Question

What is the corrosion why do aluminium sheets not corrode easily why is a copper vessel covered with a green coating in rainy season

Answer 1

1. Answer: Aluminum unlike iron and steel,does not rust or corrode in moist conditions. Its surface is protected by a natural layer of aluminium oxide. This prevents the metal below from coming into contact with air and oxygen.


2. Copper metal when exposed to air turns green in colour due to corrosion. When copper vessel is exposed to air in rainy season, the metal reacts with gases and moisture and atmospheric gases to form a mixture of coppercarbonate and copper hydroxide. This gives a green colour to the surface ofcopper metal.