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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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",
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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.