A period prior to the detection of corrosion while the metal is in contact with a corrodent.

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

A thin, tightly adhering oxide skin (only a few molecules thick) that forms when steel is tempered at a low temperature, or for a short time, in air or a mildly oxidizing atmosphere. The color, which ranges from straw to blue depending on the thickness of ...

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

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

(1) The relationship between the current density at a point on a surface and its distance from the counter electrode. The greater the ratio of the surface resistivity shown by the electrode reaction to the volume resistivity of the electrolyte, the better ...

The rate of crack extension caused by constant-amplitude fatigue loading, expressed in terms of crack extension per cycle of load application.

A network of checks or cracks appearing on the surface.

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

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

The current flowing to or from a unit area of an electrode surface, generally expressed as amps per sq ft or milliamperes per sq ft (also milliamps per sq cm, etc).

A substance that produces depolarization.

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

See chemical vapor deposition, physical vapor deposition and sputtering.

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 cell developed in an electrolyte resulting from electrical contact between two dissimilar metals. See galvanic corrosion.

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.

(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 difference between the actual electrode potential when appreciable electrolysis begins and the reversible electrode potential.