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...Steel in question is MIL-A-12560 grade steel plating, and the amount of fluoroantimonic acid is a kilogram.
Thanks for the very informative answer! It does, however, leave me with one followup question. Would it be possible using any acid to dissolve a circular (Or cubic, it's not really important) hole 5 centimeters deep with a diameter of 1 centimeter using any combination of acids or electrical currents in under 10 minutes? It's only 5 cm2, however it is 5 centimeters deep and from what I've found many acids tend to act rather slowly. For simplicity's sake assume there are no limitations on the electrical current or amount of acid we could apply.