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- W3105655992 abstract "As in life, so in redox reactions: some are good and some are bad. Corrosion is one of the evil among redox reactions. It is the unwanted oxidation of a metal that cuts short the lifetimes of steel products such as bridges and vehicles. Replacing corroded metal parts costs industry and society a huge amount each year. Understanding it helps us to find ways to prevent it. Not all corrosion, however, is unwanted: the green patina of copper roofs is often sought and can be beautiful; the induced oxidation of aluminium in the presence of dyes can also be intentional and can bring graceful colour to a building. I shall focus on the corrosion of iron, Fe (from the Latin ferrum), its rusting, as it is so common a way of death for our everyday artefacts. Iron rusts when it is exposed to damp air, with both oxygen and water present. In the process the Fe atoms of the metal are oxidized—lose some electrons—and become Fe3+ ions. These ions pick up some oxide ions, O2–, and are deposited as the red–brown oxide, Fe2O3. The corrosion of iron is very much like its reversion to the ore, which is also typically Fe2O3, from which, with so great an effort and all the expensive and energy-intensive, environmentally invasive fury of a blast furnace, it was originally obtained (Reaction 4). In the process of forming Fe3+, the oxygen of the air, the oxidizing agent, is converted to water. The hydrogen atoms needed for the formation of H2O molecules from O2 molecules are scavenged from the surrounding solution, especially if it is acidic and rich in hydrogen ions. I shall now show you the reaction in more detail and try to lead you into appreciating visually what is going on inside a small droplet of water on the surface of a sheet of rusting iron. Although rusting is rarely thought beautiful, there is a beauty and subtlety in the choreography of the atomic events that underlie its formation. As usual, you should imagine shrinking to the size of a molecule, plunging below the droplet’s surface, and descending diver-like through the densely agitating, bustling, tumbling water molecules." @default.
- W3105655992 created "2020-11-23" @default.
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- W3105655992 date "2011-09-15" @default.
- W3105655992 modified "2023-09-26" @default.
- W3105655992 title "The Death of Metal: Corrosion" @default.
- W3105655992 doi "https://doi.org/10.1093/oso/9780199695126.003.0012" @default.
- W3105655992 hasPublicationYear "2011" @default.
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