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Radiation induced corrosion of copper in humid air and argon
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0002-8341-094X
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.
KTH, Skolan för kemivetenskap (CHE), Kemi, Yt- och korrosionsvetenskap.ORCID-id: 0000-0002-9453-1333
KTH, Skolan för kemivetenskap (CHE), Kemi, Tillämpad fysikalisk kemi.ORCID-id: 0000-0003-0663-0751
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
Identifikatorer
URN: urn:nbn:se:kth:diva-175816OAI: oai:DiVA.org:kth-175816DiVA, id: diva2:862477
Merknad

QS 2015

Tilgjengelig fra: 2015-10-22 Laget: 2015-10-22 Sist oppdatert: 2015-10-22bibliografisk kontrollert
Inngår i avhandling
1. Radiation induced corrosion of copper
Åpne denne publikasjonen i ny fane eller vindu >>Radiation induced corrosion of copper
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The process of radiation induced corrosion of copper is not well understood. The most obvious situation where the knowledge of this process is crucial is in a deep repository for high level spent nuclear fuel where the fuel will be sealed inside copper canisters. The radiation will penetrate the canisters and be absorbed by the surrounding environment. In this study gamma irradiations of polished and pre-oxidized copper cubes in anoxic pure water, air of 60-100 % RH and in humid argon were performed. The copper surfaces were examined using IRAS, XPS, cathodic reduction, SEM, AFM, and Raman spectroscopy. The concentration of copper in the reaction solutions was measured using ICP-OES.  Also the formation of oxidative species caused by radiation absorption of water was studied by numerical simulations using MAKSIMA software. The corrosion of copper during gamma irradiation vastly exceeds what is expected. The production of oxidative species caused by radiation absorption of water is hundreds of times too low to explain the amount of oxidized copper. A possible explanation for this mismatch is an enhanced radiation chemical yield of HO· on the copper surface. Another one is an increased surface area due to oxidation of copper. One speculation is that HO· interacting with the copper oxide can cause oxidation of the metal. If the thermodynamic driving force is large enough then electrons can be conducted from the metal through the oxide to the oxidant. A dramatic increase in surface area together with an increased interfacial yield of HO· might explain the radiation enhanced corrosion process.   

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2015. s. vii, 77
Serie
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:57
Emneord
Corrosion, oxidation, copper, copper oxide, gamma radiation, radiolysis, hydrogen peroxide, hydroxyl radical
HSV kategori
Forskningsprogram
Kemi
Identifikatorer
urn:nbn:se:kth:diva-175739 (URN)978-91-7595-710-4 (ISBN)
Disputas
2015-11-18, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad

QC 20151022

Tilgjengelig fra: 2015-10-22 Laget: 2015-10-20 Sist oppdatert: 2015-10-22bibliografisk kontrollert

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