. Why do we apply paint on iron articles
Chemically rust is an Iron oxide layer formed on iron articles. When rusting develops on iron articles they come poisoned and they look dull. The arrangement of rust requires iron, water, and oxygen. In order to help the rusting of iron we apply paint on iron articles so that the layers of iron can't come in contact with the environment and don't reacts with oxygen to form iron oxide and rust isn't developed. Another way to prevent it's to canvas the iron articles so that water or oxygen doesn't come in contact with air and water. Linseed oil helps to take off the rust from the iron articles. Any acrylic paint helps to prevent the rusting of iron. Corrosion of silver is due to the silver sulphide layer formed on its shell. The silver becomes blackish in colour due to its erosion. Corrosion of copper is formed due to the oxygen and carbonates then it forms a copper oxide which is red and black in colour and copper carbonate which is green in colour. Corrosion of steel and iron is due to oxygen due to which it forms an iron oxide on its face which is reddish-brown in colour.