Electrochemical Evaluation of Anticorrosive Performance of Organic Acid Doped Polyaniline Based Coatings

摘要

In this work we examine the performance of the organic acid doped polyaniline to impart protectionagainst corrosion when it is used as additive of long oil alkyd based red oxide primer paint. For thispurpose, polyaniline doped with tartaric acid, oxalic acid and citric acid were characterized throughFTIR and SEM studies. Cyclic voltammetry studies showed that doped polyaniline shown theelectrochemical activity of the paints. Accelerated corrosion experiments (salt water chamber) revealeda significant improvement in the performance of the paint formulation which contained the aliphaticorganic acid doped polyaniline coatings. These results were verified by evaluation of the electricalresistance and capacitance measurements of the films using electrochemical impedance spectroscopy.The results of this study reinforce the anticorrosive properties of long oil alkyd based red oxide primerpaint through the formation of a protective layer of oxides using coatings which contain tartaric aciddoped polyaniline..