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Characterizing surface coatings on carbon steel by AC impedance degradation of an alkyd primer coating and growth of elevated-temperature oxides
AuthorSenkevich, John Joseph
AdvisorJones, Denny A.
Mining and Metallurgical Engineering
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AC impedance was used to evaluate the degradation of an alkyd primer paint coating in 3% NaCl solution and the oxidation oi1008 carbon steel in air at SOO^C AC impedance is non-destructive and relatively rapid compared to the related method of electrochemical impedance spectroscopy (EIS) AC impedance possesses contact resistance as opposed to solution resistance for EIS. The results indicate AC impedance measures the amount of water absorbed into the coating AC impedance measures resistance and capacitance as related to the oxide thickness and consequently has the potential for implementation as a non-destructive in situ method to measure long-term surface oxidation and coating degradation In terms of resistance measurements, AC impedance detected only hematite because of its high electrical resistivity compared to magnetite It could not differentiate between hematite and magnetite in relation to capacitance measurements because of their similar dielectric constants.
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