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What dissolves Al/Ti/Zr oxides?

There are many ways of dissolving the oxides of Al, Ti and Zr (alumina, titania and zirconia). There is no easy single answer, because the compounds can exist in different forms with different crystal structures and compositions.

However strong alkali (e.g. sodium hydroxide) will dissolve alumina, and probably the others. HF is also reported to dissolve titania and zirconia. Beware that these are all dangerous chemicals!

by Professor Peter Goodhew