Question

For prevention of rusting of iron ,which paint is used? with chemical formula.

Answer 1

Iron rusts because it can be contacted by water-or the moisture in the air- and the metal takes the oxygen from the water forming iron oxide-rust. Paint or plating(like chrome plating) prevents the H2O molecules from reaching the surface of the metal so it can’t get the oxygen. As a consequence, the iron can’t rust since it can’t get to the water molecules when it is painted.
Zinc can also be applied by brushing or spraying. If oxidation or rust is occurring, the zinc will oxidize before the ferrous metal it is coating. This prevents corrosion and weakening of the ferrous metal. Zinc is often applied below a finish paint coat.