Abstract
The inhibition of pitting corrosion of stainless steel (SS) is addressed in this paper by using a new type of anticorrosive coatings consisting of Nafion ®-polyaniline (PAn) composite films electrodeposited on stainless steel in a two-step process. The anticorrosive strategy presented here is based on the interfacial modification of SS with a Nafion ® film, which as a cationic selective membrane prevents chloride ions to reach the SS surface. In addition, chloride insertion to the composite Nafion ®-PAn film becomes less likely since sulfonate groups of the Nafion ® contribute to the charge compensation of PAn and therefore charge transport processes involve proton expulsion than anion insertion. Nafion ® films were pre-deposited at the surface of the SS electrode and the PAn films were formed on the SS|Nafion ® electrode by cyclic voltammetry in 0.5 M H 2SO 4 solutions containing 0.1 M aniline. Open circuit potential and potentiodynamic measurements were used for the evaluation of the corrosion protection properties of the Nafion ®-PAn composites.
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