why doesn't the iron pillar near qutab minar rust ?

Dear student!

Actually, the iron pillar is made up of 98% wrought iron of pure quality, it is 23 feet 8 inches (7.21 m) high and has a diameter of 16 inches (0.41 m). Also, it was confirmed that the temperatures required to form such kind of pillars cannot be achieved by combustion of coal. The pillar is a testament to the high level of skill achieved by ancient Indian iron smiths in the extraction and processing of iron.

The corrosion resistant nature of pillar is due to a passive protective film at the iron-rust interface because of the high phosphorus content, which promotes the formation of a solid protective passivation layer of iron oxides and phosphates together with favorable local weather conditions, rather than the non-protective, cracked rust layer which are normally found in iron products.

I hope it clears!

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IRON PILLAR NEAR QUTB MINAR DOESN'T RUST BECAUSE AS PER RESEARCH IT SAYS THAT ONCE IT WAS STRUCK BY LIGHTNING AND UNKNOWN MATERIAL IS THERE WHICH STOPS IT FROM RUSTING IT IS SO THIN THAT IT CANNOT BE SEEN.

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