Kazuya ITAMI

Dissolution Rate of Phosphate Glasses in Hydrofluoric Acid -Development of Glasses Not Dissolved to Hydrofluoric Acid-

Kazumasa MATUSITA

Although glasses are corroded by hydrofluoric acid remarkably, there have been few investigation on the dissolution reaction between glasses and hydrofluoric acid.
In this study, phosphate glasses were soaked in hydrofluoric acid, and weight decrease was measured as a function of immersion time.
In 47 wt% hydrofluoric acid, the durability increases in the order of the 50CaO-50P2O5 glass, silica glass(reference glass), 50ZnO-50P2O5 glass(mole ratio). Fluorides are formed by reaction of glasses with hydrofluoric acid. It was found that resistivity of glasses to hydrofluoric acid was determined by thermo dynamic stability of fluorides, CaF2, ZnF2, PF5, SiF4.
Based on stability of fluorides, it is succeeded in preparing multi component phosphate glasses which have high resistance to hydrofluoric acid.

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