It really has not much to do with solubolizing but oxidation and corrosion of the Al for seawater which is dependent on its alloys and how it is treated. A jist of it here
"Anything ferrous exposed to saltwater or salt atmosphere will
deteriorate very quickly. Saltwater will also have a deleterious
effect on non-ferrous metals like aluminum. They are subject to
corrosion and eventually become brittle. Aluminum cans thrown into
saltwater will completely dissolve in a very short time. Zinc-coated
(galvanized) surfaces will eventually yield to corrosive elements if
not properly maintained. "
There are annuals of documents on the corrosion of Al in seawater. Just think Al boats
aluminum boats and salt water
http://www.stripersonline.com/surftalk/showthread.php?t=502868
If you can keep it free from spray water and collecting water form humidity it should fine. Meaning, take care of it. Again many Al are fine but others are not, it is the Alloy of Al it is.