Sacrificial anode

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Sacrificial anode

Meaning of term sacrificial anode

A metal rod placed in a water heater tank to protect the tank from corrosion. Anodes of aluminum, magnesium, or zinc are the more frequently metals. The anode creates a galvanic cell in which magnesium or zinc will be corroded more quickly than the metal

Source: http://www.desc.dla.mil/dcm/files/all%20inclusive%20energy%20glossary.xls

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