A visible corrosion product consisting of hydrated oxides of iron. Applied only to ferrous alloys. See also white rust.

Coal tar or asphalt-based coating.

Threshold stress intensity for stress-corrosion cracking. The critical stress intensity at the onset of stress-corrosion cracking under specified conditions.

Separation of a solid accompanied by little or no macroscopic plastic deformation. Typically, brittle fracture occurs by rapid crack propagation with less expenditure of energy than for ductile fracture.

A decrease in the polarization of an electrode; the elimination or reduction of polarization by physical or chemical means; depolarization results in increased corrosion.

An accelerated corrosion test for some electrodeposits for anodic coatings on aluminum.

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

A general term used to imply that a part in service (1) has become completely inoperable, (2) is still operable but is incapable of satisfactorily performing its intended function, or (3) has deteriorated seriously, to the point that it has become unrelia ...

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

A condition in which a piece of metal, because of an impervious covering of oxide or other compound, has a potential much more positive than that at the metal in the active state.

See inhibitor

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

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

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

A compound that causes oxidation, thereby itself being reduced.

Corrosion that occurs under some coatings in the form of randomly distributed threadlike filaments.

A stress that causes an elastic body to deform (shorten) in the direction of the applied load. Contrast with tensile stress.

In electroplating, a supplementary anode positioned so as to raise the current density on a certain area of the cathode and thus obtain better distribution of plating.

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

See principal stress (normal).