Pitting corrosion resulting from deposits on a metal surface which cause concentration cells.

The frequency-dependent complex-valued proportionality factor (A

Corrosion effect on a metal per unit of time. The type of corrosion rate used depends on the technical .system and on the type of corrosion effect. Thus, corrosion rate may be expressed as an increase in corrosion depth per unit of time (penetration rate, ...

Electrode reaction equivalent to a transfer of negative charge from the electronic to the ionic conductor. A cathodic reaction is a reduction process. An example common in corrosion is: Ox + ne s Red.

Conduction of electric current from an underground metallic structure by means of a metallic conductor. Forced drainage is that applied to underground metallic structures by means of an applied electromotive force or sacrificial anode. Natural drainage is ...

Cracking that occurs in the weld metal. See also cold cracking, hot cracking, lamellar tearing, and stress-relief cracking.

A term primarily used in Europe to describe galvanic corrosion between dissimilar metals.

The portion of solution in immediate contact with the cathode during electrolysis.

The electroplating of zinc upon iron or steels

The ratio of the electric current density to the electric field in a material. Also called electrical conductivity or specific conductance.

A pattern of parallel surface cracks that are formed by alternate rapid heating and cooling of the extreme surface metal, sometimes found on forging dies and piercing punches. There may be two sets of parallel cracks one set perpendicular to the other.

The electrolyte adjacent to the cathode of an electrolytic cell.

The degradation of a solid body resulting from its exposure to cavitation. This may include loss of material, surface deformation, or changes in properties or appearance.

(1) A cell, the emf of which is due to the potential difference between a metal in an active state and the same metal in a passive state. (2) A corrosion cell in which the anode is a metal in the active state and the cathode is the same metal in the passi ...

Localized corrosion of a metal surface at, or immediately adjacent to, an area that is shielded from full exposure to the environment because of close proximity between the metal and the surface of another material.

A black finish on a metal produced by immersing it in hot oxidizing salts or salt solutions.

A type of inhibitor that appreciably changes the potential of u metal to a more noble (positive) value.

The stress that will cause fracture in a creep test at a given time in a specified constant environment. Also called stress-rupture strength.

The development of slight breaks in a coating that do not penetrate to the underlying surface.

A process involving conjoint corrosion and cavitation.