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    Local electrochemistry and scanning probe microscopy techniques to clarify intergranular cracking phenomena in weldable martensitic stainless steels

    Access Status
    Fulltext not available
    Authors
    Maier, J.
    Kinsella, Brian
    Bailey, Stuart
    Becker, Thomas
    Ladwein, T.
    Date
    2009
    Type
    Conference Paper
    
    Metadata
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    Citation
    Maier, Jens and Kinsella, Brian and Bailey, Stuart and Becker, Thomas and Ladwein, Thomas. 2009. Local electrochemistry and scanning probe microscopy techniques to clarify intergranular cracking phenomena in weldable martensitic stainless steels, in NACE (ed), NACE - Corrosion Conference 2009, Mar 22 2009, p. 09088. Atlanta, Georgia USA: Omnipress.
    Source Title
    NACE - Corrosion Conference 2009
    Source Conference
    NACE - Corrosion Conference 2009
    Faculty
    Department of Applied Chemistry
    School of Science and Computing
    Faculty of Science and Engineering
    URI
    http://hdl.handle.net/20.500.11937/12007
    Collection
    • Curtin Research Publications
    Abstract

    Intergranular stress corrosion cracking (IGSCC) of weldable martensitic stainless steels (WMSS) has been a major concern in the oil and gas industry. It occurs under sweet and mildly sour wet service conditions and in the presence of hot chlorides. The cracking phenomenon is assumed to be due to the formation of chromiumrich carbides on former austenite grain boundaries in the heat affected zone of the weld. The chromium depletion in the surrounding matrix results in susceptibility to IGSCC. A combined approach using localized electrochemical measurements and scanning probe microscopy (SPM) techniques was utilized to locate sensitized zones in rich grade WMSS. The electrochemical measurements were performed using a custom built micro cell allowing measurements on small spot sizes. The resulting etched working electrode surfaces were then examined by atomic force microscopy (AFM). The electrochemical results corresponded well with local metal dissolution and etching imprints obtained using AFM respectively. Performing local electrochemical tests in combination with SPM investigation proved very valuable. The imprint on the working electrode surface left after electrochemical analysis revealed sensitized zones in both actual welded samples and simulated welded samples.

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