Dissolving Ceramic With Acid

From my experience we needed to dissolve etched alumina on top of aluminum. So we mostly used a mixture of phosphoric acid 6 wt and chromic acid 1 8 wt at 50 o c. 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.

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Dissolving ceramic with acid.

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. I am a student and the sandblaster is currently being repaired so i am looking for a solution to this. Aluminium or light alloy e g. Stronger acids such as fluoroantimonic acid might be able to dissolv.

Examples include the commonly used pharmaceutical antidepressant medication fluoxetine prozac and the material ptfe teflon. There are many types of ceramics. A liquid free flowing flux which can dissolve the ceramic is only one part of a successful smelt albeit a big part. 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.

Ceramic core materials are selectively dissolved from light metal e g. Elemental fluorine is produced from it. It is commonly used to etch glass and silicon. Porcelain one of the stronger ceramics won t really react with any acid except hf hydrofluoric acid as you see in breaking bad.

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.

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