iron rusts ,where as stainless steel does not even though it contains large quantity of iron.why?
 

Asked by arajeevshashank | 7th Nov, 2017, 08:48: PM

Expert Answer:

Rusting of iron

When exposed to moist air, iron rusts, i.e. it forms a new compound, hydrated iron [III] oxide [Fe2O3.xH2O].

Stainless steel contains chromium. This chromium undergo oxidation and thin layer of chromium oxide forms on the surface which prevents the further oxidation. This is called as passivation, which prevents the number of metals and alloys from rusting.

Answered by Varsha | 13th Dec, 2017, 07:50: PM