The iron pillar of Delhi has rusted. What is the reason?
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The iron pillar in India was manufactured by the forge welding of pieces of wrought iron. In a report published in the journal Current Science, R. Balasubramaniam of the IIT Kanpur explains how the pillar's resistance to corrosion is due to a passive protective film at the iron-rust interface.
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Pillar's resistance to corrosion is due to a passive protection film at the iron rust surface. ... It is due to the formation of an even layer of crystalline iron hydrogen phosphate hydrate due to the high content of phosphorus in the iron.
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