Abstract
Abstract The scanning vibrating electrode technique (SVET) was used to study the influence that accelerating corrosion, by attaching remote stainless steel cathodes, has on the corrosion mechanism occurring at exposed cut edges of 0.7-mm gauge organically coated galvanized steels (OCS). Galvanized steel samples were coated with organic coating layers (200 μm polyvinyl chloride [PVC] on one side and between 5 μm and 36 μm polyester on the other) to produce model cut edges with varying degrees of coating asymmetry. Under free corrosion conditions in 5% aqueous sodium chloride (NaCl) in the absence of polarization, such materials exhibited an asymmetric corrosion profile, which likely was caused by the establishment of differential aeration. Anodic activity was localized proximal to the thicker PVC coating with cathodic activity on the steel and zinc proximal to the thinner polyester coating. SVET testing and electrical impedance spectroscopic (EIS) measurements showed that there was no activity occurring vi...
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