Influence of sulphur anions on stainless steels in synthetic digesting liquors; some observations of polysulphide formation

Jaakko Rämö, Mika Sillanpää, Aila Kujala, Seppo Peltonen, Outi Hyökyvirta

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    Interactions between certain stainless steels (UNS S30400, S31603, S32205, S32304, hard chromium plated S31603, hard chromium plated S32205) and sulphur anions were investigated in synthetic liquors. The X-Ray Fluorescence (XRF) and Contact Electric Resistance (CER) techniques were used to study the sulphur rich layer of stainless steels formed during immersion. Ion Chromatography (IC), Ion Selective Electrodes (ISE) and ABC titration were adapted the modelling behaviour of the sulphur anions. Hydroxide content was found to correlate linearly with the adhesion of sulphur onto steel. Impact of sulphide was evident, but non-linear. For the solution, real amount of sulphide was less than the added amount. Thiosulphate had a tendency to convert into sulphite. The adhesion increased in the following order: S32304, S32205, S30400 and S31603. Film forming on S30400 possessed in most cases the highest film resistance properties measured by CER. Hard chromium plated steels appeared to be chemically inert.
    Original languageEnglish
    Title of host publication10th International Symposium on Corrosion in the Pulp and Paper Industry, ISCPPI. Vol. 2
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages441-454
    ISBN (Electronic)951-38-5724-7
    ISBN (Print)951-38-5721-2
    Publication statusPublished - 2001
    MoE publication typeA4 Article in a conference publication
    Event10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI - Helsinki, Finland
    Duration: 21 Aug 200124 Aug 2001

    Publication series

    SeriesVTT Symposium
    Number215
    ISSN0357-9387

    Conference

    Conference10th International Symposium On corrosion in the Pulp and Paper Industry, ISCPPI
    Abbreviated title10th ISCPPI
    CountryFinland
    CityHelsinki
    Period21/08/0124/08/01

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