Aluminium has a very useful property that is in presence of moist air it combines with oxygen and then forms aluminium oxide.this oxide of aluminium forms a whitish coating on the utensils when helps it from reacting further with oxygen and protects the utensils from corrosion(here corrosion means oxidative deterioration of metal).so still it can be used for making utensils

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Whenever Aluminium reacts with 0xygen, it forms Aluminium Oxide... When this happens in utensils the Aluminium Oxide comes in the formorning of a layer which actually prevents corrosion. ... That is the reason why. ... Pleeeease mark as best