Product Catalog

Graphite Anodes

View PDF  |  Add to Cart

impressed current graphite anodes

The selection of the right impressed current anode for a particular protection project is based on the environment which surrounds a buried or submerged structure. In relatively dry soils, graphite anodes have proven to be an ideal choice. 

Corrpro manufactures a complete line of graphite anodes which are produced according to strict quality control guidelines. The anodes are composed of high quality petroleum coke which is mixed with coal tar binders and extruded into various diameter rods. The rods are heated repeatedly at temperatures in excess of 2,600°C and then cooled. The end result of this manufacturing process is an anode with a high percentage of carbon which can deliver effective protection at a relatively low consumption rate. In buried soil electrolytes with coke backfill, this consumption rate varies between 0.4 and 2.0 lbs/amp-yr. 

Due to the fact that graphite anodes are inherently very porous, Corrpro treats its graphite anodes with a microcrystalline wax. This wax inhibits moisture naturally penetrating the anode and extending the life.

A quality connection is an integral part of any high performance graphite anode. In addition to offering a standard end connection, Corrpro also produces a low resistance center connection. Center wire connections were developed to compensate for end effect. In this phenomenon, increased consumption occurs at the longitudinal ends of an anode. Corrpro’s center connection compensates for this effect. The lead wire connections in graphite rod anodes are made with an alloyed lead ferrule soldered to a tinned stranded copper conductor. The lead wire ferrule assembly is inserted into a predrilled hole in the end of the anode and hydraulically compressed to expand in an outward direction against the wall of the drilled hole. The connection made will withstand a minimum pull-out strength of 300 lbs. with a wire connection resistance under 0.004 ohm.