Aging under conditions of time and temperature greater than those required to obtain maximum change in a certain property, so that the property is altered in the direction of the initial value.,/dd>

The severe loss of ductility of a metal resulting from corrosive attack, usually inter,granular and often not visually apparent.

An assembly, consisting of a vessel, electrodes, and an electrolyte, in which electrolysis can be carried out.

The test or specimen electrode in an electrochemical cell.

System consisting of one or more metals and all parts of the environment that influence corrosion.

A fracture, usually of' polycrystalline metal, in which most of the grains have failed by cleavage, resulting in bright reflecting facets. It is associated with low-energy brittle fracture.

Corrosion which is increased because of the abrasive action of a moving stream; the presence of suspended particles greatly accelerates abrasive action.See erosion-corrosion.

Electroplating tin on an object.

A type of weld cracking that usually occurs below 203

Particles of foreign material in a metallic matrix. The particles are usually compounds (such as oxides, sulfides, or silicates), but may be of any substance that is foreign to (and essentially insoluble in) the matrix.

See mixed potential.

A reference electrode composed of mercury, mercurous chloride (calomel), and a saturated aqueous chloride solution.

A compound that causes oxidation, thereby itself being reduced.

The electric current that flows between metals or conductive nonmetal in a galvanic couple.

See principal stress (normal).

Modification of a corrosion system so that corrosion damage is mitigated.

Chromium plated for engineering rather than decorative applicactions.

Deterioration of metals as a result of the metabolic activity of microorganisms.

A measure of the acidity or alkalinity of a solution; The negative logarithm of the hydrogen-ion activity; it denotes the degree of acidity or basicity of a solution. At 25

Forming an adherent phosphate coating on a metal by immersion in a suitable aqueous phosphate solution. Also called phosphatizing. See also conversion coating.