Corrosion protection of steel by electropolymerization of o-chloroaniline and o-aminobenzoic acid in the presence of Tween 80 surfactant

Abstract

The conducting polymers, poly-o-chloroaniline and poly-o-aminobenzoic acid have been synthesized from their monomers on steel surface by cyclic voltammetry method in aqueous oxalic acid solution containing different concentrations of Tween 80 surfactant. The polymers were characterized by scanning electron microscope SEM. Potentiodynamic polarization and electrochemical impedance spectroscopy EIS techniques have been used to investigate the corrosion behavior of the polymer coated steel electrodes in 0.5 M H 2 SO 4 solution. Effect of the surfactant on the electropolymerization process and the protection efficiency of the polymerized coat have been studied. Effect of substituent in the molecule of the monomer on the protection efficiency of the polymerized coat has been also studied.