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Relating Changes in Electrochemical Properties to Barrier Property Changes of an Organic Coating System

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Coating systems are used in a wide variety of environments, including seawater immersion and exposure to the atmosphere, as a method for preventing corrosion. A coating system refers to the layers of coatings that are applied over one another to form a structure that performs multiple functions that cannot be provided by a single coating. For example, the initial layer of the system may consist of a surface pretreatment that thickens the oxide film of the aircraft skin material and aids in adhesion of the base coating to the substrate.

Product Number: 51323-19314-SG
Author: Steven A. Policastro, Erick Iezzi, Attilio Arcari, Rachel M. Anderson, Carlos M. Hangarter
Publication Date: 2023
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Electrochemical impedance spectroscopy (EIS) has frequently been used to provide a means to nondestructively evaluate coatings. Equivalent circuit modeling can then be used to interpret the data. Several equivalent circuit models were used to analyze EIS data obtained from a commercial aircraft coating system exposed to laboratory environmental stressors to mimic in-service environments. Equivalent circuit parameter values were linked to outcomes of physics-based models of the resistivities and dielectric constants of the organic polymers making up the coating system. The fits to the measured EIS data from the equivalent circuit models were compared in how closely they matched the measured data. The physics-based input to the equivalent circuit modeling provided insight into the deterioration of the coating system in response to in-service environmental exposures.

Electrochemical impedance spectroscopy (EIS) has frequently been used to provide a means to nondestructively evaluate coatings. Equivalent circuit modeling can then be used to interpret the data. Several equivalent circuit models were used to analyze EIS data obtained from a commercial aircraft coating system exposed to laboratory environmental stressors to mimic in-service environments. Equivalent circuit parameter values were linked to outcomes of physics-based models of the resistivities and dielectric constants of the organic polymers making up the coating system. The fits to the measured EIS data from the equivalent circuit models were compared in how closely they matched the measured data. The physics-based input to the equivalent circuit modeling provided insight into the deterioration of the coating system in response to in-service environmental exposures.

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