دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. one of two electrodes in an electrolytic cell;represented as the negative terminal of the cell, it is the area from which electrons flow. In a primary cell, it is the electrode that is wasted or eaten away. 2. in cathodic protection systems, an electrode to which a positive potential of electricity is applied, or a sacrificial anode, which protects a structure by forming one electrode of an electric cell.

the positively charged site in a cell. Oxidation site. The site of metal loss in corrosion.

the ratio of the mass loss of actual corrosion of an anode to the theoretical corrosion mass loss calculated from the quantity of electricity that has passed between the anode and the cathode using Faraday’s law (from NACE).

a type of corrosion found when dissimilar metals are joined. One part becomes the cathode and the other the anode where accelerated corrosion may be seen.

n: 1. one of two electrodes in an electrolytic cell, represented as the positive terminal of a cell. 2. in cathodic protection systems, the protected structure that is representative of the cathode and is protected by having a conventional current flow from an anode to the structure through the electrolyte.

the negative site of a corrosion cell. Reduction reactions are typical.

n: crushed coke used for packing underground anodes in cathodic protection systems to obtain increased anode efficiency at a reduced cost See coke.

n: 1. an electronic device that resbicts current flow chiefly in one direction. 2. a radio tube that contains an anode and a cathode.

n: in cathodic protection, a sacrificial anode that produces current flow through galvanic action. See sacrificial anode.

sacrificial anode.

n: (OSHA) the first business with employees within the customs territory of the United States that receives hazardous chemicals produced in other countries for the purpose of supplying them to distributors or employers within the United States. impressed-current anode n: anode to which an external source of IK>sitive electricity is applied (such as from a rectifier or DC generator). The negative electricity is applied to a pipeline. casing. or other structure to be protected by the impressedcurrent method of cathodic protection.

n: in cathodic protection. anodes made from metals whose galvanic potentials render them anodic to steel in an electrolyte. They are used up. or sacrificed.

a metal slug, lower in the electromotive series than steel that is hard wired to the casing and buried in a bed of wet soil or below the surface of the water. The corrosion cell in the well then transfers the current to the new anode and the steel in the