Dissolving Ceramic With Acid

There are many types of ceramics.

Dissolving ceramic with acid.

Aluminium or light alloy e g. Ceramic core materials are selectively dissolved from light metal e g. Hydrofluoric acid is a solution of hydrogen fluoride hf in water solutions of hf are colourless acidic and highly corrosive it is used to make most fluorine containing compounds. Elemental fluorine is produced from it.

I am a student and the sandblaster is currently being repaired so i am looking for a solution to this. The time depended on the. Molten naoh for more multiple material and for more precise stuff i use either 70 hf or the same with adding sulfuric acid and the more cruel and devastating way being molten oxone there are some disadvantages of the last. Examples include the commonly used pharmaceutical antidepressant medication fluoxetine prozac and the material ptfe teflon.

I need to dissolve ceramic shell from a bronze cast and i was wondering if there is a liquid solution available to remove the remaining shell. Stronger acids such as fluoroantimonic acid might be able to dissolv. Aluminium alloy castings which are themselves susceptible to attack by caustic alkali solutions by providing the core material with a substance containing hydrogen donor group which is capable of producing nascent hydrogen and contacting the core with fused anhydrous caustic alkalis. It is commonly used to etch glass and silicon.

So we mostly used a mixture of phosphoric acid 6 wt and chromic acid 1 8 wt at 50 o c.