In-situ studies of the oxide film properties on BWR fuel cladding materials

Martin Bojinov, Lena Hansson-Lyyra, Petri Kinnunen, Timo Saario, Pekka Sirkiä

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)

    Abstract

    The pre-transition oxides formed on five different types of Zircaloy-2 alloys have been characterized in-situ using electrochemical impedance spectroscopy (EIS) in high-temperature water simulating BWR conditions at 300°C. The contribution of the oxide film properties to the impedance spectra has been distinguished from the contribution of the corrosion reaction by performing additional EIS measurements in a gas atmosphere. To obtain a correlation between the oxide film thickness, the oxide growth rate, and the impedance parameters, the EIS data have been fitted to the transfer functions derived from the Mixed Conduction Model for oxide films. As a result, the oxide growth rate of each alloy has been calculated assuming that the growth rate is proportional to the flux of oxygen vacancies through the film. The values of the oxide film thickness based on the model calculations have proved to be in good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy (SEM). The measured corrosion properties have been qualitatively correlated to the secondary phase particle distributions of the five fuel cladding materials. However, to establish a quantitative correlation between the corrosion rates and the second phase particle distributions of these alloys, more data on the microstructure of the metal-oxide interface are needed.
    Original languageEnglish
    Pages (from-to)183 - 198
    Number of pages16
    JournalJournal of ASTM International
    Volume2
    Issue number4
    DOIs
    Publication statusPublished - 2005
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Oxides
    Oxide films
    Electrochemical impedance spectroscopy
    Dielectric Spectroscopy
    Corrosion
    Film thickness
    Oxygen vacancies
    Corrosion rate
    Electric Impedance
    Transfer functions
    Growth
    Gases
    Metals
    Fluxes
    Microstructure
    Scanning electron microscopy
    Water
    Atmosphere
    Electron Scanning Microscopy
    Oxygen

    Keywords

    • Zircaloy-2
    • corrosion
    • oxide growth
    • second phase particle distribution
    • electrochemical impedance spectroscopy

    Cite this

    Bojinov, Martin ; Hansson-Lyyra, Lena ; Kinnunen, Petri ; Saario, Timo ; Sirkiä, Pekka. / In-situ studies of the oxide film properties on BWR fuel cladding materials. In: Journal of ASTM International. 2005 ; Vol. 2, No. 4. pp. 183 - 198.
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    title = "In-situ studies of the oxide film properties on BWR fuel cladding materials",
    abstract = "The pre-transition oxides formed on five different types of Zircaloy-2 alloys have been characterized in-situ using electrochemical impedance spectroscopy (EIS) in high-temperature water simulating BWR conditions at 300°C. The contribution of the oxide film properties to the impedance spectra has been distinguished from the contribution of the corrosion reaction by performing additional EIS measurements in a gas atmosphere. To obtain a correlation between the oxide film thickness, the oxide growth rate, and the impedance parameters, the EIS data have been fitted to the transfer functions derived from the Mixed Conduction Model for oxide films. As a result, the oxide growth rate of each alloy has been calculated assuming that the growth rate is proportional to the flux of oxygen vacancies through the film. The values of the oxide film thickness based on the model calculations have proved to be in good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy (SEM). The measured corrosion properties have been qualitatively correlated to the secondary phase particle distributions of the five fuel cladding materials. However, to establish a quantitative correlation between the corrosion rates and the second phase particle distributions of these alloys, more data on the microstructure of the metal-oxide interface are needed.",
    keywords = "Zircaloy-2, corrosion, oxide growth, second phase particle distribution, electrochemical impedance spectroscopy",
    author = "Martin Bojinov and Lena Hansson-Lyyra and Petri Kinnunen and Timo Saario and Pekka Sirki{\"a}",
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    In-situ studies of the oxide film properties on BWR fuel cladding materials. / Bojinov, Martin; Hansson-Lyyra, Lena; Kinnunen, Petri; Saario, Timo; Sirkiä, Pekka.

    In: Journal of ASTM International, Vol. 2, No. 4, 2005, p. 183 - 198.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - In-situ studies of the oxide film properties on BWR fuel cladding materials

    AU - Bojinov, Martin

    AU - Hansson-Lyyra, Lena

    AU - Kinnunen, Petri

    AU - Saario, Timo

    AU - Sirkiä, Pekka

    N1 - Project code: G4SU00019

    PY - 2005

    Y1 - 2005

    N2 - The pre-transition oxides formed on five different types of Zircaloy-2 alloys have been characterized in-situ using electrochemical impedance spectroscopy (EIS) in high-temperature water simulating BWR conditions at 300°C. The contribution of the oxide film properties to the impedance spectra has been distinguished from the contribution of the corrosion reaction by performing additional EIS measurements in a gas atmosphere. To obtain a correlation between the oxide film thickness, the oxide growth rate, and the impedance parameters, the EIS data have been fitted to the transfer functions derived from the Mixed Conduction Model for oxide films. As a result, the oxide growth rate of each alloy has been calculated assuming that the growth rate is proportional to the flux of oxygen vacancies through the film. The values of the oxide film thickness based on the model calculations have proved to be in good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy (SEM). The measured corrosion properties have been qualitatively correlated to the secondary phase particle distributions of the five fuel cladding materials. However, to establish a quantitative correlation between the corrosion rates and the second phase particle distributions of these alloys, more data on the microstructure of the metal-oxide interface are needed.

    AB - The pre-transition oxides formed on five different types of Zircaloy-2 alloys have been characterized in-situ using electrochemical impedance spectroscopy (EIS) in high-temperature water simulating BWR conditions at 300°C. The contribution of the oxide film properties to the impedance spectra has been distinguished from the contribution of the corrosion reaction by performing additional EIS measurements in a gas atmosphere. To obtain a correlation between the oxide film thickness, the oxide growth rate, and the impedance parameters, the EIS data have been fitted to the transfer functions derived from the Mixed Conduction Model for oxide films. As a result, the oxide growth rate of each alloy has been calculated assuming that the growth rate is proportional to the flux of oxygen vacancies through the film. The values of the oxide film thickness based on the model calculations have proved to be in good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy (SEM). The measured corrosion properties have been qualitatively correlated to the secondary phase particle distributions of the five fuel cladding materials. However, to establish a quantitative correlation between the corrosion rates and the second phase particle distributions of these alloys, more data on the microstructure of the metal-oxide interface are needed.

    KW - Zircaloy-2

    KW - corrosion

    KW - oxide growth

    KW - second phase particle distribution

    KW - electrochemical impedance spectroscopy

    U2 - 10.1520/JAI12820

    DO - 10.1520/JAI12820

    M3 - Article

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    SP - 183

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    JO - Journal of ASTM International

    JF - Journal of ASTM International

    SN - 1546-962X

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