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What is Rust? |
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Rust is a generic term to describe a series of different oxides, Fe(OH)2, Fe(OH)3, FeO(OH), Fe2O3.H2O that form when iron corrodes. The common form of Rust is a Red products:Fe2O3. Rust forms due to a reaction between the iron and water; either water condensing from air or rain. The oxygen in the air dissolves in the water and causes rust to form. There are always two distinct chemical reactions in a corrosion process, the basic chemistry of corrosion is: 1) Anodic Dissolution of Metal (Iron) that goes into solution (water) Fe -----> Fe2+ + 2e- 2) Cathodic Reduction of Oxygen dissolved in water
O2 + 2H2O + 4e- ---->
4OH- The final reaction is: Fe2+ + 2OH- -----> Fe(OH)2 This oxide will then further reacts with oxygen to give the final red product: Fe2O3.H2O
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