Iron pillar near qutab minar in …
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Meghna Thapar 5 years, 6 months ago
It is famous for the rust-resistant composition of the metals used in its construction. The pillar weighs over 3,000 kg (7,000 lb) and is thought to have been erected elsewhere, perhaps outside the Udayagiri Caves, and moved to its present location early in the Delhi Sultanate. The pillar 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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