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Report No.
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Corrosion behavior of P0798 type simulated HLW glass in the presence of magnesium ion

Maeda, Toshikatsu; Omori, Hiroyuki; Mitsui, Seiichiro  

Static leach tests were conducted for P0798 type simulated HLW glass in magnesium chloride solution to investigate the effects of Mg ion on the glass corrosion. The glass corroded at higher rate under the condition that Mg ion exists in the leachate, while the rate dropped after the depletion of Mg ion in the leachate. Surface analyses showed that altered layer including Mg and Si was observed at the surface of the leached glass. The present results implied that corrosion of the glass with the higher rate occurred as dissolution of Si from the glass network accompanied with formation of magnesium silicates. Corrosion rate of the HLW glass would be low for long-term if cations forming silicate compounds are scarce in groundwater.

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