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    Polypyrrole doped with dodecylbenzene sulfonate as a protective coating for copper

    Carragher, Ursula and Breslin, Carmel B. (2018) Polypyrrole doped with dodecylbenzene sulfonate as a protective coating for copper. Electrochimica Acta, 291. pp. 362-372. ISSN 0013-4686

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    Polypyrrole doped with dodecylbenzene sulfonate (DBS) was formed at copper, PPyeDBS, and at a thin coating of polypyrrole doped with tartrate to form a bilayer of PPyeTar/PPyeDBS at copper. The two polymer coatings showed good protective properties. Breakdown potentials of 0.85 V and 0.93 V vs SCE were recorded in 0.1 M NaCl for the PPyeDBS and PPyeTar/PPyeDBS bilayer, respectively. The more protective properties of the bilayer were explained in terms of an adherent thin polymer that was formed in the tartrate solution without significant dissolution of copper before the polymer was nucleated. The protective properties were also evident from open-circuit potential measurements where the potential adopted by the polymer coated copper remained constant and higher than the potential of the uncoated copper for several days. Furthermore, a decrease in the corrosion current density was observed from 1.95 mA cm-2 for copper to 0.12 mA cm-2 for the bilayer. The concentration of DBS had an influence on the properties of the polymer films with more protective films formed in 0.05 M DBS. The critical micelle concentration of DBS in 0.3 M pyrrole was measured as 9.8 mM, indicating a relatively high level of micelles in 0.05 M DBS. The protective properties of the coating were attributed to the large and immobile DBS anion, which gives the polymer cation exchange properties, minimising the uptake of chloride anions. In addition, the incorporation of anionic micelles may occur to repel further the chloride anions.

    Item Type: Article
    Keywords: Corrosion protection; Copper; Dodecylbenzene sulfonate; Polypyrrole; Tartrate;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 16093
    Identification Number:
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 14 Jun 2022 14:07
    Journal or Publication Title: Electrochimica Acta
    Publisher: Elsevier B.V.
    Refereed: Yes
    Use Licence: This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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