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Abstract
Abstract The aim of this study is to investigate the effect of clay nanosheets on the galvanic protection behavior of zinc in scribed areas of polymer zinc-rich coating. The scribed area is a simulation of damage in the coating in such a way that steel gets in contact with a corrosive solution and sacrificial behavior of zinc becomes important. Ultrasonic was applied to disperse nanosheets of clay in the epoxy resin. The clay content in the coating was varied from 0 to 3 wt.-%. The coatings were scratched for studying the galvanic behavior of zinc under damaged condition. Electrochemical impedance spectroscopy, open circuit potential measurements and surface techniques were chosen to investigate the corrosion protection performance of the coating and sacrificial properties of zinc. Transmission electron microscopy illustrated the separations of clay layers which interacted with epoxy resin. In addition, TEM images showed the dispersion of clay nanosheets between zinc particles in coating matrix. Open circ...
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