Abstract
The effect of the presence of metal powders in an epoxy coating and the influence of their concentration on the assessment of the coatings behaviour in marine environment has been studied. Pretreated steel specimens have been coated with a layer of metal filled epoxy resin and their electrochemical and dielectric behaviour in corrosive environment (3.5% wt NaCl) has been investigated. Electrochemical Impedance Spectroscopy and Dielectric measurements were performed. In an effort to examine the influence of the presence of more and less electroactive metal powders than the steel substrate, Zn, Al, Fe, Cu, Ni in powder form were used as fillers in the epoxy coatings. Metal powder addition does not generally seem to worsen the protective performance of the coatings, compared to coatings of pure epoxy resin, except for the composites with copper or nickel particles which show a reduced protection performance, but they are still protective.
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