An atmosphere in an area of heavy industry with soot, fly ash, and sulfur compounds as the principal constituents.

An anode that is insoluble in the electrolyte under the conditions prevailing in the electrolysis.

A chemical substance or combination of substances that, when present in the environment, prevents or reduces corrosion without significant reaction with the components of the environment.

Being or composed of matter other than hydrocarbons and their derivatives, or matter that is not of plant or animal origin. Contrast with organic.

Coating containing a zinc powder pigment in an inorganic vehicle.

See galvanostatic.

See intergranular corrosion.

See intergranular cracking.

Corrosive attack that progresses preferentially along interdendritic paths. This type of attack results from local differences in composition, such as coring commonly encountered in alloy castings.

Between crystals or grains. Also called intercrystalline. Contrast with transgranular.

Corrosion occurring preferentially at grain boundaries, usually with slight or negligible attack on the adjacent grains. Also called intercrystalline corrosion.

Cracking or fracturing that occurs between the grains or crystals in a polycrystalline aggregate. Also called intercrystalline cracking. Contrast with transgranular cracking.

Brittle fracture of a metal in which the fracture is between the grains, or crystals, that form the metal. Also called intercrystalline fracture. Contrast with transgranular fracture.

Stress-corrosion cracking in which the cracking occurs along grain boundaries.

Same as bipolar electrode.

The formation of isolated particles of corrosion products beneath the metal surface. This occurs as the result of preferential oxidation of certain alloy constituents by inward diffusion of oxygen, nitrogen, sulfur, and so forth.

The swelling or bubbling of a coating usually because of heating (term currently used in space and fire protection applications).

An atom, or group of atoms, that has gained or lost one or more outer electrons and thus carries an electric charge. Positive ions, or cations, are deficient in outer electrons. Negative ions, or anions, have an excess of outer electrons.

Deterioration of material caused by ion impact.

The reversible interchange of ions between a liquid and solid, with no substantial structural changes in the solid.