Aluminum does not rust. Alumininum can also be anodized to keep it from corroding when salt and other contaminats get on it.
If they are an alloy, they will eventually rust.
Under most conditions aluminum will not rust in water. However, if the aluminum is alloyed with another metal, oxidation (rusting) could take place.
How long will it t take a quarter to rust in fresh water
Aluminium doesn't rust, ever. But it can corrode, which is similar. Anodising offers some protection, but it's all down to how bad the environment is. Bad enough, and any metal will take damage.
As long as you take proper care of them they should last you quite some time. Since aluminum is lightweight and can typically withstand different weather conditions, you should be just fine.
a long time
It depends on the quality of the nail. If it is painted it Amy take long to rust. In general it may take a month or so for the nail to rust.
How long it takes for an aluminum can to biodegrade
a week it take or two
5 months
50 years
If you are talking about aluminum foil, it takes a very long time. Aluminum is already in its elemental form, so there is no 'compound' to break down. Aluminum does not rust or corrode under normal exposure to the environment. The small amount that oxides on on its surface act as an inhibitor to further oxidation. So, an aluminum foil that is buried in a dump would last longer than our lifetimes.