Abstract
The aqueous corrosion behavior of glasses from two heavy‐metal fluoride families (ZrF4‐based and BaF2‐ThF4‐based) was studied as a function of controlled solution pH and of glass composition. Leach test results demonstrate a profound pH dependence of corrosion over the range pH 2 to 13. Whereas the glasses readily undergo congruent matrix dissolution in acidic media, they exhibit a marked increase in chemical durability in neutral and basic solutions, with the optimum aqueous environment occurring near pH 7. Results of this study are discussed and compared with results reported earlier for leach tests of these two compositional families in unbuffered de‐ionized water. In addition, several testing methods, both static and dynamic, are described and point to the importance of appropriate test selection in predicting the corrosion resistance of these glasses over prolonged periods.
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