Corrosion of the International Simple Glass under acidic to hyperalkaline conditions

BACKHOUSE, Daniel, FISHER, Adam J, NEEWAY, James J, CORKHILL, Claire L, HYATT, Neil C and HAND, Russell J (2018). Corrosion of the International Simple Glass under acidic to hyperalkaline conditions. npj Materials Degradation, 2 (29).

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Official URL: https://www.nature.com/articles/s41529-018-0050-5
Open Access URL: https://www.nature.com/articles/s41529-018-0050-5.... (Published version)
Link to published version:: https://doi.org/10.1038/s41529-018-0050-5

Abstract

Assessment of glass dissolution kinetics, under disposal relevant temperature and pH environments, is required to credibly estimate radionuclide release rates from vitrified radioactive waste. Leaching of the International Simple Glass (ISG) under acidic to hyperalkaline conditions was examined. Forward rate measurements have been obtained using the dynamic leaching SPFT protocol and rate parameters for B, Na and Si in the basic regime; errors in rates predicted using these parameters at high pH and temperature are significant because the fitting uses logarithmic data. Longer term behaviour under hyperalkaline conditions, representative of some disposal environments, was investigated using the PCT and MCC-1 static leaching protocols with Ca(OH)2 solutions for up to 120 days (PCT) and 720 days (MCC-1). In hyperalkaline conditions dissolution was incongruent for all elements and the presence of alternating zirconia-rich and zirconia-poor alteration layers was observed on all leached monoliths, indicating the occurrence of a self-organisation phenomenon during leaching.

Item Type: Article
Identification Number: https://doi.org/10.1038/s41529-018-0050-5
SWORD Depositor: Symplectic Elements
Depositing User: Symplectic Elements
Date Deposited: 23 Nov 2018 11:08
Last Modified: 23 Nov 2018 11:15
URI: http://shura.shu.ac.uk/id/eprint/23365

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