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The approximately 24-foot- (7-meter-) tall, 6-ton iron pillar located in the famous Qutb Minar complex of Delhi, India, is one of the world’s foremost metallurgical curiosities. A testament to the advanced skill of ancient Indian ironsmiths, it is the last remaining part of a Hindu temple erected by 5th-century ruler Chandra Gupta II. Although it is about 1,600 years old, the pillar has never corroded. What theories have scientists advanced to explain the pillar’s resistance to corrosion? Discuss
Source: The Free Dictionary