Behavior of B in passivating gels formed on International Simple Glass in acid and basic pH

The corrosion behavior of borosilicate glass in the presence of cementitious waste forms

“…This result was obtained by conducting adsorption experiments using silica and an aqueous solution of B(OH) 3 at 7000 mg L −1 for B, and CaCl 2 at 7000 mg L −1 for Ca. 64 These concentrations are almost two orders of magnitude larger than the concentrations used in this study; therefore, the results might not be as pronounced.…”

On the effect of Al on alumino-borosilicate glass chemical durability

“…The case of SBNA1 is of great interest because its alteration ceases -or at least becomes extremely slow -during the course of the experiment and some B is detected in the gel. Recent work has shown that the retention of B in the gel retroacts on the continuation of the glass alteration reaction, not through water diffusion as it was suspected before 26 but more likely through further hydrolysis of B-O-Si linkages and diffusion of B aq 19 . In that particular case, it can be proposed that the fast reorganization of the gel, highly permitted by the low concentration of Al, favors B retention in the inner region of the gel, which in turn dramatically reduce the rate at which glass continues to corrode.…”

“…In most cases, this assumption is assumed to be valid but is not veri ed. Recently, we demonstrated that i) in some circumstances, B can be retained in the gel layer and that this retention could impact the rate of glass alteration 6 , ii) B diffusion coe cients in gels are low (~ 10 − 20 m 2 .s − 1 in gel of ISG formed at pH 9) 19 , iii) B retention and diffusion in gels strongly depend on the pH and the presence of Ca 19 .…”

“…The way to calculate this curve is explained in a former paper 19 . For SBNA1 the porosity decreases toward the glass because of the retention of B in the gel.…”