Foreign substance which comes from the environment, adhering to a surface of a material

(1) A reaction in which there is an increase in valence resulting from a loss of electrons. Contrast with reduction. (2) A corrosion reaction in which the corroded metal forms an oxide; usually applied to reaction with a gas containing elemental oxygen, s ...

The ratio of the electrochemical equivalent current density for a specific reaction to the total applied current density.

The destruction of adhesion between a coating and the surface coated.

A metastable lamellar aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures above the bainite range.

A pair of dissimilar conductors, commonly metals, in electrical contact. See also galvanic corrosion.

A substance that produces depolarization.

See chemical vapor deposition, physical vapor deposition and sputtering.

Removing the thick layer of oxides formed on some metals at elevated temperatures.

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 process involving conjoint corrosion and cavitation.

A positively charged ion that migrates through the electrolyte toward the cathode under the influence of a potential gradient. See also anion and ion.

(1) The amount of any substance dissolved or deposited in electrolysis is proportional to the total electric charge passed. (2) The amounts of different substances dissolved or deposited by the passage of the same electric charge are proportional to their ...

The range of the stress-intensity factor during a fatigue cycle.

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

Numerous, very fine cracks in a coating or at the surface of a metal part. Checks may appear during processing or during service and are most often associated with thermal treatment or thermal cycling. Also called check marks. checking, or heat checks.

In austenitic stainless steels the precipitation of chromium carbides, usually at grain boundaries, on exposure to temperatures of about 550 to 850

The number of cycles of stress that can be sustained prior to failure under a stated test condition.

The maximum current density that can be used to obtain a desired electrode reaction without undue interference such as from polarization.

Ability of a metal to withstand corrosion in a given corrosion system.