Why the Iron Pillar at Delhi does not get rusted?
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Iron Pillar at Delhi does not get rusted because it is made up of wrought iron(low-carbon steel), it is prevented because of the formation of a thin film of magnetic oxide of iron(Fe3O4) on its surface and it is painted with mixture of various salts. That is the reason it is not rusted yet.
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Iron pillar of Qutub Minar is not rusted because it was made by 98% wrought iron. ... A thin layer of a˜misawitea (formed catalytically by the presence of phosphorous in the iron), a compound of iron, oxygen and hydrogen, has also protected the pillar.
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