Dependence of the corrosion performance of polyaniline films applied on stainless steel on the nature of electropolymerisation solution

Polyaniline (PANI) films were deposited under cyclic voltammetric conditions on 304L stainless steel by aniline electropolymerisation from acidic and slightly basic solutions containing respectively the followed support-electrolytes: H2C2O4 and KNO3. found that the film produced in oxalic acidic medium was more conductive than that obtained in potassium nitrate one. NI coatings corrosion performances in 0.5 M NaCl were investigated and compared using standard electrochemical methods, electrochemical impedance spectroscopy (EIS) and SEM analysis. ghest corrosion resisting efficiency was obtained for PANInitrate which exhibited a significant physical barrier property against the attack of corrosive products. However, the corrosion protection of conductive PANIoxalic coating was related to its catalytic behavior.