Question

Define the following terms:
electroplating, rusting, galvanisation

Answer 1

Electroplating is the process of covering a thin layer of one metal over another with the help of electricity. Electroplating is one of the methods used to protect a metal from corrosion. It gives the electroplated metal a shine and a nice look. ​For example, iron can be covered with a thin layer of chromium or tin with the help of electroplating.

Corrosion of iron is called rusting. Rusting is a process in which iron metal reacts with moist air (water + oxygen) present in the atmosphere to form iron oxide, ${\mathrm{Fe}}_2{\mathrm{O}}_3$, which is reddish brown in colour. Rusting of iron leads to very heavy damage to the substance. Thus, it should be prevented. Applying oil, grease or paint to iron objects can prevent rusting to some extent. Electroplating or galvanizing iron objects prevents them from rusting.

Galvanisation is the process of coating a thin layer of zinc on iron to prevent it from rusting. Objects made of iron are dipped in molten zinc to cover them with a thin layer of zinc. Iron sheets, dustbins, etc. are galvanised to prevent corrosion.