دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: 1. a negatively charged ion. 2. the ion in an electrolysed solution that migrates to the anode. See ion. Compare cation.

an ion with a negative charge.

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 formed metal bar (zinc, aluminum, etc.) attached by electrical wire to a structure to be protected and buried in conductive soil near that structure.

a substance that slows the reaction at the anode.

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.

clamshell-type rings of anodes that clamp around a pipeline.

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: a means of preventing the destructive electrochemical process of corrosion of a metal object by using it as the cathode of a cell with a sacrificial anode. Current at least equal to that caused by the corrosive action is directed toward the object, offsetting its electrical potential.

impressed current that offsets the current produced in a corrosion cell and reduces corrosion.

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