Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation

It has been pointed out that high concentration dissolved hydrogen is one of the important factors of PWSCC (primary water stress corrosion cracking) in the primary systems of pressurized water reactors. Application of a substitution for hydrogen may be a fundamental countermeasure of PWSCC. The aut...

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Autores principales:	Masafumi DOMAE, Kosho HOJO, Wataru SUGINO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	pressurized water reactor corrosion zircaloy-4 high temperature methanol gamma-irradiation weight change oxide film thickness hydrogen storage Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/c9947efed91a4dd3836f6013d154d0cc
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spelling	oai:doaj.org-article:c9947efed91a4dd3836f6013d154d0cc2021-11-26T06:09:52ZCorrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation2187-974510.1299/mej.2014tep0023https://doaj.org/article/c9947efed91a4dd3836f6013d154d0cc2014-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/4/1_2014tep0023/_pdf/-char/enhttps://doaj.org/toc/2187-9745It has been pointed out that high concentration dissolved hydrogen is one of the important factors of PWSCC (primary water stress corrosion cracking) in the primary systems of pressurized water reactors. Application of a substitution for hydrogen may be a fundamental countermeasure of PWSCC. The authors are developing a new water chemistry technology of a hydrogen alternative to suppress PWSCC. In the present paper, corrosion tests of Zircaloy-4 were performed in deaerated 5x10-3 mol dm-3 methanol solution at 320 °C in the absence and presence of gamma-irradiation. The nominal absorbed dose of the test water was 100 kGy. After the immersion tests, the specimens were analyzed. Weight gain per unit surface area, thickness of oxide film and hydrogen storage were measured. In addition, Raman spectroscopy was carried out, to investigate possible deposition of organic compounds on surface of the specimens. The corrosion behavior of Zircaloy-4 without irradiation agreed with literature data. It was concluded that the presence of methanol did not affect the corrosion behavior of Zircaloy-4. The corrosion behavior of Zircaloy-4 hardly depended on 100 kGy gamma-irradiation. On the Raman spectra of the specimens after the immersion tests, the Raman peaks ascribed to polyethylene or graphite were not found. The deposit of decomposition products of methanol would be negligible if any. It seems that polymerization is not the major process in thermal decomposition and radiolysis of methanol, but methanol decomposes into CO2 or carboxylic acids.Masafumi DOMAEKosho HOJOWataru SUGINOThe Japan Society of Mechanical Engineersarticlepressurized water reactorcorrosionzircaloy-4high temperaturemethanolgamma-irradiationweight changeoxide film thicknesshydrogen storageMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 4, Pp TEP0023-TEP0023 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	pressurized water reactor corrosion zircaloy-4 high temperature methanol gamma-irradiation weight change oxide film thickness hydrogen storage Mechanical engineering and machinery TJ1-1570
spellingShingle	pressurized water reactor corrosion zircaloy-4 high temperature methanol gamma-irradiation weight change oxide film thickness hydrogen storage Mechanical engineering and machinery TJ1-1570 Masafumi DOMAE Kosho HOJO Wataru SUGINO Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
description	It has been pointed out that high concentration dissolved hydrogen is one of the important factors of PWSCC (primary water stress corrosion cracking) in the primary systems of pressurized water reactors. Application of a substitution for hydrogen may be a fundamental countermeasure of PWSCC. The authors are developing a new water chemistry technology of a hydrogen alternative to suppress PWSCC. In the present paper, corrosion tests of Zircaloy-4 were performed in deaerated 5x10-3 mol dm-3 methanol solution at 320 °C in the absence and presence of gamma-irradiation. The nominal absorbed dose of the test water was 100 kGy. After the immersion tests, the specimens were analyzed. Weight gain per unit surface area, thickness of oxide film and hydrogen storage were measured. In addition, Raman spectroscopy was carried out, to investigate possible deposition of organic compounds on surface of the specimens. The corrosion behavior of Zircaloy-4 without irradiation agreed with literature data. It was concluded that the presence of methanol did not affect the corrosion behavior of Zircaloy-4. The corrosion behavior of Zircaloy-4 hardly depended on 100 kGy gamma-irradiation. On the Raman spectra of the specimens after the immersion tests, the Raman peaks ascribed to polyethylene or graphite were not found. The deposit of decomposition products of methanol would be negligible if any. It seems that polymerization is not the major process in thermal decomposition and radiolysis of methanol, but methanol decomposes into CO2 or carboxylic acids.
format	article
author	Masafumi DOMAE Kosho HOJO Wataru SUGINO
author_facet	Masafumi DOMAE Kosho HOJO Wataru SUGINO
author_sort	Masafumi DOMAE
title	Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
title_short	Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
title_full	Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
title_fullStr	Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
title_full_unstemmed	Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation
title_sort	corrosion behavior of zircaloy-4 in aqueous solution of methanol at 320ºc under gamma-irradiation
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/c9947efed91a4dd3836f6013d154d0cc
work_keys_str_mv	AT masafumidomae corrosionbehaviorofzircaloy4inaqueoussolutionofmethanolat320ocundergammairradiation AT koshohojo corrosionbehaviorofzircaloy4inaqueoussolutionofmethanolat320ocundergammairradiation AT watarusugino corrosionbehaviorofzircaloy4inaqueoussolutionofmethanolat320ocundergammairradiation
_version_	1718409807569879040

Corrosion behavior of Zircaloy-4 in aqueous solution of methanol at 320ºC under gamma-irradiation

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