Ironarticlesusually rustwithinfew years.But since400 A.D theDelhiiron – InterviewSolution

1.	Ironarticlesusually rustwithinfew years.But since400 A.D theDelhiiron pillerNear Kutab Minaris existingwithout anyrustor signof decay. Explainhow ?
Answer» Solution :Iron rustsdue totheformation ofhydrated ferricoxide ` (Fe _ 2 O_3 .x H _ 2 O ) `which keepson peelingoff,exposingfresh surfaceto airand moisturefor rusting. ONTHE OTHERHAND,magnetite`(Fe_ 3O_ 4 ) `isanotheroxideof ironwhichstickstothe surfaceto metalofcenturies. THUS, Delhiiron pillar doesnot rustsincea thinfilmofmagnetite hasbeenappliedon itssurfacebyapplyingamixtureofdifferentsalts,heatingand quenching.

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