To prevent rusting a , layer of `……….` metal is applied on irons sheets.

Explanation

The rusting of iron is an oxidation process. Due to corrosion of an iron a deposit of reddish substance `(Fe_(2)O_(3).H_(2)O)` is formed on it. This substance is called rust .To prevent corrosion , a layer of zinc metal (galvanisation) is applied on irons sheets.