Raw aluminum in salt air, (tropical island, coastal areas) will corrode and be damaged. it will continue to get worse.
IE it does not form a thin layer, but more like rust on iron, continues to penetrate the surface to depth.
Anodizing helps, and for most environments will prevent corrosion. However in a very salty air humid environment the corrosion will still take place eventually unless the surface is kept polished with a coating of wax.
In most non-salt air places, the corrosion forms only a thin layer and stops.
Aluminum wheels in Northern areas where salt is placed on the road suffer the same, unless covered with a good layer of clearcoat.
IE it does not form a thin layer, but more like rust on iron, continues to penetrate the surface to depth.
Anodizing helps, and for most environments will prevent corrosion. However in a very salty air humid environment the corrosion will still take place eventually unless the surface is kept polished with a coating of wax.
In most non-salt air places, the corrosion forms only a thin layer and stops.
Aluminum wheels in Northern areas where salt is placed on the road suffer the same, unless covered with a good layer of clearcoat.