The maximum compressive stress a material is capable of developing. With a brittle material that fails in compression by fracturing, the compressive strength has a definite value. In the case of ductile, malleable, or semiviscous materials (which do not f ...

A visible corrosion product consisting of hydrated oxides of iron. Applied only to ferrous alloys. See also white rust.

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

The algebraic ratio of two specified stress values in a stress cycle. Two commonly used stress ratios are: (1) the ratio of the alternating stress amplitude to the mean stress. A = Sa/Sm and (2) the ratio of the minimum stress to the maximum stress. R =Sm ...

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.

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 compound with a central atom or ion bound to a group of ions or molecules surrounding it. Also called coordination complex. See also chelate, complexation, and ligand.

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

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

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

A network of checks or cracks appearing on the surface.

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

A substance that produces depolarization.

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

See chemical vapor deposition, physical vapor deposition and sputtering.

The net transfer of electric charge per unit time. Also called electric current. See also current density.

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

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

Splitting (fracture) of a crystal on a crystallographic plane of' low index.