why the Iron Pillar in Delhi has not rusted for years
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Answer:
it is resistant to corrosion due to the formation of a thin protective passive film with high phosphorus content.
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Explanation:
the Corrosion Resistance property of the Delhi Pillar is due to: (i) the purity of its iron; (ii) high phosphorus; (iii) low sulphur; (iv) absence of any other metal; (v) cinder coating formed on the surface; (vi) better forge welding; (vii) drier and uncontaminated atmospheric condition; and (viii) mass metal effect
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