![]() ![]() This phenomenon is named after Italian physician Luigi Galvani (1737-1798).ĭissimilar metals and alloys have different electrode potentials, and when two or more come into contact in an electrolyte, one metal (that's more reactive) acts as anode and the other (that's less reactive) as cathode. A similar galvanic reaction is exploited in primary cells to generate a useful electrical voltage to power portable devices. Galvanic corrosion (also called bimetallic corrosion or dissimilar metal corrosion) is an electrochemical process in which one metal corrodes preferentially when it is in electrical contact with another, in the presence of an electrolyte. Corrosion of an iron nail wrapped in bright copper wire, showing cathodic protection of copper a ferroxyl indicator solution shows colored chemical indications of two types of ions diffusing through a moist agar medium ![]()
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