Removing surface oxides from metals by chemical or electrochemical reaction. Pickling is the removal of any high temperature scale and any adjacent low chromium layer of metal from the surface of stainless steel by chemical means. Where the steel has b ...

The technique for varying the potential of an electrode in a continuous manner at a preset rate.

(1) State of anodically passivated metal characterized by a considerable increase of the corrosion current, in the; absence of pitting, when the potential is increased. (2) The noble region of potential where an electrode exhibits at higher than passive c ...

Corrosion occurring preferentially at grain boundaries, usually with slight or negligible attack on the adjacent grains. Also called intercrystalline corrosion.

Perforation of material in outer space resulting from meteor strikes.

See hydrogenembriltlement.

Formation of isolated particles of corrosion products beneath a metal surface. This results from the prcferential reactions of certain alloy constituents to inward diffusion of oxygen, nitrogen, or sulfur.

Through or across crystals or grains. Also called intracrystalline or transcrystalline.

The current distribution in an electrolytic cell that is free of polarization.

The stress required to produce fracture in the plane of cross section, the conditions of loading being such that the directions of force and of resistance are parallel and opposite although their paths are offset a specified minimum amount. The maximum lo ...

The movement of ions through the electrolyte associated with the passage of the electric current. Also called transport or migration.

A tendency for some alloys to separate along grain boundaries when stressed ordeformed at temperatures near the melting point.Hot shortness is caused by a low-melting constituent, often present only in minute amounts,that is segregated at grain boundaries ...

Coating containing a zinc powder pigment in an inorganic vehicle.

(1) An arbitrarily defined temperature that lies within the temperature range in which metal fracture characteristics (as usually determined by tests of notched specimens) change rapidly, such as from primarily fibrous (shear) to primarily crystalline (cl ...

(1) Before finishing to final dimensions, repeatedly heating a ferrous or nonferrous part to or slightly above its normal operating, temperature and then cooling to room temperature to ensure dimensional stability in service. (2) Transforming retained aus ...

Molten slag; in the pulp and paper industry, the cooking chemicals tapped from the recovery boiler as molten material and dissolved in the smelt tank as green liquor.

The component of either a liquid or solid solution that is present to a greater or major extent; the component that dissolves the solute.

See galvanostatic.

An aggregate of iron or alloy carbides of essentially spherical shape dispersed throughout a matrix of ferrite.

A specimen that is notched and subjected to alternating stresses until a crack has developed at the root of the notch.