SSC Steno Grade C and D 12 Sep 2017 Shift 1 Paper

(3) In general, iron can be preventedfrom rusting by the applicationof grease and paintover it. However, in case of ironfrying pan, grease and paint arenot suitable because the panis normally heated at high temperaturerequired for cooking.Besides, the pan is washedagain and again due to whichthe coating of grease and paintgets destroyed.
Iron-frying pan can be protectedfrom rusting by a coating ofzinc, a process known as galvanizingof iron.Zinc, beingmore active than iron, developsa thin hard impervious layerof zinc oxide that protectsthe inner layer of zinc and theiron object itself.