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why iron pillar of India does not corrode, since it had build years ago?

It is known that serious corrosion of iron does not take place if critical value of relative humidity is less than 80%.It consists of approximately 80% of an oxide of iron having the properties of the solid solution phase of mixtures of FeO and Fe2O3. About 10% of this hydrated oxide of iron, approaching Limonite (Fe2O3.3H2O) .In brief, it can be concluded that the corrosion resistance property of the Iron Pillar is due to: (i) the purity of its iron; (ii) high phosphorus; (iii) low sulfur; (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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