Sacrificial or galvanic anodes may be used to mitigate stray current effects in situations where small current flows or small voltage gradients exist. In effect, a potential gradient field produced by the galvanic anode(s) counteracts the interference current. The effect is a net current flow to the interfered with structure.
Another consideration when using a galvanic anode system to overcome stray currents is the expected life of the anodes. As the anodes dissipate, their resistance to ground increases. The increased resistance reduces the current flow from the anode and decreases the resulting voltage gradients. Sacrificial anodes should be sized to provide a sufficient anticipated life span. As with any other stray current mitigation procedure, the anodes should be placed on an active monitoring schedule.