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

This potential, sometimes called zeta potential, is a potential difference in the solution caused by residual, unbalanced charge distribution in the adjoining solution, producing a double layer. The electrokinetic potential is different from the electrode ...

Corrosion that occurs under some coatings in the form of randomly distributed threadlike filaments.

Pertaining to forces on a body or part of a body that tend to crush or compress the body.

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

Plating wherein fine metal powders are peened onto the work by tumbling or other means.

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

One of the group of l5 chemically similar metals with atomic numbers 57 through 7l, commonly referred to as the lanthanides.

The molecule, ion, or group bound to the central atom in a chelate or a coordination compound.

A thin, not necessarily visible, layer of material.

The positive direction of electrode potential, thus resembling noble metals such as gold and platinum.

(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 ...

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

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>

Introducing nitrogen into the surface layer of a solid ferrous alloy by holding at a suitable temperature (below Ac1 for ferritic steels) in contact with a nitrogenous material, usually ammonia or molten cyanide of appropriate composition. Quenching is no ...

The test or specimen electrode in an electrochemical cell.

Heating a ferrous alloy to a suitable temperature above the transformation range and then cooling in air to a temperature substantially below the transformation range.

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.

See cathodic protection.

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