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    The corrosion/dissolution behaviour of aluminium in solutions containing both chloride and fluoride ions


    Carroll, William M. and Murphy, Miriam J. and Breslin, Carmel B. (1993) The corrosion/dissolution behaviour of aluminium in solutions containing both chloride and fluoride ions. Corrosion Science, 34 (9). pp. 1495-1507. ISSN 0010-938X

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    Abstract

    The corrosion behaviour of aluminium in sodium chloride or sodium fluoride solution is at the present time reasonably well understood. In chloride solution, localised attack on the oxide is the most usual problem encountered. In fluoride solution, the Al2O3 film is initially found to be removed to be replaced by a complex oxyfluoride film which subsequently determines the corrosion behaviour. In the present work, potentiodynamic, potentiostatic, open circuit potential and impedance tests are used to elucidate the corrosion behaviour of aluminium in solutions containing both chloride and fluoride ions. It has been found that the presence of fluoride does not lead to localised attack, but that it modifies the surface oxide in such a way as to facilitate attack by chloride. Surprisingly however, for a fixed 0.5 M chloride concentration, these effects of fluoride are only manifest in the concentration range 0.25–10−3 M fluoride at 20°C. Concentrations in excess of 0.25 M have no apparent activating influence. At higher temperatures, lower fluoride levels are sufficient to cause these oxide modifications. The presence of fluoride even in very small quantities prevents ‘film improvement’ reactions similar to those observed in chloride only solutions.

    Item Type: Article
    Keywords: Aluminium; Corrosion; Halides; Alumina; Chemical attack; Composition effects; Corrosion; Dissolution; Films; Fluorine compounds; Ions; Sodium chloride; Solutions; Complex oxyfluoride film; Localized attack; Surface oxide;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12514
    Identification Number: https://doi.org/10.1016/0010-938X(93)90244-B
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 04 Mar 2020 15:25
    Journal or Publication Title: Corrosion Science
    Publisher: Elsevier
    Refereed: Yes
    URI:

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