INVESTIGATION OF CORROSION PROTECTION OF STEEL BY POLYANILINE FILMS

In the present study potentiodynamic polarisation curves were obtained for carbon and stainless steel in contact with 3% sodium chloride aqu eous solution saturated with air in order to evaluate the capacity of polyaniline in the emeraldine oxidation state to protect the surface a gainst corrosion processes. A high stability of the PAni films was obs erved with a gain of the corrosion potential around 270 mV more positi ve in the substrate covered with PAni than in the case without it. Cor rosion of steel could be prevented using the conducting polymers as a protective layer. (C) 1997 Elsevier Science Ltd.