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Methods of preventing corrosion: (i). Alloying:
Metals can be alloyed to prevent the corrosion process.
Example:
Stainless Steel
(ii). Surface coating:
Surface coating process
Surface coating involves the application of a protective layer over the metal. It is classified as follows.
(a). Galvanization:
Galvanization is a method of coating zinc on iron sheets by using an electric current.
Industrial galvanization process
(b). Electroplating:
Electroplating is a technique of coating one metal over another metal by passing an electric current.
Copper electroplating technique
(c). Anodizing:
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
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