Question

If zinc coating is removed after galvanisation, the iron article does not corrode. Why.

Answer 1

The outer layer of zinc of any galvanized material reacts with the moisture, air, and carbon dioxide and forms an invisible, non-reactive layer of basic zinc carbonate Zn(OH)2. ZnCO3. Thus, even if the outer layer of zinc undergoes corrosion, the material is getting coated with a stronger layer of basic zinc carbonate, and thus is able to resist corrosion.