Abstract
Polyaniline (PANI) electrodeposition on bare and carbon nanotube (CNT) coated 316 SS was carried out using a cyclic voltammetry (CV) electropolymerization method in diluted H2SO4 media containing aniline monomer. CNTs were grown in a thermal CVD reactor on 316 SS either by direct growth using ethylene precursor or by continuous feeding of an external catalyst, ferrocene, dissolved in toluene as the carbon precursor. Corrosion behavior of the coated materials was assessed by potentiodynamic and potentiostatic methods in an attempt to simulate the working conditions of proton exchange membrane fuel cell (PEMFC) bipolar plates. While a thick PANI coating could not provide a protective barrier to either bare or CNT coated 316 SS samples, a sensible improvement in corrosion resistance was revealed in the presence of a thin PANI layer. However, the protective capability of the PANI thin film was still inadequate for the purpose of providing reasonable corrosion resistance to the material under simulated PEMFC conditions, due to severe deterioration of CNT coated 316 SS caused by the initial carbon treatment.
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