Effect of Morphology on the Corrosion Performance of Polypyrrole Conductive Coatings

so far electropiolymerization bath for producing polypyrrole coating has consisted of two main constituents; monomer and counter -ion . In the present study polypyrrole was galvanostatically deposited onto carbon steel in aqueous solution containing 0.2 Mpyrrole and 0.1 M oxalic acid with 0.25,0.5,2.5g/l and without saccharin addition estimation of corrosion resistance of coatings emerged in 0.1 M NaCl solution revealed that coating produced with 0.5g/l saccharin addition has more noble corrosion potential and greater corrosion resistance. atomic force microscopy illustrated greater compaction of the coating produced in the presence of 0.5 g/l saccharin. it could be the reason for its higher corrosion resistance. thus adding sasccharin as the third constituent intoduced a new branch in electropolymerization polypyrrole coating with modified surface morphology.

Keywords:

conductive polymer , saccharin , AFM , tafel polarization.