Electrodeposition of polypyrrole-titanate nanotube composites coatings and their corrosion resistance

P. Herrasti, A. N. Kulak, D. V. Bavykin, C. Ponce de Leon, J. Zekonyte, F. C. Walsh

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Polypyrrole (PPy) films (2 μm) containing titanate nanotubes (TiNT) were deposited from 0.5 mol dm−3 pyrrole (Py) and 1 g dm−3 of TiNT in 0.1 mol dm−3 aqueous oxalic acid on 904 L stainless steel (SS) 0.1 mm thickness at 298 K. Electron microscopy showed that the nanotubes were adsorbed on the PPy surface and uniformly dispersed in the polymer matrix. The PPy/TiNT composite contained <10 wt.% titanates which showed an increase of 53% hardness compared with polypyrrole alone. The TiNT provide nucleation centres to catalyze the polymerization of pyrrole and can adsorb up to 240 mg g−1 of the monomer. The corrosion rates for SS, SS/PPy and SS/PPy/TiTN composites, evaluated by linear sweep voltammetry and open-circuit potential measurements in 3% w/v NaCl, were 1.61, 0.008 and 0.004 mg dm−2 day−1, respectively, indicating that corrosion rates of stainless steel decreased by up to three orders of magnitude in the presence of the composite films.
    Original languageEnglish
    Pages (from-to)1323-1328
    JournalElectrochimica Acta
    Volume56
    Issue number3
    DOIs
    Publication statusPublished - 1 Jan 2011

    Keywords

    • Adsorption
    • Composites
    • Corrosion
    • Electrodeposition
    • Polypyrrole
    • Titanate nanotubes

    Cite this