Abstract:

The electrochemical corrosion behavior of chlorinated rubber top coating (single layer), inorganic zinc-rich primer/chlorinated rubber top coating (double layer) and inorganic zinc-rich primer/epoxy middle paste /chlorinated rubber top coating (tri-layer) in 3.5% NaCl solution was studied with electrochemical impedance spectroscopy (EIS).A series of impedance spectra of three coating systems during immersion were measured, and the protective properties were compared by the spectra.The results showed that the protective properties of the double layer was even worse than that of the single layer and the protective properties of the tri-layer coating was the best among the three coating systems.The epoxy middle paste played a very important role in the protective properties of the composite coating.