Surface film electrochemistry of austenitic stainless steel and its main constituents in supercritical water

Iva Betova, Martin Bojinov, Petri Kinnunen, Sami Penttilä, Timo Saario

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)

Abstract

Supercritical water is used as a solvent and reagent for the decomposition of toxic and hazardous wastes, and is also considered as a prospective coolant in fossil fuel and new generation nuclear power plants. In that respect, mechanisms of corrosion of candidate reactor materials in supercritical water remain to be elucidated in order to devise criteria on the most suitable alloy for a specific application in a more deterministic way. In the present paper, results on the oxidation behaviour of UNS S31600 stainless steel and its main constituent elements (Fe, Cr and Ni) in supercritical water (500–700 °C, 30 MPa) stemming from both in situ oxide film resistance and impedance measurements and ex situ microscopic and spectroscopic analyses are presented. They are discussed within the frames of an approach combining thermodynamic and kinetic considerations from both aqueous electrochemistry at subcritical temperatures and gas/steam oxidation of compatible materials in the relevant temperature range. Tentative conclusions concerning the temperature limits of applicability of Pourbaix and Ellingham diagrams for the thermodynamic description of corrosion have been drawn.
Original languageEnglish
Pages (from-to)333-340
JournalJournal of Supercritical Fluids
Volume43
Issue number2
DOIs
Publication statusPublished - 2007
MoE publication typeA1 Journal article-refereed

Fingerprint

austenitic stainless steels
Electrochemistry
electrochemistry
Austenitic stainless steel
Water
corrosion
reactor materials
Hazardous Waste
hazardous wastes
Thermodynamics
Corrosion
water
Oxidation
thermodynamics
oxidation
fossil fuels
Poisons
nuclear power plants
Stainless Steel
impedance measurement

Keywords

  • Stainless steel
  • Supercritical water
  • Corrosion layer
  • Ex situ analysis
  • Electrochemical impedance spectroscopy

Cite this

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title = "Surface film electrochemistry of austenitic stainless steel and its main constituents in supercritical water",
abstract = "Supercritical water is used as a solvent and reagent for the decomposition of toxic and hazardous wastes, and is also considered as a prospective coolant in fossil fuel and new generation nuclear power plants. In that respect, mechanisms of corrosion of candidate reactor materials in supercritical water remain to be elucidated in order to devise criteria on the most suitable alloy for a specific application in a more deterministic way. In the present paper, results on the oxidation behaviour of UNS S31600 stainless steel and its main constituent elements (Fe, Cr and Ni) in supercritical water (500–700 °C, 30 MPa) stemming from both in situ oxide film resistance and impedance measurements and ex situ microscopic and spectroscopic analyses are presented. They are discussed within the frames of an approach combining thermodynamic and kinetic considerations from both aqueous electrochemistry at subcritical temperatures and gas/steam oxidation of compatible materials in the relevant temperature range. Tentative conclusions concerning the temperature limits of applicability of Pourbaix and Ellingham diagrams for the thermodynamic description of corrosion have been drawn.",
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Surface film electrochemistry of austenitic stainless steel and its main constituents in supercritical water. / Betova, Iva; Bojinov, Martin; Kinnunen, Petri; Penttilä, Sami; Saario, Timo.

In: Journal of Supercritical Fluids, Vol. 43, No. 2, 2007, p. 333-340.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Surface film electrochemistry of austenitic stainless steel and its main constituents in supercritical water

AU - Betova, Iva

AU - Bojinov, Martin

AU - Kinnunen, Petri

AU - Penttilä, Sami

AU - Saario, Timo

PY - 2007

Y1 - 2007

N2 - Supercritical water is used as a solvent and reagent for the decomposition of toxic and hazardous wastes, and is also considered as a prospective coolant in fossil fuel and new generation nuclear power plants. In that respect, mechanisms of corrosion of candidate reactor materials in supercritical water remain to be elucidated in order to devise criteria on the most suitable alloy for a specific application in a more deterministic way. In the present paper, results on the oxidation behaviour of UNS S31600 stainless steel and its main constituent elements (Fe, Cr and Ni) in supercritical water (500–700 °C, 30 MPa) stemming from both in situ oxide film resistance and impedance measurements and ex situ microscopic and spectroscopic analyses are presented. They are discussed within the frames of an approach combining thermodynamic and kinetic considerations from both aqueous electrochemistry at subcritical temperatures and gas/steam oxidation of compatible materials in the relevant temperature range. Tentative conclusions concerning the temperature limits of applicability of Pourbaix and Ellingham diagrams for the thermodynamic description of corrosion have been drawn.

AB - Supercritical water is used as a solvent and reagent for the decomposition of toxic and hazardous wastes, and is also considered as a prospective coolant in fossil fuel and new generation nuclear power plants. In that respect, mechanisms of corrosion of candidate reactor materials in supercritical water remain to be elucidated in order to devise criteria on the most suitable alloy for a specific application in a more deterministic way. In the present paper, results on the oxidation behaviour of UNS S31600 stainless steel and its main constituent elements (Fe, Cr and Ni) in supercritical water (500–700 °C, 30 MPa) stemming from both in situ oxide film resistance and impedance measurements and ex situ microscopic and spectroscopic analyses are presented. They are discussed within the frames of an approach combining thermodynamic and kinetic considerations from both aqueous electrochemistry at subcritical temperatures and gas/steam oxidation of compatible materials in the relevant temperature range. Tentative conclusions concerning the temperature limits of applicability of Pourbaix and Ellingham diagrams for the thermodynamic description of corrosion have been drawn.

KW - Stainless steel

KW - Supercritical water

KW - Corrosion layer

KW - Ex situ analysis

KW - Electrochemical impedance spectroscopy

U2 - 10.1016/j.supflu.2007.06.005

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M3 - Article

VL - 43

SP - 333

EP - 340

JO - Journal of Supercritical Fluids

JF - Journal of Supercritical Fluids

SN - 0896-8446

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