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The role of the oxide layerin radiation induced corrosion of copper in anoxic water
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0002-8341-094X
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Surface and Corrosion Science.ORCID iD: 0000-0002-9453-1333
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.ORCID iD: 0000-0003-0663-0751
(English)Manuscript (preprint) (Other academic)
Identifiers
URN: urn:nbn:se:kth:diva-175813OAI: oai:DiVA.org:kth-175813DiVA: diva2:862474
Note

QS 2015

Available from: 2015-10-22 Created: 2015-10-22 Last updated: 2015-10-22Bibliographically approved
In thesis
1. Radiation induced corrosion of copper
Open this publication in new window or tab >>Radiation induced corrosion of copper
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
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.   

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2015. vii, 77 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2015:57
Keyword
Corrosion, oxidation, copper, copper oxide, gamma radiation, radiolysis, hydrogen peroxide, hydroxyl radical
National Category
Physical Chemistry
Research subject
Chemistry
Identifiers
urn:nbn:se:kth:diva-175739 (URN)978-91-7595-710-4 (ISBN)
Public defence
2015-11-18, Kollegiesalen, Brinellvägen 8, KTH, Stockholm, 10:00 (English)
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Note

QC 20151022

Available from: 2015-10-22 Created: 2015-10-20 Last updated: 2015-10-22Bibliographically approved

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Björkbacka, ÅsaLeygraf, ChristoferJonsson, Mats

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