TITLE:
Corrosion Protection of Carbon Steel by Poly (aniline-co-o-toluidine) and Poly (pyrrole-co-o-toluidine) Copolymer Coatings
AUTHORS:
Nelofar Tanveer, M. Mobin
KEYWORDS:
Corrosion protective coatings, Aniline, Pyrrole, Oxidative copolymerization.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.10 No.8,
June
27,
2011
ABSTRACT: The soluble copolymers, poly (aniline-co-o-toluidine) and poly (pyrrole-co-o-toluidine) were
synthesized by chemical oxidative copolymerization using ammonium persulphate as an
oxidant in hydrochloride aqueous medium and characterized by FTIR spectroscopy. The
polymers were dissolved in N-methyl-2-pyrrolidone and casted by solution evaporation on to
the metallic substrate. The corrosion performance of the poly (aniline-co-o-toluidine) and
poly (pyrrole-co-o-toluidine) coatings on carbon steel was studied by conducting immersion
tests and electrochemical tests which include free corrosion potential measurements and
potentiodynamic polarization measurements. The tests were conducted in 0.1 M HCl and 5%
NaCl solution. The performance of coating in open atmosphere was also evaluated by
conducting atmospheric exposure test. The surface morphology of the copolymer coatings
were studied by scanning electron microscopy (SEM). The anticorrosive properties of
copolymer coatings were also compared with polyaniline and poly (o-toluidine) coatings. In
general the performance of poly (aniline-co-o toluidine) copolymer was found better than
poly (pyrrole-co-o-toluidine) and homopolymer.