How is metal corrosion prevented?

Explanation

Methods of preventing corrosion :
1 Alloying : The metals can be alloyed to prevent the process of corrosion. E.g : Stainless Steel
2. Surface Coating : It involves application of a protective coating over the metal. It is of the following types:
(a) Galvanization : It is the process of coating zinc on iron sheets by using electric current.
(b) Electroplating : It is a method of coating one metal over another metal by passing electric current .
(c) Anodizing : It is an electrochemical process that converts the metal surface into a decorative, durable and corrosion resistant. Aluminium is weidely used for anodizing process .
(d) Cathodic Protection : It is the method of controlling corrosion of a metal surface protected is coated with the metal which is easily corrodible. The easily corrodible metal is called Sacrificial metal to act as anode ensuring cathodic protection.