Flexi Says: Aluminum reacts with oxygen to form aluminum oxide, which remains tightly packed on the surface. The aluminum oxide prevents the interior of the aluminum from corroding. Conversely, the iron oxides that form during the corrosion of iron form a surface that flakes off easily rather than remaining tight to the surface. This allows the iron to corrode completely through until the iron object is destroyed. Also Aluminum is a better conductor of electricity and more ductile than iron. For these reasons Aluminum has better usability than iron.
