Question

corrosion is sometimes advantages comment.

Answer 1

Here are some advantages of corrosion: urface corrosion forms an oxide layer. It acts as a barrier for air and moisture and thereby preventing the inner metal from corrosion. Some metals like zinc act as sacrificial anodes to prevent corrosion to other metals.

Answer 2

Corrosion is sometimes advantageous. comment.

Although metals like aluminium, chromium & zinc are more electropositive & therefore, they would corrode more readily than iron but the oxide initially produced forms are coating that protect the metal from further corrosion.

Therefore, we can say that sometimes corrosion is useful.