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The corrosion of carbon steel in 0.5 M H2SO4 and its inhibition in presence of electrosynthesized film of polyaniline (PAN) were investigated by using Tafel polarization (TP) and electrochemical impedance spectroscopy. The surface morphology of the carbon steel before and after aniline electropoly¬merization was also investigated. TP showed a significant shift of the corrosion potential towards more negative values at the same time with the decrease of the corrosion current density. This fact suggests that the polymeric film behaves as a mixed inhibitor, acting predominantly on the cathodic process. Microscopic images showed a clear modification of the surfaces morphology when the carbon steel was corroded in presence of the inhibitor.

Keywords: carbon steel; anticorrosive protection; electropolymerization