Galvanization is the process of coating iron with a layer of zinc to prevent rusting.
Galvanising is a rust-prevention technique. This process keeps oxygen and water out of the metal underneath, but the zinc also serves as a sacrificial metal. Since zinc has a lower reduction potential than iron, it is more easily oxidized. Zinc is a more active metal since it has a lower reduction potential. As a result, even if the zinc coating is scratched, the zinc will oxidize first, followed by the iron.