Kinetic parameters of the oxidation of zirconium alloys in simulated WWER water: Effect of KOH content

Martin Bojinov (Corresponding Author), Wei Cai, Petri Kinnunen, Timo Saario

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The pre-transition oxides formed on two different types of zirconium alloys (Zircaloy 4 and E110) have been characterised in situ using electrochemical impedance spectroscopy (EIS) in high-temperature electrolyte simulating WWER conditions at 310 °C. To obtain a correlation between the oxide film thickness, the oxide growth rate and the impedance parameters, the EIS data have been fitted to a transfer function derived from the mixed-conduction model for oxide films, allowing for the contribution of both an inner, barrier type of oxide and a more defective outer layer. The values of the total oxide film thickness based on the model calculations have proved to be in a good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy. The main kinetic and transport parameters characterising the oxidation process have been estimated and discussed with regard to the effect of KOH content and alloy type on the mechanism of conduction through the formed oxide.
Original languageEnglish
Pages (from-to)45 - 54
Number of pages10
JournalJournal of Nuclear Materials
Volume378
Issue number1
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

Fingerprint

zirconium alloys
Zirconium alloys
Kinetic parameters
Oxides
Oxide films
oxide films
Oxidation
oxidation
oxides
Water
kinetics
impedance
Electrochemical impedance spectroscopy
water
Film thickness
film thickness
conduction
transfer functions
spectroscopy
Electrolytes

Keywords

  • zirconium alloys
  • nuclear reactors
  • fuel cladding corrosion
  • anodic oxide film
  • oxidation
  • oxide films
  • PWR
  • WWER

Cite this

@article{12976ac8756a49f7a31ec7050a064176,
title = "Kinetic parameters of the oxidation of zirconium alloys in simulated WWER water: Effect of KOH content",
abstract = "The pre-transition oxides formed on two different types of zirconium alloys (Zircaloy 4 and E110) have been characterised in situ using electrochemical impedance spectroscopy (EIS) in high-temperature electrolyte simulating WWER conditions at 310 °C. To obtain a correlation between the oxide film thickness, the oxide growth rate and the impedance parameters, the EIS data have been fitted to a transfer function derived from the mixed-conduction model for oxide films, allowing for the contribution of both an inner, barrier type of oxide and a more defective outer layer. The values of the total oxide film thickness based on the model calculations have proved to be in a good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy. The main kinetic and transport parameters characterising the oxidation process have been estimated and discussed with regard to the effect of KOH content and alloy type on the mechanism of conduction through the formed oxide.",
keywords = "zirconium alloys, nuclear reactors, fuel cladding corrosion, anodic oxide film, oxidation, oxide films, PWR, WWER",
author = "Martin Bojinov and Wei Cai and Petri Kinnunen and Timo Saario",
year = "2008",
doi = "10.1016/j.jnucmat.2008.04.014",
language = "English",
volume = "378",
pages = "45 -- 54",
journal = "Journal of Nuclear Materials",
issn = "0022-3115",
publisher = "Elsevier",
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}

Kinetic parameters of the oxidation of zirconium alloys in simulated WWER water : Effect of KOH content. / Bojinov, Martin (Corresponding Author); Cai, Wei; Kinnunen, Petri; Saario, Timo.

In: Journal of Nuclear Materials, Vol. 378, No. 1, 2008, p. 45 - 54.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Kinetic parameters of the oxidation of zirconium alloys in simulated WWER water

T2 - Effect of KOH content

AU - Bojinov, Martin

AU - Cai, Wei

AU - Kinnunen, Petri

AU - Saario, Timo

PY - 2008

Y1 - 2008

N2 - The pre-transition oxides formed on two different types of zirconium alloys (Zircaloy 4 and E110) have been characterised in situ using electrochemical impedance spectroscopy (EIS) in high-temperature electrolyte simulating WWER conditions at 310 °C. To obtain a correlation between the oxide film thickness, the oxide growth rate and the impedance parameters, the EIS data have been fitted to a transfer function derived from the mixed-conduction model for oxide films, allowing for the contribution of both an inner, barrier type of oxide and a more defective outer layer. The values of the total oxide film thickness based on the model calculations have proved to be in a good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy. The main kinetic and transport parameters characterising the oxidation process have been estimated and discussed with regard to the effect of KOH content and alloy type on the mechanism of conduction through the formed oxide.

AB - The pre-transition oxides formed on two different types of zirconium alloys (Zircaloy 4 and E110) have been characterised in situ using electrochemical impedance spectroscopy (EIS) in high-temperature electrolyte simulating WWER conditions at 310 °C. To obtain a correlation between the oxide film thickness, the oxide growth rate and the impedance parameters, the EIS data have been fitted to a transfer function derived from the mixed-conduction model for oxide films, allowing for the contribution of both an inner, barrier type of oxide and a more defective outer layer. The values of the total oxide film thickness based on the model calculations have proved to be in a good agreement with the values measured from the cross-section micrographs of the specimens using scanning electron microscopy. The main kinetic and transport parameters characterising the oxidation process have been estimated and discussed with regard to the effect of KOH content and alloy type on the mechanism of conduction through the formed oxide.

KW - zirconium alloys

KW - nuclear reactors

KW - fuel cladding corrosion

KW - anodic oxide film

KW - oxidation

KW - oxide films

KW - PWR

KW - WWER

U2 - 10.1016/j.jnucmat.2008.04.014

DO - 10.1016/j.jnucmat.2008.04.014

M3 - Article

VL - 378

SP - 45

EP - 54

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

SN - 0022-3115

IS - 1

ER -