It doesn't...........I’m curious how aluminum holds up to acids.
The funny thing is, even though I said Aluminum is rust resistant, it technically isn't. Aluminum actually rusts almost immediately upon contact with air and forms a very durable oxide layer(rust). Unlike Iron rust, Aluminum rust is quite stable however, and this is why it's considered very rust resistant.
The problem between Acids and Metals is that many Acids strip the Oxide Layer(rust) off, exposing fresh metal which can then rust again. That cycle continues when Metals are in the presence of Acid. Aluminum is pretty susceptible to Acids and certain Salts. Calcium Chloride, the salt they spray on in winter, is quite harmful to Aluminum. Mercury and Gallium will dissolve Aluminum in a way, infiltrating the molecular structure and creating a very brittle, porous alloy.