  Alkali and alkaline earth aluminoborate glasses feature high resistance to
cracking under sharp contact loading compared to other oxide glasses. However,
due to the high content of hygroscopic B2O3, it is expected that applications
of these glasses could be hindered by poor chemical durability in aqueous
solutions. Indeed, the compositional and structural dependence of their
dissolution kinetics remains unexplored. In this work, we correlate the
dissolution rates of aluminoborate glasses in acidic, neutral, and basic
solutions with the structural changes induced by varying the aluminum-to-boron
ratio. In detail, we investigate a total of seventeen magnesium, lithium, and
sodium aluminoborate glasses with fixed modifier content of 25 mol%. We show
that the structural changes induced by alumina depend on the network modifier.
We also demonstrate a correlation between the chemical durability at various pH
values and the structural changes in Mg-, Li- and Na- aluminoborate glasses.
The substitution of alumina by boron oxide leads to a general decrease of
chemical corrosion in neutral and acidic solutions. The lowest dissolution rate
value is observed in Mg-aluminoborate glasses, as a consequence of the
intermediate character of magnesium which can increase the network
cross-linking. For basic solutions, the chemical durability is almost constant
for the different amount of alumina in the three series, likely because B2O3 is
susceptible to nucleophilic attack, which is favored in high-OH- solutions.
