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corrosion - "the destructive attack of a metal by chemical or electrochemical reaction with its environment." - H.H. Uhlig
The electrochemical corrosion of steel under a drop of water. At the anode, the iron dissolution releases electrons, which travel through the metal to
the cathode, where the electrons combine with oxygen and water to form hydroxyls (OH-). The presence of salt stabilizes the acidic anode and the caustic cathode by the migration of Na+ to the cathode and Cl- ions to the anode. The Fe++ cations combine with water to form H+ cations and also precipitate the red rust. (from T.D. Burleigh's class notes, "Corrosion Phenomena.")
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