Heavy rust on the links of a chain near the Golden Gate Bridge in San Francisco; it was continuously exposed to moisture and salt spray, causing surface breakdown, cracking, and flaking of the metal. The chain was replaced in 2023. (Source)
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Rust scale forming and flaking off from a steel bar heated to its forging temperature of 1200C. Rapid oxidation occurs when heated steel is exposed to air (Source)
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Cor-Ten is a group of steel alloys which were developed to eliminate the need for painting, and form a stable rust-like appearance after several years' exposure to weather. (Source)