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    Electrochemical behaviour of aluminium in the presence of EDTA-containing chloride solutions


    Treacy, G.M. and Rudd, Amy L. and Breslin, Carmel B. (2000) Electrochemical behaviour of aluminium in the presence of EDTA-containing chloride solutions. Journal of Applied Electrochemistry, 30 (6). pp. 675-683. ISSN 0021-891X

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    Abstract

    The electrochemical behaviour of pure aluminium in an EDTA-containing chloride solution was investigated using potentiodynamic and potentiostatic electrochemical techniques and electrochemical impedance spectroscopy. A pronounced EDTA-induced anodic dissolution was observed in alkaline solutions, but the presence of EDTA in solution had little activating effect on the passivation properties at pH values close to 4.0. This was attributed to the relative stability of the Al(EDTA)− complex formed at the different pH values. This EDTA-induced activation had no deleterious effect on pitting attack, in fact, higher breakdown potentials were observed in the presence of EDTA. This was attributed to the buffering action of EDTA, which inhibited the attainment of a critical pit solution composition. But, in the presence of molybdate, EDTA had no observable effect on pitting attack. The impedance spectra recorded in the presence of EDTA showed evidence for the adsorption of EDTA species during the dissolution process, which in turn, form a large capacitive network, with capacitance values of the order of 3 mF cm−2 in the low frequency region.

    Item Type: Article
    Keywords: aluminium; dissolution; EDTA; pitting;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7944
    Identification Number: https://doi.org/10.1023/A:1003945214539
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 21 Feb 2017 16:18
    Journal or Publication Title: Journal of Applied Electrochemistry
    Publisher: Springer Verlag
    Refereed: Yes
    Funders: Enterprise Ireland (EI)
    URI:

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