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International Journal of CorrosionVolume 2011 2011, Article ID 796457, 6 pages

Research Article

Nuclear Safety Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan

Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1194, Japan

Received 13 May 2011; Accepted 5 July 2011

Academic Editor: Michael I. Ojovan

Copyright © 2011 Toshikatsu Maeda et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Static leach tests were conducted for simulated HLW glass in MgCl2 solution for up to 92 days to investigate the dissolution mechanism of HLW glass under coastal repository condition. Under the condition that magnesium ion exists in leachate, the dissolution rate of the glass did not decrease with time during leaching, while the rate decreased when the magnesium ion depleted in the leachate. In addition, altered layer including magnesium and silica was observed at the surface of the glass after the leach tests. The present results imply that dissolution of the glass is accompanied with formation of magnesium silicate consuming silica, a glass network former. As a consequence, the glass dissolved with an initial high dissolution rate.





Autor: Toshikatsu Maeda, Hiroyuki Ohmori, Seiichiro Mitsui, and Tsunetaka Banba

Fuente: https://www.hindawi.com/



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