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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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.",
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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

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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.

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