Mixed-conduction model for stainless steel in a high-temperature electrolyte: Estimation of kinetic parameters of inner layer constituents

Iva Betova, Martin Bojinov (Corresponding Author), Petri Kinnunen, Klas Lundgren, Timo Saario

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

A quantitative procedure of determination of kinetic and transport parameters for individual alloy constituents during anodic film growth on stainless steels in light reactor water is developed. It is based on in-depth compositional data for oxides obtained from ex situ analyses using Auger electron spectroscopy and X-ray photoelectron spectroscopy. The growth of the inner compact layer is described as a sequence of interfacial reactions and transport driven by homogeneous diffusion-migration mechanism. Based on the mixed-conduction model for oxide films, a fitting procedure for the calculation of the in-depth distribution of the individual alloy constituents in the inner layer is put forward. The effects of temperature and applied potential on the kinetic and transport parameters in the inner layer are assessed. In addition, the growth of an outer layer consisting of crystallites with pores filled with electrolyte in-between is described formally as a diffusion process and the transport parameters characterizing this process are estimated. The estimates of the kinetic and transport parameters obtained are discussed in relation to the corrosion mechanism of the steel and the incorporation of electrolyte-originating species in the bilayer oxide film. Using the proposed quantitative procedure, the kinetic and transport parameters of long-term (up to 10,000 h) film growth and restructuring on AISI 304 stainless steel in simulated pressurized water ractor (PWR) with or without zinc addition are also estimated on the basis of a quantitative comparison of the model predictions and literature data on the in-depth concentration profiles of the constituent elements. The obtained values are discussed in terms of the effect of Zn on the growth rate of the inner and outer layers of the corrosion film.
Original languageEnglish
Pages (from-to)C81-C92
Number of pages12
JournalJournal of the Electrochemical Society
Volume155
Issue number2
DOIs
Publication statusPublished - 2008
MoE publication typeA1 Journal article-refereed

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Stainless Steel
Kinetic parameters
Electrolytes
Stainless steel
Kinetics
Film growth
Oxide films
Corrosion
Temperature
Light water reactors
Steel
Auger electron spectroscopy
Surface chemistry
Crystallites
Oxides
Zinc
X ray photoelectron spectroscopy
Water

Cite this

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title = "Mixed-conduction model for stainless steel in a high-temperature electrolyte: Estimation of kinetic parameters of inner layer constituents",
abstract = "A quantitative procedure of determination of kinetic and transport parameters for individual alloy constituents during anodic film growth on stainless steels in light reactor water is developed. It is based on in-depth compositional data for oxides obtained from ex situ analyses using Auger electron spectroscopy and X-ray photoelectron spectroscopy. The growth of the inner compact layer is described as a sequence of interfacial reactions and transport driven by homogeneous diffusion-migration mechanism. Based on the mixed-conduction model for oxide films, a fitting procedure for the calculation of the in-depth distribution of the individual alloy constituents in the inner layer is put forward. The effects of temperature and applied potential on the kinetic and transport parameters in the inner layer are assessed. In addition, the growth of an outer layer consisting of crystallites with pores filled with electrolyte in-between is described formally as a diffusion process and the transport parameters characterizing this process are estimated. The estimates of the kinetic and transport parameters obtained are discussed in relation to the corrosion mechanism of the steel and the incorporation of electrolyte-originating species in the bilayer oxide film. Using the proposed quantitative procedure, the kinetic and transport parameters of long-term (up to 10,000 h) film growth and restructuring on AISI 304 stainless steel in simulated pressurized water ractor (PWR) with or without zinc addition are also estimated on the basis of a quantitative comparison of the model predictions and literature data on the in-depth concentration profiles of the constituent elements. The obtained values are discussed in terms of the effect of Zn on the growth rate of the inner and outer layers of the corrosion film.",
author = "Iva Betova and Martin Bojinov and Petri Kinnunen and Klas Lundgren and Timo Saario",
note = "Project code: 6402",
year = "2008",
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journal = "Journal of the Electrochemical Society",
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Mixed-conduction model for stainless steel in a high-temperature electrolyte : Estimation of kinetic parameters of inner layer constituents. / Betova, Iva; Bojinov, Martin (Corresponding Author); Kinnunen, Petri; Lundgren, Klas; Saario, Timo.

