The Permanent Anode in Impressed‐current Cathodic Protection Systems—Part 1

Abstract

The radical mitigation of corrosion on external or internal surfaces of pipelines, tank farms, storage tanks, pylon footings and of gasholders, ship's ballast tanks, ship's hulls, condenser end‐boxes, heat exchangers and pasteurisers, has been successfully accomplished by the application of cathodic protection both by galvanic anodes and by the use of the impressed‐current method. The scope of cathodic protection is thus comprehensive. This paper describes in a general way the properties, uses and limitations of the principal materials used as anodes in impressed‐current cathodic protection systems, together with some indication of the effects of different environments upon the various materials. In this first part, graphite, silicone iron and scrap steel are discussed.