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    The Electrochemical Behaviour of Stainless Steels after Treatment in Cerium-Containing Solutions


    Breslin, Carmel B. and Chen, C. and Mansfield, Florian (1997) The Electrochemical Behaviour of Stainless Steels after Treatment in Cerium-Containing Solutions. Corrosion Science, 39 (6). pp. 1061-1073. ISSN 0010-938X

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    Abstract

    The influence of cerium treatments on the anodic and cathodic polarisation behaviour of Type 316, 304 and 316L stainless steels is described. A decrease in the rate of the oxygen reduction reaction was observed on treating the stainless steels by immersion in cerium-containing solutions at elevated temperatures followed by polarization in the deep cathodic region. However, no inhibition of the oxygen reduction reaction was observed on simply treating the electrodes in the hot cerium-containing solutions. A more significant reduction in the rate of the cathodic reduction reaction was observed following the deposition of cerium oxides/hydroxide from ceriumcontaining solutions. This cathodic inhibition effect was found to diminish with continued immersion of the electrode in chloride-containing solutions. Reductions in the passive current densities, increases in the polarisation resistances and increases in the pitting potentials were observed for the stainless steels following treatment in boiling cerium solutions. Similar results were obtained on treating the electrodes in equivalent sodium-containing solutions. These apparent increases in the resistance to pitting attack were attributed to the dissolution of MnS inclusions during the boiling treatments giving rise to surfaces with lower population densities of pit nucleation sites. The reductions observed in the passive current densities were attributed to passivation by nitrate rather than anodic inhibition effects promoted by deposited cerium oxides/hydroxides.

    Item Type: Article
    Keywords: A. stainless steel; B. cerium; C. pitting corrosion; D. passive films;
    Academic Unit: Faculty of Science and Engineering > Chemistry
    Item ID: 7955
    Identification Number: https://doi.org/10.1016/S0010-938X(97)00007-3
    Depositing User: Dr. Carmel Breslin
    Date Deposited: 22 Feb 2017 15:20
    Journal or Publication Title: Corrosion Science
    Publisher: Elsevier
    Refereed: Yes
    URI:

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