The several theories which have been proposed to explain its superior corrosion resistance can be broadly classified into two categories: The environmental and the material theories.
Proponents of the environmental theories state that the mild climate of Delhi is responsible for the corrosion resistance of the Delhi iron pillar. It is known that the relative humidity at Delhi does not exceed 70% for significant periods of time in the year, which therefore results in very mild corrosion of the pillar.
Its inability to rust is what have caught everyone’s attention!
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