Probing propensity of grade 2205 duplex stainless steel towards atmospheric chloride-induced stress corrosion cracking

D. L. Engelberg, C. Örnek

    Research output: Contribution to journalArticlepeer-review

    Abstract

    © 2014 Institute of Materials, Minerals and Mining.The propensity of grade 2205 duplex stainless steel towards atmospheric chloride-induced stress corrosion cracking at 50°C has been investigated. Electron backscatter diffraction has been used to characterise as received and 750°C heat-treated microstructures. Screening tests in chloride-containing aqueous environments were employed to investigate the corrosion behaviour of both microstructures. These tests indicated significantly increased corrosion rates when exposed to HCl or FeCl3-containing environments. Stress corrosion cracking tests with atmospheric exposures for up to 12 months showed selective dissolution of the ferrite, accompanied by stress corrosion microcracks in the austenite. This work demonstrates that grade 2205 duplex stainless steel microstructure may be rendered susceptible to stress corrosion cracking under atmospheric exposure conditions at 50°C.
    Original languageEnglish
    Pages (from-to)535-539
    Number of pages4
    JournalCorrosion Engineering Science and Technology
    Volume49
    Issue number6
    DOIs
    Publication statusPublished - 1 Sep 2014

    Keywords

    • Duplex stainless steel
    • Electron backscatter diffraction
    • Localised corrosion
    • Microstructure
    • Selective corrosion
    • Stress corrosion cracking

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