Abstract
This chapter discusses cathodic protection. Cathodic protection is a proven corrosion control method for protection of underground and undersea metallic structures, such as oil and gas pipelines, cables, utility lines, and structural foundations. The chapter illustrates the simple principle of cathodic protection. On application of an external current, the difference of potential between the cathodes and anodes on the structure decreases. It also discusses factors leading to corrosion of underground metallic structures. It has been shown that there must be a source of current to supply electrons to the areas of the metal that is corroding. Anodic protection is widely applied in the transport of acids and corrosives in containers and other applications. The two types of cathodic protection systems that are discussed are: galvanic anode system or sacrificial anode system and impressed current anode system. The details of galvanic and impressed current anodes are provided later in the chapter. It discusses the various components of galvanic systems, impressed current systems, AC/DC systems, and a rectifier. Some commercial specifications and details of zinc anodes are appended to this chapter.
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