It is a difficult process to separate metals from oxides and this process is performed with large quantities of raw material, energy and manpower. Therefore, the most widely used one of the methods used for preventing corrosion is protection against corrosion with paint as it shows high performance, it is aesthetical and easy-to-access.
Paints control corrosion as follows:
1 - They prevent water and oxygen from reaching the metal surface.
2 - Corrosion preventive pigments within them slow and stop corrosion. These pigments
3 - They retard corrosion with galvanic effect. Metal dusts heavier than iron (zinc, lead, aluminum) can be used as pigment. They electrically contact with metal and slow corrosion as they have cathodic characteristics compared to iron.
When selecting paint, the following criteria are expected in terms of corrosion preventive and other characteristics: