Minerals and Metals in Ancient India v1.c27.s3.t1.5

v1.c27.s3.t1.5

However, Ghosh (1963: 39-40) was not convinced that the effect of the composition of an iron sample on its corrosion-resistance was absolutely negligible. While Koṇārka ancient beam has corroded more than the Delhi Iron Pillar, yet one has to reckon “that a few modern iron beams lying in the yards of the Koṇārka temple got corroded much more (than the ancient beams on the same spot) tho-ugh they have not been there for more than 50-70 years”. Better corrosion-resist-ance of Delhi Iron Pillar could be not only due to environment but also to the facts that it has more (0.25 %) corrosion-resistance phosphorus (Koṇārka beam assays only 0.015 %), and less porosity on account of heavier mechanical working.