Polymer films formed on steel with water-based coating binders often have lower impedance than their solvent-borne counterparts. Additions of other components, for ease of processing, lower cost, and other additional functionalities, make their impedance even lower. The lower impedance, in connection with high water permeability and ion conductivity, indicates the proneness of a coating to blister and delaminate from a substrate. As an effort to reduce the number of and eliminate these defects from a polyvinylidene chloride (PVDC) primer coating, a systematic study with electrochemical impedance spectroscopy (EIS) was conducted on films formed with incremental components starting from only a binder resin to a formulated coating. The binder resin properties most strongly determined the inherent/initial impedance of the primer coating. However, due to the strong interactions between binders, fillers, solvents, and additives, the final impedance of the primer coating, after immersed in electrolyte, was determined by its formulation and application conditions.

Subject
Films, Primers, Electrochemical impedance spectroscopy, Barriers, Coating performance, Water, Coatings, Moduli, Impedance, Surfactants, Capacitance, Immersion, Electrical resistance
Keywords:
PVDC, water-based, primer, EIS, corrosion, coating, water barrier
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2013
Association for Materials Protection and Performance (AMPP)
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