In: Journal of the Electrochemical Society, Vol. 155, No. 2, 2008, p. C81-C92.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Mixed-conduction model for stainless steel in a high-temperature electrolyte

T2 - Estimation of kinetic parameters of inner layer constituents

AU - Betova, Iva

AU - Bojinov, Martin

AU - Kinnunen, Petri

AU - Lundgren, Klas

AU - Saario, Timo

N1 - Project code: 6402

PY - 2008

Y1 - 2008

N2 - A quantitative procedure of determination of kinetic and transport parameters for individual alloy constituents during anodic film growth on stainless steels in light reactor water is developed. It is based on in-depth compositional data for oxides obtained from ex situ analyses using Auger electron spectroscopy and X-ray photoelectron spectroscopy. The growth of the inner compact layer is described as a sequence of interfacial reactions and transport driven by homogeneous diffusion-migration mechanism. Based on the mixed-conduction model for oxide films, a fitting procedure for the calculation of the in-depth distribution of the individual alloy constituents in the inner layer is put forward. The effects of temperature and applied potential on the kinetic and transport parameters in the inner layer are assessed. In addition, the growth of an outer layer consisting of crystallites with pores filled with electrolyte in-between is described formally as a diffusion process and the transport parameters characterizing this process are estimated. The estimates of the kinetic and transport parameters obtained are discussed in relation to the corrosion mechanism of the steel and the incorporation of electrolyte-originating species in the bilayer oxide film. Using the proposed quantitative procedure, the kinetic and transport parameters of long-term (up to 10,000 h) film growth and restructuring on AISI 304 stainless steel in simulated pressurized water ractor (PWR) with or without zinc addition are also estimated on the basis of a quantitative comparison of the model predictions and literature data on the in-depth concentration profiles of the constituent elements. The obtained values are discussed in terms of the effect of Zn on the growth rate of the inner and outer layers of the corrosion film.

AB - A quantitative procedure of determination of kinetic and transport parameters for individual alloy constituents during anodic film growth on stainless steels in light reactor water is developed. It is based on in-depth compositional data for oxides obtained from ex situ analyses using Auger electron spectroscopy and X-ray photoelectron spectroscopy. The growth of the inner compact layer is described as a sequence of interfacial reactions and transport driven by homogeneous diffusion-migration mechanism. Based on the mixed-conduction model for oxide films, a fitting procedure for the calculation of the in-depth distribution of the individual alloy constituents in the inner layer is put forward. The effects of temperature and applied potential on the kinetic and transport parameters in the inner layer are assessed. In addition, the growth of an outer layer consisting of crystallites with pores filled with electrolyte in-between is described formally as a diffusion process and the transport parameters characterizing this process are estimated. The estimates of the kinetic and transport parameters obtained are discussed in relation to the corrosion mechanism of the steel and the incorporation of electrolyte-originating species in the bilayer oxide film. Using the proposed quantitative procedure, the kinetic and transport parameters of long-term (up to 10,000 h) film growth and restructuring on AISI 304 stainless steel in simulated pressurized water ractor (PWR) with or without zinc addition are also estimated on the basis of a quantitative comparison of the model predictions and literature data on the in-depth concentration profiles of the constituent elements. The obtained values are discussed in terms of the effect of Zn on the growth rate of the inner and outer layers of the corrosion film.

U2 - 10.1149/1.2818774

DO - 10.1149/1.2818774

M3 - Article

VL - 155

SP - C81-C92

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

IS - 2

ER -