Ditect electrodeposition of protective polypyrrole film on carbon stell surface using salicylate counter-ion

Abstract

A homogeneous and adherent Polypyrrole (PPy)film can be electrodeposited on carbon steel surface in the aqueous media using salicylate counter-ion. Protective properties of obtained Ppy films were studied in the solution NaCl.1 M by following the open circuit potential ofsystem vs immersion time. The influence of synthesis medium (pH value, monomer and electrolyte concentrations) and of applying current density was investigated. The protection time of the best PPy film electrosynthesized in acidic medium was about one week, whereas it was two weeks in the case of neutral synthesis medium. The result observed on the iron surface was about 3 months. It is very interesting to notice that the best protective PPy film can be obtained by a soft procedure, e.g. neutral medium and grand applying current density, which is well suitable for industry application.