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

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

A galvanic cell resulting from difference in oxygen concentration between two locations; See differential aeration cell.

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

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.

The eutectic of the iron-carbon system, the constituents of which are austenite and cementite. The austenite decomposes into ferrite and cementite on cooling below the temperature at which transformation of austenite to ferrite or ferrite plus cementite i ...

An instrument for indicating or measuring a small electric current by means of a mechanical motion derived from electromagnetic or electrodynamic forces produced by the current.

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

Performing a chromate treatment

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

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

See inhibitor

(1) A chemical substance or mixture, usually liquid, containing ions that migrate in an electric field. (2) A chemical compound or mixture of compounds which when molten or in solution will conduct an electric current.3.A nonmetallic (liquid or solid) con ...

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

Electrodepositing a metal or alloy in an adherent form on an object serving as a cathode.

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

That portion of the base metal that was not melted during brazing, cutting, or welding, but whose microstructure and mechanical properties were altered by the heat; Refers to area adjacent to a weld where the thermal cycle has coused microstructural chang ...

Coal tar or asphalt-based coating.

(1) Producing a chromate conversion coating on magnesium for temporary protection or for a paint base. (2) The solution that produces the conversion coating.