Styrene butadiene co-polymer based conducting polymer composite as an effective corrosion protective coating

摘要

Electroactive conducting polymer composite coatings of polyaniline (PANI) are electrosynthesized on styrene-butadiene rubber (SBR) coated stainless steel electrode by potentiostatic method using aqueous H _2SO _4 as supporting electrolyte. The protective behaviour of these coatings in different corrosion media (3.5% NaCl and 0.5 M HCl) is investigated using Tafel polarization curves, open circuit potential measurements and electrochemical impedance spectroscopy. The results reveal that SBR/PANI composite coating is much better in corrosion protection than simple PANI coating. The corrosion potential of composite films shifts to more noble values indicating that SBR/PANI composite coating act as an effective corrosion protective layer.