CORROSION PROTECTION PERFORMANCE OF LOW CARBON STEEL BY USING POLY (O-ANISIDINE) COATINGS AT DIFFERENT PH CONDITION

Abstract

The possibility of using the electrochemically synthesized poly(o-anisidine) (POA) coatings on low carbon steel (LCS) for corrosion protection purposes was examined under different pH condition. The POA coatings were synthesized from an aqueous solution of oxalic acid under cyclic voltammetry. The extent of the corrosion protection offered by these coatings to LCS in aqueous 3% NaCl was examined by potentiodynamic polarization technique. The potentiodynamic polarization measurements demonstrate that the POA acts as a protective layer on LCS against corrosion in chloride solution. The porosity in the coating was estimated by using the potentiodynamic polarization data and it is observed that the porosity depends on the pH condition used for the synthesis of the POA coatings. The protection of low carbon steel against corrosion in 3% NaCl by the POA coatings can be achieved more effectively when the synthesis was carried out in electropolymerization solution of pH 7.0. This study shows that a POA coating can be considered as a potential coating material to protect LCS against corrosion in a chloride environment Keywords: Corrosion protective coatings, Conducting polymer coatings, Poly(o-anisidine) coatings, Electrochemical polymerization, Cyclic voltammetry

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