Question

why does iron pillar near Qutub minar in Dehi dosent get rusted in last peroid of 1600 years

Answer 1

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