Why Qutab Minar in Delhi not rusted yet although it is regularly exposed to air and water?
Answers
Answer:
Iron lumps(Produced by smelting iron ore in a smelter, forge, campfire, or oven) of about 30kg in weight were hammered together in hot state by a process known as forge welding.
The iron of the Pillar was extracted by the traditional Direct reduction method( The iron produced from the direct reduction processes can be utilized for several large-scale applications. One important application is the production of corrosion-resistant iron) and has been deliberately kept high in phosphorous(0.25% by weight) and low in carbon, sulphur and Manganese. The average composition of the Iron Pillar, based on 4 available analyses is (in weight %) 0.25 Phosphorous, 0.15 Carbon, 0.02 Nitrogen, 0.05 Sulphur and balance Iron.
The Pillar is resistant to corrosion due to the formation of a thin protective passive film, aided by the relatively high phosphorous content
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