An anode used to protect buried or submerged metal structures from corrosion, made from a metal alloy with a more "active" voltage (more negative electrochemical potential) than the metal of the protected structure, so that the anode material corrodes and is consumed in preference to the structure.

plural of galvanic action

plural of galvanic cell

(chemistry) A device that produces an electric current through simultaneous oxidation and reduction reactions occurring at two connected half cells.