I've read that aluminium on its own can be a superconductor. However can it still be one if it is mixed with another metal as an alloy?
Your question is confusing. There is no compound called aluminium acid. Aluminium metal will react with acids such as hydrochloric acid (HCl) to form aluminium chloride: 2Al + 6HCl → 2AlCl3 + 3H2 Also you can react aluminium with sulphuric acid, and get aluminium sulphate: 2Al + 3 H2SO4 → Al2(SO4)3 + 3H2 But not aluminium acid.
Aluminum by itself is very weak superconductor. If I recall it correctly, its critical temperature is 150 mK. Usually alloys of two or more superconductors are better superconductors than each of the components. Aluminum will probably improve as semiconductor a great deal if something like Sn is mixed in.
