Chemistry question on aluminum

There is little chance that any aluminium used in commercial audio products is in its 'raw' state.....ie...unprotected.
At the very least, a chromate coating is the cheapest but anodising is generally the most economically available product and is available in a range of colors and thicknesses (the thicker the coating...say 25 microns...gives added protection).
Powder coating of aluminium is generally cheaper than anodizing these days and is available in hundreds of colours compared to the limited range with adodising.
Powder coating provides greater protection against the corrosion of salt being a paint sealant rather than a chemical deposit as in anodising.
Anodised aluminium WILL be eaten away by salt near a marine environment and even with powder coating......any weakness in joints, edges, drilled fixing holes etc will be attacked thus making any form of aluminium in a marine environment very risky.
Two-pack polyurethane is another protective coating which can be used over aluminium but stainless steel, zinc, copper and even galvanized steel are preferable for coastal environments.
Heat and humidity in themselves will not affect any commercially protected aluminium products.

I've seen aluminum body work on cars corrode away exactly like rusty steel. The probable reason you don't see it to that extent on wheels is because they are made with alloys of aluminum, not pure. Same goes for audio component cases, I would think for the sake of durability. Although certain types of racing wheels are typically pure aluminum/magnesium.

Thank you everyone for corroding away my paranoia. ;p