Characterisation of material behaviour in high temperature aqueous environments by means of electrochemical techniques

Martin Bojinov, Timo Laitinen, Kari Mäkelä, Timo Saario, Pekka Sirkiä, Björn Beverskog

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional

    Abstract

    Electrochemical measurements in solutions simulating power plant coolants are complicated by the low conductivity of the water, especially in the case of boiling water reactor (BWR) environments. To be able to obtain useful information also in BWR conditions, electrochemical techniques based on a thin-layer electrode arrangement are introduced. This arrangement makes it possible to perform voltammetric and electrochemical impedance measurements in high-temperature water with a room temperature conductivity (κ) as low as 0.1 μScm-1. A combination of these results with those obtained by means of measuring the resistance of the surface film using the contact electric resistance (CER) technique facilitates versatile characterisation of oxide film behaviour. Examples are given on impedance and CER measurements of the oxide films formed on AISI 316 stainless steel in high temperature high purity (κ < 0.3 μScm-1) water and on OX18H10T stainless steel in VVER water. Correlations between temperature, hydrogen and oxygen content of the solution and the oxide behaviour are discussed.
    Original languageEnglish
    Title of host publicationEnlarged Halden programme group meeting on high burn-up fuel performance, safety and reliability and degradation of in-core materials and water chemistry effects and man-machine systems research
    Number of pages20
    Publication statusPublished - 1998
    MoE publication typeD3 Professional conference proceedings
    EventEnlarged Halden Programme Group Meeting, EHPG 1998 - Lillehammer, Norway
    Duration: 15 Mar 199820 Mar 1998

    Publication series

    SeriesOECD Halden Reactor Project
    NumberHPR-349/48

    Conference

    ConferenceEnlarged Halden Programme Group Meeting, EHPG 1998
    CountryNorway
    CityLillehammer
    Period15/03/9820/03/98

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