime of organic coatings in aqueous media. By studying the variation of coating capacitance, it is possible to evaluate the water uptake phenomenon because the presence of even a very small amount of water can modify the dielectric constant of the polymer [51,52]. The presence of water in the coating can activate the corrosion process or lead to loss of adhesion and blistering [52].…”

“…By studying the variation of coating capacitance, it is possible to evaluate the water uptake phenomenon because the presence of even a very small amount of water can modify the dielectric constant of the polymer [51,52]. The presence of water in the coating can activate the corrosion process or lead to loss of adhesion and blistering [52]. Therefore, the evolution of coating capacitance is among the important parameters for characterizing the protective properties of organic coatings.…”

The influence of a Zr-based conversion treatment on interfacial bonding strength and stability of epoxy coated carbon steel

“…This technique works based on the application of a small continuous perturbed electrical voltage and measures current response without changing the steady state condition of the system. EIS is very useful because it is a non-destructive method which can provide several system parameters such as organic coating resistance, capacitance and charge transfer reactions at the metal/polymer interface upon coating degradation [46,47].…”

Use of Electrochemical Impedance Spectroscopy (EIS) for the Evaluation of Electrocoatings Performances

“…It is however also possible to follow the evolution of the delamination process with EIS measurements on scratched samples [21,22,[42][43][44][45]. In that case, the evaluation of the delaminated area is based on the determination of the wet area where the corrosion reactions take place.…”