Aluminum is pretty terrible with salt. Chloride disrupts the surface layer. Cool experiment to prove it: put copper sulfate (bright blue root killer crystals,

Aluminum is pretty terrible with salt. Chloride disrupts the surface layer. Cool experiment to prove it: put copper sulfate (bright blue root killer crystals, available in the plumbing section of a hardware store) in water until you get a blue solution. Add aluminum foil. Observe that there is no reaction. Add chloride (table salt or hydrochloric acid) and watch the reaction start. (you get copper powder)