1.

What are the methods preventing corrosion ?

Answer»

Solution :Methods of preventing corrosion :
Alloying :
(i) The metals can be alloyed to prevent the process of corrosion .
(ii) E.g: Stainless Steel
SurfaceCoating : It involvesapplication of a protectivecoating over the metla. It is of the following types :
(a) Galvanization : It is the process of coatingzinc on iron sheets by USING electric current .
(b) Electroplating : It is a method of coatingone metal over anothermetal by passingelectric current .
(c) Anodizing :
(i) It is an ELECTROCHEMICAL process .
(ii) It convertsthe metal surface into a DECORATIVE, durableand corrosion resistant .
(iii) Aluminium is widely used for anodizing process .
(d) Cathodic Protection :
(i) It is the methodof controllingcorrosion of a metal surfaceprotectedis coated with themetal which is easily corrodible .
(ii) The easily corrodiblemetal is called SACRIFICIAL metal to act as anodeensuring cathodicprotection .


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