Metals enter aqueous solution and are oxidized.
Oxidation reaction (pH independent):
Reduction reaction in acid solution:
In an acidic solution, the water molecules are protonated and the hydronium ions (H3O+) are directly reduced into H2.
Reduction reaction in neutral or slightly alkaline solution:
In a neutral or slightly alkaline solution, the protons of water are reduced into molecular hydrogen giving rise to the production of hydroxide ions responsible of the precipitation of the slightly soluble ferrous hydroxide (Fe(OH)2).
This finally leads to the global reaction of the anaerobic corrosion of iron in water:
Read more about Anaerobic Corrosion: Transformation of Ferrous Hydroxide Into Magnetite, See Also
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... Bacterial anaerobic corrosion is a bacterially-induced oxidation of metals ... In a humid environment and anoxic conditions the corrosion of metals occurs as a result of a redox reaction that generates molecular hydrogen from hydrogen ions, requiring bacteria, unlike anaerobic corrosion ... As the metal is oxidized under anaerobic condition by the protons of water, H+ ions are reduced to form molecular H2 ...