Field testing of stainless steels in paper machine environment

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    Abstract

    At the wet ends of paper machines and especially at splash zones, pitting and crevice corrosion of stainless steels caused by chloride (C[Symbol Not Transcribed]) and thiosulphate (S[Symbol Not Transcribed]O[Symbol Not Transcribed]) ions is a common phenomenon. Chloride ions originate from wood floated in sea water, supplied water and chemicals added to the pulp mix. Mechanical pulp brightened with dithionite (S[Symbol Not Transcribed]O[Symbol Not Transcribed]) is the main source of thiosulphate ions (f.1). Thiosulphate pitting is known to occur within a narrow voltage potential range (f.2) and molar ratio [Equation Not Transcribed] (f.3). The most sensitive region for thiosulphate pitting is in the potential range of 0 to -400 mV[Symbol Not Transcribed] (f.4) and molar ratios of 10 to 30 (f.3). To initiate thiosulphate pitting corrosion on type 316L stainless steel the molar ratio [C[Symbol Not Transcribed]]/[SO[Symbol Not Transcribed]] should be [Symbol Not Transcribed]1 (f.3).
    Original languageEnglish
    Pages (from-to)47-50
    Number of pages4
    JournalPulp and Paper Canada
    Volume100
    Issue number4
    Publication statusPublished - 1999
    MoE publication typeA1 Journal article-refereed

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