Prevention of corrosion of metals :
- Covering the surface of metal with paint or by some chemicals like bisphenol which prevent the surface of metallic object to come in contact with atmosphere.
- Covering the surface of metal by other metals like tin or zinc that are inert or react themselves with atmosphere to save the metal.
- An electrochemical method in which a sacrificial electrode of another metal like magnesium and zinc etc., corrodes itself to save the metal.