Direct current supplied by a device employing a power source external to the electrode system of a cathodic protection installation.

Surface having a thin, tightly adhering, oxidized skin (from straw to blue in color), extending in from the edge of a coil or sheet.

An aqueous solution containing one gram equivalent of the active reagent in 1L of the solution.

A compound that causes oxidation, thereby itself being reduced.

Aging induced by rapid cooling after solution heat treatment.

A thin, not necessarily visible, layer of material.

Corrosion in which cobalt is selectively leached from cobalt-base alloys, such as Stellite

The development of loose removable powder at the surface of an organic coating usually caused by weathering.

The ability of a solution to give satisfactory plating at very low current densities. a condition that exists in recesses and pits. This term suggests an ability to cover, but not necessarily to build up, a uniform coating, whereas throwing power suggests ...

The algebraic ratio of two specified stress values in a stress cycle. Two commonly used stress ratios are: (1) the ratio of the alternating stress amplitude to the mean stress. A = Sa/Sm and (2) the ratio of the minimum stress to the maximum stress. R =Sm ...

See exfoliation corrosion.

(1) An organic compound in which atoms form more than one coordinate bond with metals in solution. (2) A substance used in metal finishing to control or eliminate certain metallic ions present in undesirable quantities.

A chemical process involving formation of a heterocyclic ring compound that contains at least one metal cation or hydrogen ion in the ring.

Progressive loss of original material from a solid surface due to continuing exposure to cavitation.

The process of prior removal of the active corrosive constituents usually oxygen, from a corrosive liquid by controlled corrosion of expendable metal or by other chemical means, thereby making the liquid less corrosive.

A form of deterioration that is distributed more or less uniformly over a surface; See uniform corrosion.

A process of removing soil, scale, or corrosion products from a metal surface by subjecting it as an electrode to an electric current in an electrolytic bath.

The molecule, ion, or group bound to the central atom in a chelate or a coordination compound.

The potential of an electrode measured with respect to a reference electrode or another electrode when no current flows to or from it.

A state of resistance to corrosion or anodic dissolution of a metal caused by thermodynamic stability of the metal.