If alloys are homogeneous mixtures, why can't we separate their components?
If you melt the alloy and then use electrolysis, or if you use a redox reaction, you should be able to separate the components.

For example, if you used a basic acid, let's say hydrochloric acid, on a zinc-copper alloy, I'd imagine the zinc would be removed from the alloy and taking the hydrogen's place, forming zinc chloride, leaving hydrogen gas and copper metal.

This is based off of simple redox reaction memories and no personal experience. However, if you're curious, try it out!