Corrosion as Unwanted Spontaneous Oxidation
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State
Corrosion is the unwanted spontaneous oxidation of a metal by its environment, the same galvanic mechanism already built, operating without any intentional circuit design.
Show
Iron exposed to moist air oxidizes spontaneously to rust, an electrochemical process rather than a direct reaction with oxygen alone.
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Students often assume dry iron rusts as readily as wet iron, missing water's electrochemical role.