Question

Explain wet theory of corrosion by taking rusting of iron as an example

Answer 1

Answer:

Corrosion is the process of formation of a layer of oxide, sulphide, hydroxide, carbonate or hydrated oxide over a metal in presence or water and air or an acid.

E.g. when an iron article is placed openly in moist climate, it rusts.

4Fe+3O₂+nH₂O→2Fe₂O₃.nH₂O

This layer of hydrated oxide is reddish brown in colour and is called as rust