The corrosion resistance of a polyester-acrylate-based UV-curing coating was investigated using electrochemical impedance spectroscopy. The resin was then modified using a hydrophobic compound and the influence of this modification on physical, mechanical and corrosion resistance properties of the coatings was studied. A broadening of the Nyquist graph in the direction of real impedance was observed in all immersion times. A Warburg diffusion element was incorporated into the equivalent circuit to account for this broadening. This observation has been reported only for high-performance protective coatings based on epoxy chemistry at DFTs of several hundreds of microns. The high diffusion resistance was attributed to the high cross-link density which is obtainable through UV-curing process/materials. This reveals the potential of radical-cure UV-curing coatings as high performance anti-corrosion systems. We believe that the presence of anti-corrosion and barrier pigments may improve the anti-corrosion properties of the coatings even more.
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