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Corrosion in metals is an example of a Galvanic Corrosion.
Corrosion can be defined as the degradation of metals due to an electrochemical process. Examples include; the formation of rust when oxygen reacts with iron, and tarnish on silver. Galvanic Corrosion is a type of corrosion that occurs when two or more different kinds of metal with physical or electrical contact are exposed to an electrolyte such as salt water, or it may also occur when the metal is exposed to a different concentration of electrolyte.