Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions

Iva Betova, Martin Bojinov, Petri Kinnunen, Klas Lundgren, Timo Saario

    Research output: Contribution to conferenceConference articleScientific

    Abstract

    The ultimate goal of this work is to develop a deterministic model for activity incorporation and to increase the theoretical understanding of the oxide film build-up and breakdown, controlling the localised corrosion phenomena of structural materials in Light Water Reactors. In the present communication, the kinetic parameters of the incorporation of Zn aquoions during the initial stages of film growth on stainless steel in simulated Pressurised Water Reactor (PWR) conditions have been estimated. Also, a description for the effect of this process on film growth and restructuring is presented. To achieve that, the oxidation of AISI 316L(NG) in simulated PWR water (2.2 ppm Li, 1200 ppm B) with or without addition of 1 ppm Zn at 280oC for up to 72 h has been characterised in-situ by electrochemical impedance spectroscopy, both at the corrosion potential and under anodic polarisation up to 0.5 V vs. the reversible hydrogen electrode (RHE). Additional tests were performed in simulated PWR coolant with the addition of 0.01 M Na2B4O7 to exclude the effect of pH excursions probably due to hydrolysis reactions. The thickness and in-depth composition of the oxide films formed at open circuit and at 0.5 V vs. RHE in the investigated electrolytes have been assessed by X-ray photoelectron spectroscopy (XPS). The kinetic and transport parameters characterising the oxide layer growth have been estimated using a calculational procedure based on the Mixed Conduction Model for oxide films.
    Original languageEnglish
    Number of pages4
    Publication statusPublished - 2008
    MoE publication typeNot Eligible
    EventInternational Conference on Water Chemistry in Nuclear Reactor Systems - Berlin, Germany
    Duration: 15 Sep 200818 Sep 2008

    Conference

    ConferenceInternational Conference on Water Chemistry in Nuclear Reactor Systems
    CountryGermany
    CityBerlin
    Period15/09/0818/09/08

    Fingerprint

    Pressurized water reactors
    Stainless Steel
    Oxide films
    Film growth
    Hydrogen
    Corrosion
    Electrodes
    Light water reactors
    Anodic polarization
    Electrochemical impedance spectroscopy
    Kinetic parameters
    Coolants
    Oxides
    Electrolytes
    Hydrolysis
    X ray photoelectron spectroscopy
    Oxidation
    Kinetics
    Water
    Networks (circuits)

    Cite this

    Betova, I., Bojinov, M., Kinnunen, P., Lundgren, K., & Saario, T. (2008). Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions. Paper presented at International Conference on Water Chemistry in Nuclear Reactor Systems, Berlin, Germany.
    Betova, Iva ; Bojinov, Martin ; Kinnunen, Petri ; Lundgren, Klas ; Saario, Timo. / Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions. Paper presented at International Conference on Water Chemistry in Nuclear Reactor Systems, Berlin, Germany.4 p.
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    title = "Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions",
    abstract = "The ultimate goal of this work is to develop a deterministic model for activity incorporation and to increase the theoretical understanding of the oxide film build-up and breakdown, controlling the localised corrosion phenomena of structural materials in Light Water Reactors. In the present communication, the kinetic parameters of the incorporation of Zn aquoions during the initial stages of film growth on stainless steel in simulated Pressurised Water Reactor (PWR) conditions have been estimated. Also, a description for the effect of this process on film growth and restructuring is presented. To achieve that, the oxidation of AISI 316L(NG) in simulated PWR water (2.2 ppm Li, 1200 ppm B) with or without addition of 1 ppm Zn at 280oC for up to 72 h has been characterised in-situ by electrochemical impedance spectroscopy, both at the corrosion potential and under anodic polarisation up to 0.5 V vs. the reversible hydrogen electrode (RHE). Additional tests were performed in simulated PWR coolant with the addition of 0.01 M Na2B4O7 to exclude the effect of pH excursions probably due to hydrolysis reactions. The thickness and in-depth composition of the oxide films formed at open circuit and at 0.5 V vs. RHE in the investigated electrolytes have been assessed by X-ray photoelectron spectroscopy (XPS). The kinetic and transport parameters characterising the oxide layer growth have been estimated using a calculational procedure based on the Mixed Conduction Model for oxide films.",
    author = "Iva Betova and Martin Bojinov and Petri Kinnunen and Klas Lundgren and Timo Saario",
    note = "Project code: 6402 ; International Conference on Water Chemistry in Nuclear Reactor Systems ; Conference date: 15-09-2008 Through 18-09-2008",
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    Betova, I, Bojinov, M, Kinnunen, P, Lundgren, K & Saario, T 2008, 'Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions', Paper presented at International Conference on Water Chemistry in Nuclear Reactor Systems, Berlin, Germany, 15/09/08 - 18/09/08.

    Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions. / Betova, Iva; Bojinov, Martin; Kinnunen, Petri; Lundgren, Klas; Saario, Timo.

    2008. Paper presented at International Conference on Water Chemistry in Nuclear Reactor Systems, Berlin, Germany.

    Research output: Contribution to conferenceConference articleScientific

    TY - CONF

    T1 - Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions

    AU - Betova, Iva

    AU - Bojinov, Martin

    AU - Kinnunen, Petri

    AU - Lundgren, Klas

    AU - Saario, Timo

    N1 - Project code: 6402

    PY - 2008

    Y1 - 2008

    N2 - The ultimate goal of this work is to develop a deterministic model for activity incorporation and to increase the theoretical understanding of the oxide film build-up and breakdown, controlling the localised corrosion phenomena of structural materials in Light Water Reactors. In the present communication, the kinetic parameters of the incorporation of Zn aquoions during the initial stages of film growth on stainless steel in simulated Pressurised Water Reactor (PWR) conditions have been estimated. Also, a description for the effect of this process on film growth and restructuring is presented. To achieve that, the oxidation of AISI 316L(NG) in simulated PWR water (2.2 ppm Li, 1200 ppm B) with or without addition of 1 ppm Zn at 280oC for up to 72 h has been characterised in-situ by electrochemical impedance spectroscopy, both at the corrosion potential and under anodic polarisation up to 0.5 V vs. the reversible hydrogen electrode (RHE). Additional tests were performed in simulated PWR coolant with the addition of 0.01 M Na2B4O7 to exclude the effect of pH excursions probably due to hydrolysis reactions. The thickness and in-depth composition of the oxide films formed at open circuit and at 0.5 V vs. RHE in the investigated electrolytes have been assessed by X-ray photoelectron spectroscopy (XPS). The kinetic and transport parameters characterising the oxide layer growth have been estimated using a calculational procedure based on the Mixed Conduction Model for oxide films.

    AB - The ultimate goal of this work is to develop a deterministic model for activity incorporation and to increase the theoretical understanding of the oxide film build-up and breakdown, controlling the localised corrosion phenomena of structural materials in Light Water Reactors. In the present communication, the kinetic parameters of the incorporation of Zn aquoions during the initial stages of film growth on stainless steel in simulated Pressurised Water Reactor (PWR) conditions have been estimated. Also, a description for the effect of this process on film growth and restructuring is presented. To achieve that, the oxidation of AISI 316L(NG) in simulated PWR water (2.2 ppm Li, 1200 ppm B) with or without addition of 1 ppm Zn at 280oC for up to 72 h has been characterised in-situ by electrochemical impedance spectroscopy, both at the corrosion potential and under anodic polarisation up to 0.5 V vs. the reversible hydrogen electrode (RHE). Additional tests were performed in simulated PWR coolant with the addition of 0.01 M Na2B4O7 to exclude the effect of pH excursions probably due to hydrolysis reactions. The thickness and in-depth composition of the oxide films formed at open circuit and at 0.5 V vs. RHE in the investigated electrolytes have been assessed by X-ray photoelectron spectroscopy (XPS). The kinetic and transport parameters characterising the oxide layer growth have been estimated using a calculational procedure based on the Mixed Conduction Model for oxide films.

    M3 - Conference article

    ER -

    Betova I, Bojinov M, Kinnunen P, Lundgren K, Saario T. Incorporation of Zn into oxide films on stainless steel in simulated PWR conditions. 2008. Paper presented at International Conference on Water Chemistry in Nuclear Reactor Systems, Berlin, Germany.