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    The Influence of Dichromate and Rare Earth Metal Passivation Treatments on the Dissolution of Sn/Zn Coatings


    Geary, M. and Breslin, Carmel B. (1997) The Influence of Dichromate and Rare Earth Metal Passivation Treatments on the Dissolution of Sn/Zn Coatings. Corrosion Science, 39 (8). pp. 1341-1350. ISSN 0010-938X

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    Abstract

    The electrochemical behaviour of an 80Sn20Zn electro-deposited alloy following passivation in a dichromate solution and a cerium-containing solution, was studied. It was found that both the dichromate and cerium passivation procedures lead to an increase in the corrosion protection afforded by the 80Sn20Zn electro-deposit. This was attributed to a reduction in the rate of the zinc dissolution reaction from the electro-deposit which in turn extended the cathodic protection periods of the deposit. Passivation of the electro-deposited alloy in the cerium-containing solution lead to the precipitation of cerium oxides/hydroxides in a non-uniform manner over the surface. This precipitated film of cerium had the appearance of a cracked-mud layer. Nevertheless, the additional corrosion protection afforded by the cerium passivation treatment was equivalent to that provided by the dichromate passivation treatment.

    Item Type: Article
    Keywords: A. 80Sn-20Zn alloy; B. cerium; C. dichromate; C. corrosion protection;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7956
    Identification Number: https://doi.org/10.1016/S0010-938X(97)00024-3
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 22 Feb 2017 15:19
    Journal or Publication Title: Corrosion Science
    Publisher: Elsevier
    Refereed: Yes
    URI:

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