What is Galvanic Corrosion?

When two metals having differing electrode potentials are in contact with each other in the presence of an electrolyte, one metal acts as a cathode whereas the other acts as an anode. This leads to an electrochemical reaction as a result of which, the anode is dissolved into the electrolyte. This electrochemical process is called galvanic corrosion of metals. Galvanic corrosion can only occur when there exists an electric conducting path connecting the metals and when an electrolyte which can offer a channel for the migration of ions is present.

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