A source of electric current (DC) for protecting offshore plat forms and other steel structures resting on the sea floor against corrosion. The anode is anchored to the se t floor a few hundred feet away from the structure but is held off bottom by is buoyancy. The anode is connected to a source of DC current on the platform by an insulated cable. The weak current is supplied by a transformer-rectifier, the negative terminal of which is grounded to the steel structure. This the completion of the circuit from rectifier to anode to structure is through the sea water. The weak current moving from anode to the structure reverses the flow of current associated with the corrosion of metal. See also Rectifier Bed.
