Methods of preventing corrosion:(i). Alloying:
Metals can be alloyed to prevent the corrosion process.
(ii). Surface coating:
Surface coating process
Surface coating involves the application of a protective layer over the metal. It is classified as follows.
Galvanization is a method of coating zinc on iron sheets by using an electric current.
Industrial galvanization process
Electroplating is a technique of coating one metal over another metal by passing an electric current.
Copper electroplating technique
Anodizing is an electrochemical method that turns the metal surface into decorative, durable and corrosion-resistant. Aluminium is widely used for the anodizing process.
Aluminium anodizing process
(d). Cathodic protection:
Cathodic protection is a process of controlling corrosion of a protected metal surface coated with easily corrodible metal. The easily corrodible metal is called sacrificial metal, which acts as an anode, ensuring cathodic protection.
Steel cathodic protection process