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Under normal circumstances the first reaction contributes little to corrosion. Instead, the electroplating reduction reaction is typically applied in controlled situations where electroplating is a desired effect.
The 3 reactions consuming H+ ions are also rare, unless the metal is exposed to acid containing a significant concentration of H+ (e.g. hydrochloric acid).
Perhaps the most common reduction reaction found in practice is the creation of hydroxyl ions, since the required ingredients are oxygen and water (which is why oxygen and water have such bad reputations with respect to corrosion). The created hydroxyl ions typically combine with the metal ions released from the anode to produce surface deposits.
For example, OH- ions combine with corroded iron ions to produce Fe(OH)3, which is ordinary red iron rust.
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