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The Poly (pyrrole-co-o-toluidine), ( PY / OT ) copolymer was prepared by chemically oxidative polymerization of pyrrole ( Py ) and o-toluidine ( OT ) in HCl aqueous medium. The copolymer was characterised by using Fourier Transform Infrared Spectroscopy ( FTIR ) technique. The coating of PY / OT copolymer on 8-Hydroxyquinoline sulphonic acid ( HQSA ) pretreated mild steel surface was chemically deposited using N-methyl-2-pyrrolidone ( NMP ) as the solvent. The corrosion performance of the PY / OT copolymer coating on steel, both scribed and unscribed samples, was studied by conducting immersion tests and electrochemical tests which include free corrosion potential measurements and potentiodynamic polarization measurements. The above tests were conducted in different corrosive media which include 0.1 M HCl , 5% NaCl solution, artificial seawater and distilled water. The performance of coating in open atmosphere was also evaluated by conducting atmospheric exposure test. The results of different studies indicate that PY / OT copolymer coating may be considered as potential coating material for corrosion protection of mild steel in the above corrosive medium.
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