Galvanising is the application of zinc layer on surfaces to prevent them from getting rust. The zinc coating of hot-dipped galvanised steel lasts in the harshest soil for 35 to 50 years and in less corrosive soil for 75 years or more. Galvanised zinc coatings respond amazingly well in extreme hot & cold temperatures.
Zinc coatings form a protective barrier against moisture. It is necessary to apply this zinc layer on metals as iron and steel are particularly susceptible to oxidation. Prevention is always better than cure, therefore such parts of a vehicle should be galvanised well in advance.
Corrosion of zinc-coated metals is 100x slower as compared to non-coated metals.