Study of the sensitisation of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), by means of scanning electrochemical microscopy

R. Leiva-García, R. Akid, D. Greenfield, J. Gittens, M.J. Muñoz-Portero, J. García-Antón

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The feedback mode of a scanning electrochemical microscope (SECM) was applied to study differences in the reactivity of a highly alloyed austenitic stainless steel, Alloy 926 (UNS N08926), in its unsensitised and sensitised state. Alloy 926 was heated at 825◦C for 1h in an inert atmosphere in order to produce a sensitised metallurgical condition. Sensitisation was due to chromium carbide formation at the grain boundaries. The oxygen reduction reaction was used as an indicator to monitor the effect of the sen- sitisation process on the corrosion activity of the Alloy 926 surface in a 35 g l−1 NaCl solution. Higher oxygen consumption was observed above the sensitised sample than above the unsensitised sample due to differences in the oxide films of the two alloy conditions.
    Original languageEnglish
    Pages (from-to)105-111
    Number of pages6
    JournalElectrochimica Acta
    Volume70
    Publication statusPublished - 30 May 2012

    Keywords

    • Scanning electrochemical microscopy
    • Austenitic stainless steel
    • Sensitisation
    • Intergranular corrosion

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