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I need to know what you mean by aluminum being resistant to corrosion does this mean that eventually it will rust and how long does this take, under what conditions?

Aluminium does not rust. Under normal circumstances a thin layer of oxide forms on the surface of aluminium metal on contact with air protecting the metal beneath from further corrosion. In adverse weather conditions or due to other environmental factors the corrosion pattern of aluminium is more complex. Without more information it is not possible to put a time on this process. For more information on aluminum corrosion we would suggest you contact a technical body such as a metallurgical department of a university.