Iron pillar of Delhi – Wikipedia the free encyclopedia

The Iron Pillar located in Delhi, India, is a 7 m (23 ft) column in the Qutub complex, notable for the rust-resistant composition of the metals used in its construction. | The pillar has attracted the attention of archaeologists and metallurgists and has been called “a testament to the skill of ancient Indian blacksmiths” because of its high resistance to corrosion.[1] The corrosion resistance results from an even layer of crystalline iron hydrogen phosphate forming on the high phosphorus content iron, …

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