Corrosion performance of polyaniline-polypyrrole composite coatings applied to low carbon steel

Polyaniline-polypyrrole composite coatings were electrochemically deposited on low carbon steel using an aqueous electrochemical process. In a previous investigation by the present authors, it has been demonstrated that the electrochemical deposition parameters affect the chemical structure and morphology of the coatings. In the present paper, the corrosion performance of. these coatings is reported. Direct current polarisation tests were used to measure the corrosion rate of the coatings. It vas shown that applied potential and molar feed ratio of monomers strongly influence the corrosion resistant properties of the coatings. It was also shown that the corrosion performance of the coatings was better when the adhesion strength of the coatings increased. (C) 2002 IoM Communications Ltd.