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Wikipedia: A sacrificial anode, or sacrificial rod, is a metallic anode used in cathodic protection where it is intended to be dissolved to protect other metallic components. The more active metal is more easily oxidized than the protected metal and corrodes first (hence the term "sacrificial"); it generally must oxidize nearly completely before the less active metal will corrode, thus acting as a barrier against corrosion for the protected metal.
![[Partially corroded sacrificial anode on the hull of a ship.]](http://images.ookaboo.com/photo/s/Sacrificial_anode_s.jpg "Partially corroded sacrificial anode on the hull of a ship.")
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