Corrosion protection of stainless steel plates in fuel cells environment by conducting polymers

Abstract

The electrodeposition of polypyrrole and polyaniline has been performed in aqueous solutions of sodium saccharinate and sulphuric acid, respectively. The coatings were obtained by voltamperometric and galvanostatic methods. The corrosion behaviour of polypyrrole and polyaniline coated stainless steel (SS) in sulphuric acid medium was investigated by linear polarisation, open circuit potential and electrochemical impedance spectroscopy. The polyaniline coatings doped with sulphate anions (SO42−) showed more resistance to protect SS to corrosion than the polypyrrole coatings doped with saccharinate anions (C7H4NO3S−).

The Effect of Electrodeposited PANI on Corrosion Behavior of 316 Stainless Steel Coated by CVD Grown MWCNTs under PEMFC Bipolar Plate Working Condition

“…Numerous groups have reported on the protective effects of these coatings against corrosion (23)(24)(25)(26). These polymers can be coated on SS both chemically and electrochemically.…”

Electrochemical and spectroscopical studies of polypyrrole synthesized on carbon steel from aqueous medium

“…We have already studied the corrosion protection of iron [25] and stainless steel [19] by polypyrrole coatings. In the present paper, we investigate several electrochemical and spectroscopical techniques to study the electrodeposition of PPy on carbon steel from saccharinate aqueous medium and its behavior in NaCl corrosive solution.…”

“…Herrasti and Ocon [17] showed the corrosion protective effect of PPy on stainless steel by producing a shift of corrosion potential to positive direction and reducing the oxidation current. We showed in our previous work that PPy coating prevents corrosion by isolation and charge transfer mechanism [18,19]. Recently, a broader concept based on anion-exchange through the polymer backbone structure was reported to explain metal passivation [20][21][22].…”

Optimising parameters for galvanostatic polyaniline coating on nanostructured bainitic steel

“…14,15 Polyaniline (PANI), one of the widely studied conducting polymers for various applications, has shown effective corrosion protection properties for several metals in various environments. [16][17][18][19][20] Generally, the performance of conducting polymer coatings depends on the coating techniques, processing conditions and the type of metal substrate. 16,17,[21][22][23] Conducting polymer coating on metals can be performed using chemical or electrochemical method.…”