Galvanization

Galvanization is the process of applying a protective layer of zinc on a metal. It is a very common method of preventing the rusting of iron. This can be done by dipping the metal to be protected in hot, molten zinc or by the process of electroplating.

The protection of iron and steel from corrosion by coating with molten zinc. has been proved for a hundred and fifty years.
The zinc coating protects from the atmosphere the part’s surface, avoiding corrosion and weathering.

Galvanization helps extend the life of steel parts by forming a membrane between the metal and the air, preventing the accumulation of iron oxide on the steel layer. Galvanization also offers superior corrosion resistance to environmentally exposed parts.
Disadvantages

The disadvantages of galvanization are listed below

It only provides protection from corrosion for a limited amount of time since the zinc layer is eaten up in the process.It is not very effective in highly corrosive areas (where cadmium coating can be used instead).