Influence of water chemistry on the corrosion mechanism of a zirconium-niobium alloy in simulated light water reactor coolant conditions

Martin Bojinov; Vasil Karastoyanov; Petri Kinnunen; Timo Saario

doi:10.1016/j.corsci.2009.08.045

Influence of water chemistry on the corrosion mechanism of a zirconium-niobium alloy in simulated light water reactor coolant conditions

Martin Bojinov (Corresponding Author), Vasil Karastoyanov, Petri Kinnunen, Timo Saario

Research output: Contribution to journal › Article › Scientific › peer-review

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Abstract

The oxidation of the zirconium alloy E110 inf simulated nuclear power plant coolant at 310 °C is characterised using in situ Electrochemical Impedance Spectroscopy (EIS) and ex-situ microscopic observations. EIS data have been fitted to a transfer function derived from the Mixed Conduction Model. The kinetic parameters characterising the oxidation process – interfacial rate constant of oxidation, diffusion coefficient of oxygen vacancies, and field strength in the inner layer – have been estimated. The dependence of their values on LiOH/KOH/NaF content are discussed in terms of an enhanced rate of dissolution of the barrier layer at higher level of alkali and fluoride.

Original language	English
Pages (from-to)	54-67
Number of pages	14
Journal	Corrosion Science
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.corsci.2009.08.045
Publication status	Published - 2010
MoE publication type	A1 Journal article-refereed

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Bojinov, M., Karastoyanov, V., Kinnunen, P., & Saario, T. (2010). Influence of water chemistry on the corrosion mechanism of a zirconium-niobium alloy in simulated light water reactor coolant conditions. Corrosion Science, 52(1), 54-67. https://doi.org/10.1016/j.corsci.2009.08.045

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AU - Saario, Timo

PY - 2010

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N2 - The oxidation of the zirconium alloy E110 inf simulated nuclear power plant coolant at 310 °C is characterised using in situ Electrochemical Impedance Spectroscopy (EIS) and ex-situ microscopic observations. EIS data have been fitted to a transfer function derived from the Mixed Conduction Model. The kinetic parameters characterising the oxidation process – interfacial rate constant of oxidation, diffusion coefficient of oxygen vacancies, and field strength in the inner layer – have been estimated. The dependence of their values on LiOH/KOH/NaF content are discussed in terms of an enhanced rate of dissolution of the barrier layer at higher level of alkali and fluoride.

AB - The oxidation of the zirconium alloy E110 inf simulated nuclear power plant coolant at 310 °C is characterised using in situ Electrochemical Impedance Spectroscopy (EIS) and ex-situ microscopic observations. EIS data have been fitted to a transfer function derived from the Mixed Conduction Model. The kinetic parameters characterising the oxidation process – interfacial rate constant of oxidation, diffusion coefficient of oxygen vacancies, and field strength in the inner layer – have been estimated. The dependence of their values on LiOH/KOH/NaF content are discussed in terms of an enhanced rate of dissolution of the barrier layer at higher level of alkali and fluoride.

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DO - 10.1016/j.corsci.2009.08.045

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10.1016/j.corsci.2009.08.045