Corrosion

Definition of corrosion

Corrosion is the oxidation of metals by certain substances (mostly water and oxygen) in the environment. A metal corrodes when it gives up its electrons and loses strength and elasticity. Some common examples of corrosion include rusting of iron, surface oxidation of aluminium, tarnishing of silver and verdigris on copper. Corrosion can be classified into two categories:
• Dry corrosion where the metal is oxidised directly by atmospheric oxygen.
• Wet corrosion is when the presence of water and air accelerates the process of corrosion.

The condition which rusting of irons occurs

For iron and for any other metal, any region of electrochemical corrosion must have
a) an anode where oxidation occurs
b) a cathode where reduction occurs
c) a meta path for electron and
d) an el...