Abstract
The iron-bentonite interface will be important with respect to the long-term performance of high-level radioactive waste (HLW) disposal sites. Magnetite and Fe-silicates form at this interface due to anoxic corrosion. The corrosion mechanism, however, is still under debate. In the present study two bentonites differing with respect to their content of reactive silica were compared using electron microscopy. The presence of reactive silica immediately led to the formation of Fe-silicates while magnetite prevailed in the other sample. These results confirm recently published conceptual models describing the corrosion and point towards the importance of considering reactive silica in this system.
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