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An attempt has been made towards the synthesis of strongly adherent poly( 2,5-dimethylaniline) coatings on low carbon steel substrates , with an objective of examining the possibility of using this polymer for corrosion protection of steel in chloride environment. In this work, the poly( 2,5-dimethylaniline) coatings were synthesized by electrochemical polymerization of 2,5-dimethylaniline using sodium salicylate as a supporting electrolyte. The characterization of these coatings was carried out by cyclic voltammetry, UV-visible absorption spectroscopy, Fourier transform infrared spectroscopy and scanning electron microscopy. The results of these characterizations indicate that the aqueous salicylate solution is a suitable medium for the electrochemical polymerization of 2,5-dimethylaniline to generate strongly adherent and smooth poly( 2,5-dimethylaniline) coatings on low carbon steel substrates. The performance of poly( 2,5-dimethylaniline) as protective coating against corrosion of low carbon steel in aqueous 3% NaCl was assessed by the open circuit potential and the potentiodynamic polarization measurements. The potentiodynamic polarization measurement reveals that the poly( 2,5-dimethylaniline) coating increases the corrosion potential and reduces the corrosion rate of low carbon steel almost by a factor of 50. This study clearly ascertains that the poly( 2,5-dimethylaniline) has outstanding capability to protect low carbon steel against corrosion in chloride environment. [ABSTRACT FROM AUTHOR]

Poly(o-anisidine) (POA) coatings were synthesised on low carbon steel substrates by electrochemical polymerisation of o-anisidine under cyclic voltammetric conditions from an aqueous solution of sodium tartrate. The resulting POA coatings were uniform and strongly adherent to the substrates. The coatings were characterised by cyclic voltammetry, UV-visible absorption spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction measurements and scanning electron microscopy. The ability of the POA coatings to protect the steel in an aqueous 3%NaCl solution was evaluated by the potentiodynamic polarisation technique and cyclic voltammetry. It was found that the POA coating ennobled the corrosion potential and significantly reduced the corrosion rate of the steel. [ABSTRACT FROM AUTHOR]