Question

What combination of metals is the iron pillar near Qutab Minar in Delhi made of?

Answer 1

Iron pillar in Delhi is made up of wrought iron(which is low carbon steel), it has also thin film of magnetic oxide of iron(Fe3O4) on the surface and the iron pillar is also painted with mixture of different salts.

Answer 2

Ninety eight percent pure wrought iron. it has avoided corrosion from the rains, winds and temperature fluctuations over the last 1600 years through the accidental formation of a "passive protective film."

This film is a 1/20th of a millimeter thick layer of "misawite,"on the pillar. Misawite is a compound of iron, oxygen and hydrogen which does not rust.

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