When aluminium is exposed to the air, this overactive metal promptly reacts with the atmospheric oxygen to form aluminium oxide, which is a sticky natured compound of the same colour.
Thus, the aluminium protects itself from any corrosion by the formation of a layer of aluminium oxide over the entire metal surface and thus, aluminium is termed as a self-protecting metal
Read more on Brainly.in - https://brainly.in/question/1015152#readmore