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    Polyaniline-coated iron: studies on the dissolution and electrochemical activity as a function of pH


    Fenelon, Anna M. and Breslin, Carmel B. (2005) Polyaniline-coated iron: studies on the dissolution and electrochemical activity as a function of pH. Surface and Coatings Technology, 190 (2-3). pp. 264-270. ISSN 0257-8972

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    Abstract

    Polyaniline coatings were electrodeposited from an oxalic acid solution onto iron and their electrochemical activity and corrosion protection properties studied as a function of pH. It was found that the coating (emeraldine salt) had a limited effect on the corrosion protection of iron in acidic solutions. However, in an alkaline borate solution, where the conducting polyaniline was converted to the emeraldine base, the coating had a clear beneficial effect on the local breakdown of iron by chloride anions; much higher pitting potentials were recorded following a 2 h immersion period for the polyaniline-coated substrate relative to the uncoated electrode. Relatively small anions, such as acetates, nitrates and borates, were transported readily across the polymer interface. However, the emeraldine base inhibited the transport of the much larger ethylenediamine tetraacetate (EDTA) species to the iron interface, preventing complexation of the iron by EDTA.

    Item Type: Article
    Keywords: Polyaniline; Iron; Corrosion; Emeraldine base; Emeraldine salt;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7926
    Identification Number: https://doi.org/10.1016/j.surfcoat.2004.04.083
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 15 Feb 2017 16:38
    Journal or Publication Title: Surface and Coatings Technology
    Publisher: Elsevier B.V.
    Refereed: Yes
    Funders: Enterprise Ireland (EI)
    URI:

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