Electrodeposition and Characterization of Polyaniline on Stainless Steel Surface via Cyclic, Convolutive Voltammetry and SEM in Aqueous Acidic Solutions

Abstract

The electrodeposition of polyaniline on stainless steel electrode was carried out in aqueous media at two different concentrations of sulphuric acid under potentiodynamic conditions. It was found that the nature of the voltammograms in 0.5M and 1M of H2SO4 are simillar. The first voltammetric wave (A1 & C1) of the cyclic voltammograms corresponding to transition from leucoemaraldine (LE) state to emeraldine (EM) state. The deposited films were characterized electrochemically and microscopically. The deposition of polyaniline appears to occur over the passive metal oxide film and the electron transfer between the polymer and the metal occur. Polyaniline films on stainless steel appear to be promising for metal anodic protection in corrosive aqueous media. The electrochemical parameters of the electrodeposited polyaniline were determined using cyclic voltammetry, convolution- deconvolution transforms and derived chronoamperograms.