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    The corrosion protection afforded by rare earth conversion coatings applied to magnesium


    Rudd, Amy L. and Breslin, Carmel B. and Mansfield, Florian (2000) The corrosion protection afforded by rare earth conversion coatings applied to magnesium. Corrosion Science, 42 (2). pp. 275-288. ISSN 0010-938X

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    Abstract

    The corrosion protection afforded by cerium, lanthanum and praseodymium conversion coatings formed on pure magnesium and a magnesium alloy, WE43, has been studied using dc polarisation and ac impedance techniques. The coatings, which were formed by immersion in rare-earth salt containing solutions, reduced significantly the dissolution of magnesium in a pH 8.5 buffer solution. With continued immersion of the treated electrodes in the aggressive pH 8.5 solution, the coatings first appeared to become more protective, but after periods exceeding 60 min began to deteriorate. This is attributed to the formation of magnesium hydroxy corrosion products and mixed rare earth/magnesium oxide/hydroxide coatings, which on continued immersion became consumed by the formation of magnesium corrosion products.

    Item Type: Article
    Keywords: Magnesium; Conversion coatings; Impedance spectroscopy; Cerium;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7945
    Identification Number: https://doi.org/10.1016/S0010-938X(99)00076-1
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 21 Feb 2017 16:18
    Journal or Publication Title: Corrosion Science
    Publisher: Elsevier
    Refereed: Yes
    Funders: NATO Collaborative Research Grant (950593), Forbairt
    URI:

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