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    The electrochemical behaviour of Al-Zn-In and Al-Zn-Hg alloys in aqueous halide solutions


    Breslin, Carmel B. and Friery, L.P. and Carroll, William M. (1993) The electrochemical behaviour of Al-Zn-In and Al-Zn-Hg alloys in aqueous halide solutions. Corrosion Science, 36 (1). pp. 85-97. ISSN 0010-938X

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    Abstract

    The electrochemical behaviour of 99.99% aluminium, an Al-Zn-In and Al-Zn-Hg alloy was investigated, and compared, in aqueous halide, sulphate and perchlorate solutions using electrochemical and surface analytical techniques. Localized attack was observed for pure aluminium and the two alloys (but at more electronegative potential values) in chloride, bromide, iodide and perchlorate solutions but attack of the mercury-containing alloy was observed, also, in sulphate and fluoride solutions. This was attributed to the additional effects of oxide detachment induced by mercury giving rise to large potential oscillations, approaching potential values close to the theoretical potential of aluminium, for immersion in sulphate solutions. The precipitation of oxyfluoride complexes in fluoride solutions leads to the observation of more passive behaviour in fluoride media. The major difference, in the electrochemical behaviour of pure aluminium and the alloys, lay in the extent of metastable attack, as evidenced by the higher frequency of current and potential fluctuations observed with the alloys, before complete breakdown of the passive films occurred.

    Item Type: Article
    Keywords: Alloying elements; Chlorine compounds; Composition effects; Electrochemical corrosion; Electrochemistry; Fluorine compounds; Indium; Mercury (metal)Passivation; Solutions; Sulfur compounds; Zinc; Halides solutions; Metastable attack; Perchlorate solutions; Sulphate solutions; Aluminum alloys; Al/Zn/In/Hg; Alloys; Electrochemical Processes;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 12517
    Identification Number: https://doi.org/10.1016/0010-938X(94)90111-2
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 05 Mar 2020 15:54
    Journal or Publication Title: Corrosion Science
    Publisher: Elsevier
    Refereed: Yes
    URI:

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