Question

Example where corrosion is advantage not disadvantage

Answer 1

One example is the formation of aluminium oxide over the Aluminium ,which further protects the deteoration of Aluminium and act as barriier for air and moisture.

Answer 2

When aluminium reacts with oxygen, aluminium oxide is formed..... Which doesn't damage the metal rather acts as a barrier and protects it from air and moisture and prevents its deteoration