The electrode of an electrolytic cell at which reduction is the principal reaction (Electrons flow toward the cathode in the external circuit ). Typical cathodic processes are cations taking up electron and being discharged, oxygen being reduced, and the reduction of an element or group of elements from a higher to a lower valence state.
A process by which the corrosion of a metal pipeline may be protected by the use of an electrical current.
An unusual condition (especially with Al, Zn, Pb) in which corrosion is accelerated at the cathode because the cathodic reaction creates an alkaline condition which is corrosive to certain metals.
Preventing corrosion of a pipeline by using special cathodes (and anodes) to circumvent corrosive damage by electric current. Also a function of zinc coatings on iron and steel drainage products – galvanic action.
General term which, in trenchless technology, refers to methods by which joints may be closed within a pipeline.