A type of wear that occurs between tight-fitting surfaces subjected to cyclic relative motion of extremely small amplitude. Usually, fretting is accompanied by corrosion, especially of the very fine wear debris.

Overvoltage associated with the liberation of hydrogen gas.

(1) The application of an electrically conductive metallic layer to the surface of nonconductors. (2) The application of metallic coatings by nonelectrolytic procedures such us spraying of molten metal and deposition from the vapor phase.

The occurrence of embrittlement in a material below the melting point of the embrittling species. See also liquid-metal embrittlement.

Destruction of metals or other materials by the abrasive action of moving fluids, usually accelerated by the presence of solid particles or matter in suspension. When corrosion occurs simultaneously, the term erosion-corrosion is often used.

Descriptive treatment of fracture, especially in metals, with specific reference to photographs of the fracture surface. Macrofractography involves photographs at low magnification (< 25x); microfractography, photographs at high magnification (>25x)

Waste waters containing fetid materials, usually sulfur compounds.

Localized corrosion of a metal surface, confined to a point or small area, that takes the form of cavities or pits.

Thermal spraying in which coating material is fed into an oxyfuel gas flame, where it is melted. Compressed gas may or may not be used to atomize the coating material and propel it onto the substrate.

An obsolete term describing oil or grease coatings used to provide temporary protection against atmospheric corrosion.

The threshold value of the corrosion potential that has to be reached to enter a protective potential range. The term used in cathodic protection to refer to the minimum potential required to supress corrosion.

The opposition that a device or material offers to the flow of direct current, equal to the voltage drop across the element divided by the current through the element. Also called electrical resistance.

Lacking an affinity for, repelling, orfailing to absorb or adsorb water. Contrast with hydrophilic.

A twisting deformation of a solid body about an axis in which lines that were initially parallel to the axis become helices.

Also called postweld heat treatment cracking, stress-relief cracking occurs when susceptible alloys are suhjected to thermal stress relief after welding to reduce residual stresses and improve toughness. Stress-relief cracking occurs only in metals that c ...

A general term for the emhrittlement, cracking, blistering. and hydride formation that can occur when hydrogen is present in some metals.

The unit of change in the size or shape of a body due to force. Also known as nominal strain.

Artificial aging in which a constituent precipitated from a supersaturated solid solution.

Same as intergranular corrosion. See also interdendritic corrosion.

The stress condition in linear elastic fracture mechanics in which the stress in the thickness direction is zero; most nearly achieved in loading very thin sheet along a direction parallel to the surface of the sheet. Under plane-stress conditions, the pl ...