Electrochemical and microstructural characterization of alloy 600 in low pressure H2-Steam

L. Volpe; G. Bertali; M. Curioni; M. G. Burke; F. Scenini

doi:10.1007/978-3-319-67244-1_26

Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam

L. Volpe
, G. Bertali
, M. Curioni
, M. G. Burke
, F. Scenini

Nuclear Materials Performance

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Scopus citations

Abstract

Low pressure superheated H₂-steam system has been extensively used in the past years to accelerate the oxidation kinetics while keeping the conditions representative to PWR primary water. One of the most important requirements of this environment is that needs to replicate the Ni/NiO transition. However, despite several studies have been carried out by different research groups in H₂-steam environment, there is still some level of uncertainty over the thermodynamic of the oxidation process. In this study, the Ni/NiO transition in hydrogenated steam was investigated via electrochemical potential measurements using a Ni/NiO solid state reference electrode. Furthermore, solution annealed Alloy 600 coupons were exposed to H₂-steam at 480, ℃ in order to examine the effect of oxidizing conditions with respect to the Ni/NiO transition on the preferential intergranular oxidation. The effect of the redox potential on the preferential intergranular oxidation is discussed in the context of the precursor stages of stress corrosion cracking for Alloy 600.

Original language	English
Title of host publication	Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
Editors	Denise Paraventi, Michael Wright, John H. Jackson
Publisher	Springer International Publishing
Pages	409-422
Number of pages	14
ISBN (Print)	9783319672434
DOIs	https://doi.org/10.1007/978-3-319-67244-1_26
State	Published - 2018
Event	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States Duration: Aug 13 2017 → Aug 17 2017

Publication series

Name	Minerals, Metals and Materials Series
Volume	Part F9
ISSN (Print)	2367-1181
ISSN (Electronic)	2367-1696

Conference

Conference	18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
Country/Territory	United States
City	Portland
Period	08/13/17 → 08/17/17

Keywords

Alloy 600
Grain boundary migration
Ni/NiO
Preferential intergranular oxidation
Redox potential

Access to Document

10.1007/978-3-319-67244-1_26

Cite this

Volpe, L., Bertali, G., Curioni, M., Burke, M. G., & Scenini, F. (2018). Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam. In D. Paraventi, M. Wright, & J. H. Jackson (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (pp. 409-422). (Minerals, Metals and Materials Series; Vol. Part F9). Springer International Publishing. https://doi.org/10.1007/978-3-319-67244-1_26

Volpe, L. ; Bertali, G. ; Curioni, M. et al. / Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam. Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. editor / Denise Paraventi ; Michael Wright ; John H. Jackson. Springer International Publishing, 2018. pp. 409-422 (Minerals, Metals and Materials Series).

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abstract = "Low pressure superheated H2-steam system has been extensively used in the past years to accelerate the oxidation kinetics while keeping the conditions representative to PWR primary water. One of the most important requirements of this environment is that needs to replicate the Ni/NiO transition. However, despite several studies have been carried out by different research groups in H2-steam environment, there is still some level of uncertainty over the thermodynamic of the oxidation process. In this study, the Ni/NiO transition in hydrogenated steam was investigated via electrochemical potential measurements using a Ni/NiO solid state reference electrode. Furthermore, solution annealed Alloy 600 coupons were exposed to H2-steam at 480, ℃ in order to examine the effect of oxidizing conditions with respect to the Ni/NiO transition on the preferential intergranular oxidation. The effect of the redox potential on the preferential intergranular oxidation is discussed in the context of the precursor stages of stress corrosion cracking for Alloy 600.",

keywords = "Alloy 600, Grain boundary migration, Ni/NiO, Preferential intergranular oxidation, Redox potential",

author = "L. Volpe and G. Bertali and M. Curioni and Burke, \{M. G.\} and F. Scenini",

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Volpe, L, Bertali, G, Curioni, M, Burke, MG & Scenini, F 2018, Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam. in D Paraventi, M Wright & JH Jackson (eds), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Minerals, Metals and Materials Series, vol. Part F9, Springer International Publishing, pp. 409-422, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Portland, United States, 08/13/17. https://doi.org/10.1007/978-3-319-67244-1_26

Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam. / Volpe, L.; Bertali, G.; Curioni, M. et al.
Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. ed. / Denise Paraventi; Michael Wright; John H. Jackson. Springer International Publishing, 2018. p. 409-422 (Minerals, Metals and Materials Series; Vol. Part F9).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Volpe, L.

AU - Bertali, G.

AU - Curioni, M.

AU - Burke, M. G.

AU - Scenini, F.

N1 - Publisher Copyright: © The Minerals, Metals & Materials Society 2018.

PY - 2018

Y1 - 2018

N2 - Low pressure superheated H2-steam system has been extensively used in the past years to accelerate the oxidation kinetics while keeping the conditions representative to PWR primary water. One of the most important requirements of this environment is that needs to replicate the Ni/NiO transition. However, despite several studies have been carried out by different research groups in H2-steam environment, there is still some level of uncertainty over the thermodynamic of the oxidation process. In this study, the Ni/NiO transition in hydrogenated steam was investigated via electrochemical potential measurements using a Ni/NiO solid state reference electrode. Furthermore, solution annealed Alloy 600 coupons were exposed to H2-steam at 480, ℃ in order to examine the effect of oxidizing conditions with respect to the Ni/NiO transition on the preferential intergranular oxidation. The effect of the redox potential on the preferential intergranular oxidation is discussed in the context of the precursor stages of stress corrosion cracking for Alloy 600.

AB - Low pressure superheated H2-steam system has been extensively used in the past years to accelerate the oxidation kinetics while keeping the conditions representative to PWR primary water. One of the most important requirements of this environment is that needs to replicate the Ni/NiO transition. However, despite several studies have been carried out by different research groups in H2-steam environment, there is still some level of uncertainty over the thermodynamic of the oxidation process. In this study, the Ni/NiO transition in hydrogenated steam was investigated via electrochemical potential measurements using a Ni/NiO solid state reference electrode. Furthermore, solution annealed Alloy 600 coupons were exposed to H2-steam at 480, ℃ in order to examine the effect of oxidizing conditions with respect to the Ni/NiO transition on the preferential intergranular oxidation. The effect of the redox potential on the preferential intergranular oxidation is discussed in the context of the precursor stages of stress corrosion cracking for Alloy 600.

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ER -

Volpe L, Bertali G, Curioni M, Burke MG, Scenini F. Electrochemical and microstructural characterization of alloy 600 in low pressure H₂-Steam. In Paraventi D, Wright M, Jackson JH, editors, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Springer International Publishing. 2018. p. 409-422. (Minerals, Metals and Materials Series). doi: 10.1007/978-3-319-67244-1_26