Selection of Binders for a Reactive Metal (Tungsten) Encapsulation - 17211
- CEA, DEN, DTCD, SPDE, LP2C F-30207 Bagnols Sur Ceze (France)
- CEA, DEN, DSN, SGTD, LMDE F-13115 Saint-Paul lez Durance (France)
Waste containing reactive metals is produced by nuclear activities, and the usual strategy is to encapsulate this waste in ordinary Portland cement (OPC) or alternative binders in a state suitable for storage. However, in the case of tungsten metal, corrosion by the pore solution of the binders could occur with hydrogen release. Based on Potential-pH diagram, tungsten metal corrosion depends on pH conditions. Consequently, studies have been performed with tungsten in a large pH scale relevant for various binders such as ordinary Portland cement (OPC), sodium geo-polymer (Na-Geo), magnesium-phosphate cement (MKP) and wollastonite-based cement (Wo). The influence of representative pore solutions of OPC, Na-Geo, MKP and Wo on tungsten corrosion has been studied by electrochemical methods (Open Circuit Potential and impedance spectroscopy). The corrosion of tungsten encapsulated in OPC, Na-Geo, MKP and Wo has been investigated by measuring the production of hydrogen over time. It is shown that ordinary Portland cement is not a suitable binder for tungsten metal encapsulation while a binder producing a pore solution with a neutral pH such as MKP presents the lowest interaction with tungsten. (authors)
- Research Organization:
- WM Symposia, Inc., PO Box 27646, 85285-7646 Tempe, AZ (United States)
- OSTI ID:
- 22794599
- Report Number(s):
- INIS-US--19-WM-17211
- Country of Publication:
- United States
- Language:
- English
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