Electrochemical synthesis and anti-corrosive properties of polyaniline, poly(2-anisidine), and poly(aniline-co-2-anisidine) films on stainless steel


Bereket G., Hür E., Şahin Y.

Progress in Organic Coatings, vol.54, no.1, pp.63-72, 2005 (Journal Indexed in SCI Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 54 Issue: 1
  • Publication Date: 2005
  • Doi Number: 10.1016/j.porgcoat.2005.06.002
  • Title of Journal : Progress in Organic Coatings
  • Page Numbers: pp.63-72

Abstract

Stable and adherent polymer films of polyaniline and of poly(2-anisidine) were grown on 304-stainless steel by cyclic voltammetry in tetrabutylammonium perchlorate/acetonitrile solution containing perchloric acid. Conducting poly(aniline-co-2-anisidine) was also formed on 304-stainless steel in same condition, but the film was unstable and peeled off after 3 h when it is immersed in aggressive solution. The structure and properties of these polymer films were characterized by FTIR and UV-vis spectroscopy and by electrochemical methods. The anti-corrosion behavior of polyaniline, poly(2-anisidine), and poly(aniline-co-2-anisidine) coated electrodes were investigated in 0.5 M hydrochloric acid solutions by potentiodynamic polarization technique, open circuit potential-time curves and electrochemical impedance spectroscopy. Poly(2-anisidine) film shows protection against corrosion 304-stainless steel in 0.5 M HCl by passivating steel substrate in similar manner as has been observed for polyaniline. But anti-corrosion behavior was slightly poorer than that of polyaniline. © 2005 Elsevier B.V. All rights reserved.