Degradation of partially immersed glass: A new perspective

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Title: Degradation of partially immersed glass: A new perspective
Authors: Chinnam, RK
Fossati, PCM
Lee, WE
Item Type: Journal Article
Abstract: The International Simple Glass (ISG) is a six-component borosilicate glass which was developed as a reference for international collaborative studies on high level nuclear waste encapsulation. Its corrosion behaviour is typically examined when it is immersed in a leaching solution, or when it is exposed to water vapour. In this study, an alternative situation is considered in which the glass is only partially immersed for 7 weeks at a temperature of 90ºC. In this case, half of the glass sample is directly in the solution itself, and the other half is in contact with a water film formed by condensation of water vapour that evaporated from the solution. This results in a different degradation behaviour compared to standard tests in which the material is fully immersed. In particular, whilst in standard tests the system reaches a steady state with a very low alteration rate thanks to the formation of a protective gel layer, in partially-immersed tests this steady state could not be reached because of the continuous alteration from the condensate water film. The constant input of ions from the emerged part of the sample caused a supersaturation of the solution, which resulted in early precipitation of secondary crystalline phases. This setup mimics storage conditions once small amounts of water have entered a glass waste form containing canister. It offers a more realistic outlook of corrosion mechanisms happening in such situations than standard fully-immersed corrosion tests.
Issue Date: 1-May-2018
Date of Acceptance: 26-Feb-2018
URI: http://hdl.handle.net/10044/1/57539
DOI: https://dx.doi.org/10.1016/j.jnucmat.2018.02.040
ISSN: 0022-3115
Publisher: Elsevier
Start Page: 56
End Page: 65
Journal / Book Title: Journal of Nuclear Materials
Volume: 503
Copyright Statement: © 2018 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/L014041/1
Keywords: Science & Technology
Technology
Materials Science, Multidisciplinary
Nuclear Science & Technology
Materials Science
NUCLEAR-WASTE GLASSES
CALCIUM SILICATE HYDRATE
90 DEGREES-C
VAPOR HYDRATION
UNSATURATED CONDITIONS
AQUEOUS CORROSION
SURFACE-LAYERS
HIGH-LEVEL
DISSOLUTION
WATER
0912 Materials Engineering
Energy
Publication Status: Published
Open Access location: https://doi.org/10.1016/j.jnucmat.2018.02.040
Online Publication Date: 2018-02-27
Appears in Collections:Faculty of Engineering
Materials
Faculty of Natural Sciences



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