Heating impact on corrosion mechanism of carbon steel surrounded by bentonite

The long-term safety of geological disposal of radioactive waste is studied through several simulations. Before underground disposal, radioactive waste is stored for 30 to 50 years at facilities near nuclear power plants to cool it down to around 100 degrees Celsius. It is then placed in steel canis...

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Autores principales:	Masao UYAMA, Hiroyuki SAITO, Tomoya IIOKA
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2021
Materias:	radioactive waste corrosion carbon steel bentonite eis Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/1cf00dc37ce14da2b1b7901605fb7a59
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spelling	oai:doaj.org-article:1cf00dc37ce14da2b1b7901605fb7a592021-11-29T06:09:58ZHeating impact on corrosion mechanism of carbon steel surrounded by bentonite2187-974510.1299/mej.20-00492https://doaj.org/article/1cf00dc37ce14da2b1b7901605fb7a592021-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/8/4/8_20-00492/_pdf/-char/enhttps://doaj.org/toc/2187-9745The long-term safety of geological disposal of radioactive waste is studied through several simulations. Before underground disposal, radioactive waste is stored for 30 to 50 years at facilities near nuclear power plants to cool it down to around 100 degrees Celsius. It is then placed in steel canisters surrounded by artificial materials such as bentonite and concrete. To determine the long-term safety and stability of this disposal method, we’ve studied the corrosion rate of the steel canisters under different conditions using electro-chemical impedance spectroscopy (EIS). This paper describes the corrosion of the carbon steel and elucidates the corroded condition using EIS measurement. EIS was adopted to estimate the corrosion condition from the impedance frequency characteristic. In our experiment, samples of bentonite and carbon steel were Kunigel V1 compacted to 1.37 Mg/m3 dry density with several different water contents, and SM400 as a low carbon steel. An electric heater was set inside the steel canister to maintain the temperature at 100 degrees Celsius. This model was made to a scale of around 1/120 as a current concept of a vertical disposal plan and reproduced the enclosed situation after underground emplacement of the radioactive waste. During heating, we conducted EIS measurements and set this data result as an equivalent circuit. We noted some different trends of impedance frequency characteristic depending on the bentonite’s water content and the heating time. From this result, we estimated the corrosion condition to analyze the corrosion products.Masao UYAMAHiroyuki SAITOTomoya IIOKAThe Japan Society of Mechanical Engineersarticleradioactive wastecorrosioncarbon steelbentoniteeisMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 8, Iss 4, Pp 20-00492-20-00492 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	radioactive waste corrosion carbon steel bentonite eis Mechanical engineering and machinery TJ1-1570
spellingShingle	radioactive waste corrosion carbon steel bentonite eis Mechanical engineering and machinery TJ1-1570 Masao UYAMA Hiroyuki SAITO Tomoya IIOKA Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
description	The long-term safety of geological disposal of radioactive waste is studied through several simulations. Before underground disposal, radioactive waste is stored for 30 to 50 years at facilities near nuclear power plants to cool it down to around 100 degrees Celsius. It is then placed in steel canisters surrounded by artificial materials such as bentonite and concrete. To determine the long-term safety and stability of this disposal method, we’ve studied the corrosion rate of the steel canisters under different conditions using electro-chemical impedance spectroscopy (EIS). This paper describes the corrosion of the carbon steel and elucidates the corroded condition using EIS measurement. EIS was adopted to estimate the corrosion condition from the impedance frequency characteristic. In our experiment, samples of bentonite and carbon steel were Kunigel V1 compacted to 1.37 Mg/m3 dry density with several different water contents, and SM400 as a low carbon steel. An electric heater was set inside the steel canister to maintain the temperature at 100 degrees Celsius. This model was made to a scale of around 1/120 as a current concept of a vertical disposal plan and reproduced the enclosed situation after underground emplacement of the radioactive waste. During heating, we conducted EIS measurements and set this data result as an equivalent circuit. We noted some different trends of impedance frequency characteristic depending on the bentonite’s water content and the heating time. From this result, we estimated the corrosion condition to analyze the corrosion products.
format	article
author	Masao UYAMA Hiroyuki SAITO Tomoya IIOKA
author_facet	Masao UYAMA Hiroyuki SAITO Tomoya IIOKA
author_sort	Masao UYAMA
title	Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
title_short	Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
title_full	Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
title_fullStr	Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
title_full_unstemmed	Heating impact on corrosion mechanism of carbon steel surrounded by bentonite
title_sort	heating impact on corrosion mechanism of carbon steel surrounded by bentonite
publisher	The Japan Society of Mechanical Engineers
publishDate	2021
url	https://doaj.org/article/1cf00dc37ce14da2b1b7901605fb7a59
work_keys_str_mv	AT masaouyama heatingimpactoncorrosionmechanismofcarbonsteelsurroundedbybentonite AT hiroyukisaito heatingimpactoncorrosionmechanismofcarbonsteelsurroundedbybentonite AT tomoyaiioka heatingimpactoncorrosionmechanismofcarbonsteelsurroundedbybentonite
_version_	1718407571884212224

Heating impact on corrosion mechanism of carbon steel surrounded by bentonite

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