Question

What are the advantages and disadvantages of corrosion?!

Answer 1

in my view as micro-organisms cant decomposite the metals so corrosion is necessary
and disadvantage is that we cant use metal for long time as we want it work for our use

Answer 2

Advantages of corrosion:-

Surface 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.

Disadvantages of corrosion:-

It reduces the strength of the structure, making it likely to collapse. It reduces the effectiveness of the device. It increases the maintenance cost. It is dangerous.