Investigation of the long-term behaviour of HLW glass under conditions relevant to final storage
A theoretical study based on a broad set of corrosion data with different glasses and different corroding agents shows that all HLW glasses corrode according to very similar patterns. The main mechanisms can be summarised as follows: (i) the glass is submitted to a network dissolution process responsible for almost the total corrosion progress; (ii) as long as an accumulation of reaction products in the solution is avoided, the network dissolution rate has an initial value which is a function of the individual glass composition and of the activities of the corresponding species in solution; (iii) the dissolution rate slows down with increasing amounts of accumulated reaction products and finally reaches a long term rate; (iv) reaction products (eventually involving components of the attacking solution) form layers on top of the residual glass; (v) the reaction products layers in many cases act as transport barriers and reduce a further corrosion attack; (vi) the surface zone of the residual glass is altered by ion exchange processes.
Bibliographic Reference: EUR 13609 EN (1992) 81 pp., FS, ECU 7.50
ISBN: ISBN 92-826-3732-8
Record Number: 199210441 / Last updated on: 1994-12-02
Original language: en
Available languages: en