Galvanizing

is the process of applying a protective zinc coating to steel or iron,to prevent rusting. The most common method is hot-dip galvanizing in which parts are submerged in a bath of molten zinc.

Galvanizing protects in two ways:

It forms a coating of corrosion-resistant zinc which prevents corrosive substances from reaching the more delicate part of the metal. The zinc serves as a sacrifical anacode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc. The zinc protects its base metal by corroding before iron, for better results application of chromates over zinc is also seen as an industrial trend. Hot-dip galvanizing deposits a thick robust layer of zinc iron alloys on the surface of a steel item. In the case of automobile bodies, where additional decorative coatings of paint will be applied, a thinner form of galvanizing is applied by electrogalvanizing.