A coating process, similar to gas carburizing and carbonitriding, whereby a reactant atmosphere gas is fed into a processing chamber where it decomposes at the surface of the workpiece, liberating one material for either absorption by, or accumulation on ...

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.

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.

A list of metals and alloys arranged according to their relative corrosion potentials in a given environment. Compare with electromotive series.

Pertaining to the current resulting from the coupling of dissimilar electrodes in an electrolyte

An obsolete historical term usually applied to stress-corrosion crackling of brass.

See auxiliary electrode.

(1) A metal whose potential is highly positive relative to the hydrogen electrode. (2) A metal with marked resistance to chemical reaction, particularly to oxidation and to evolution by inorganic acids. The term as often used is synonymous with precious m ...

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

Tendency of an environment to cause corrosion in a given corrosion system.

The maximum repeated stress that can he endured by a metal without failure under definite conditions of corrosion and fatigue and for a specific number of stress cycles and a specified period of time.

Surface discoloration of a metal caused by formation of a thin film of corrosion product.

An electrode immersed in a suitable electrolyte, designed for measurements of electrode potential; A pure metal in contact with a solution of known concentration of its own ion, at a specific temperature develops a potential which is characteristic and re ...

Interfacial reaction equivalent to a transfer of charge between electronic and ionic conductors. See also anodic reaction and cathodic reaction.

A graph or chart that shows constant corrosion behavior with changing solution (environment) composition and temperature.

In a thermodynamic system of several constituents, the rate of change of the Gibbs function of the system with respect to the change in the number of moles of a particular constituent.

The potential of an electrode in an electrolyte as measured against a reference electrode. The electrode potential does not include any resistance losses in potential in either the solution or external circuit. It represents the reversible work to move a ...

Localized corrosion frequently observed in oilwell tubing in which a circumfrential attack is observed near a region of metal "upset".

Being or composed of hydrocarbons or their derivatives, or matter of plant or animal origin. Contrast with inorganic.

A potential more cathodic (positive) than the standard hydrogen potential.