Tag #Corrosion

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cnn.com

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May 16, 22:08

Delhi's 1600-Year-Old Iron Pillar: A Testament to Ancient Metallurgical Prowess

A 5th-century, 7.2-meter, six-ton iron pillar in Delhi's Qutb Minar complex defies corrosion due to its high phosphorus content, lack of sulfur and magnesium, and ancient forge-welding techniques, showcasing advanced ancient metallurgical practices.

Delhi's 1600-Year-Old Iron Pillar: A Testament to Ancient Metallurgical Prowess

A 5th-century, 7.2-meter, six-ton iron pillar in Delhi's Qutb Minar complex defies corrosion due to its high phosphorus content, lack of sulfur and magnesium, and ancient forge-welding techniques, showcasing advanced ancient metallurgical practices.

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Industry, Innovation, and Infrastructure

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What accounts for the Delhi Iron Pillar's exceptional resistance to corrosion despite 1600 years of exposure to the elements?

The 7.2-meter, six-ton iron pillar in Delhi's Qutb Minar complex, dating back to the 5th century, shows almost no corrosion despite centuries of exposure. Scientists attribute this to its high phosphorus content (around 1%), lack of sulfur and magnesium, and the ancient forge-welding technique used in its creation. A protective layer of misawite further enhances its durability.

taz.de

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Feb 20, 01:12

Paris 2024 Olympic Medals Rust, Exposing Low Gold Content and Quality Issues

The Paris 2024 Olympic gold medals, made with recycled materials and low gold content (around 1%), are rusting, forcing replacements, similar to issues at Rio 2016, raising questions about material choices and the IOC's quality control.

Paris 2024 Olympic Medals Rust, Exposing Low Gold Content and Quality Issues

The Paris 2024 Olympic gold medals, made with recycled materials and low gold content (around 1%), are rusting, forcing replacements, similar to issues at Rio 2016, raising questions about material choices and the IOC's quality control.

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Responsible Consumption and Production

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What role did the EU's chemical regulations and the use of recycled materials play in the deterioration of the Paris 2024 Olympic medals?

The degradation of Paris 2024 gold medals, echoing similar problems at Rio 2016, highlights the tension between cost-cutting and maintaining quality. The use of recycled materials, while environmentally commendable, apparently introduced problems exacerbated by the low actual gold content of the medals. This raises questions about the IOC's commitment to providing high-quality awards reflecting the athletes' achievements.",

nos.nl

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Apr 1, 22:12

13 Dutch Bridges to be Replaced Due to Hydrogen Embrittlement

Due to hydrogen embrittlement in their steel structures, thirteen Dutch bridges and viaducts built between 1957 and 1969 will be replaced ahead of schedule, following a similar bridge collapse in Germany. Rijkswaterstaat asserts that there is no immediate safety risk.

13 Dutch Bridges to be Replaced Due to Hydrogen Embrittlement

Due to hydrogen embrittlement in their steel structures, thirteen Dutch bridges and viaducts built between 1957 and 1969 will be replaced ahead of schedule, following a similar bridge collapse in Germany. Rijkswaterstaat asserts that there is no immediate safety risk.

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Industry, Innovation, and Infrastructure

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What immediate actions are being taken in response to the discovery of hydrogen embrittlement in Dutch bridges and viaducts?

Thirteen bridges and viaducts in the Netherlands will be replaced ahead of schedule due to the risk of micro-cracks in their steel structures, caused by hydrogen embrittlement during construction in the 1950s and 60s. This process weakens the steel, potentially leading to collapse, though Rijkswaterstaat assures there is no immediate safety risk.

welt.de

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Feb 12, 07:08

Southwest Germany Imposes Bridge Restrictions to Prevent Collapses

To prevent bridge collapses like the one in Dresden, southwest Germany is implementing speed limits, distance rules for heavy trucks, and other restrictions on 31 at-risk bridges, with plans to replace 73 by 2030 due to corrosion issues affecting prestressing steel.

Southwest Germany Imposes Bridge Restrictions to Prevent Collapses

To prevent bridge collapses like the one in Dresden, southwest Germany is implementing speed limits, distance rules for heavy trucks, and other restrictions on 31 at-risk bridges, with plans to replace 73 by 2030 due to corrosion issues affecting prestressing steel.

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Sustainable Cities and Communities

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What immediate safety measures are being taken to address the risk posed by endangered prestressed concrete bridges in southwest Germany?

Numerous prestressed concrete bridges in southwest Germany are considered endangered, leading to restrictions on heavy trucks to ensure safety. New distance rules and speed limits are being implemented to reduce stress on these structures, with signage currently being installed. No bridge closures are planned.

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