The stress level in a material at or above the yield strength but below the ultimate strength, i.e., a stress in the plastic range.

Improving paint adhesion on aluminum or aluminum alloys, mainly aircraft skins, by treatment with a solution of' chromic acid. Also called chromodizing or chromatizing. Not to be confused with chromating or chromizing.

A coating consisting of' a compound of the surface metal, produced by chemical or electrochemical treatments of the metal. Examples include chromate coatings on zinc, cadmium, magnesium, and aluminum and oxide and phosphate coatings on steel. See also chr ...

An accelerated corrosion test for electrodeposits.

A thin, inhibiting paint, usually chromate pigmented with a polyvinyl butyrate binder.

The absorption of carbon into a metal surface; may or may not be desirable.

Occurs in the base metal adjacent to weldments due to high through-thickness strains introduced by weld metal shrinkage in highly restrained joints. Tearing occurs by decohesion and linking along the working direction of the base metal; cracks usually run ...

A substance that reduces the surface tension of a liquid, thereby causing it to spread more readily on a solid surface.

An electrolytic cell, the electromotive force of which is due to a difference in air (oxygen) concentration at one electrode as compared with that at another electrode of the same material; an oxygen concentration cell (a cell resulting from a potential d ...

(1) A cathode, usuully corrugated to give variable current densities, that is plated at low current densities to preferentially remove impurities from a plating solution. (2) A substitute cathode that is used during adjustment of operating conditions.

See ferrite.

(1) A solid solution of one or more elements in body-centered cubic iron. Unless otherwise designated (for instance, as chromium ferrite), the solute is generally assumed to be carbon. On some equilibrium diagrams, there are two ferrite regions separated ...

A raised area, often dome shaped, resulting from (1) loss of adhesion between a coating or deposit and the base metal or (2) delamination under the pressure of expanding gas trapped in a metal in a near-subsurface zone. Very small blisters may be called p ...

A coating developed on a metal surface by a high temperature diffusion process (as carburization, calorizing, or chromizing).

An electrode widely used as a reference electrode of known potential in electrometric measurement of acidity and alkalinity, corrosion studies, voltammetry, and measurement of the potentials of other electrodes. See also electrode potential, reference ele ...

Corrosion that is accompanied by a flow of electrons between cathodic and anodic areas on metallic surfaces.

The stress at which a material exhibits a specified deviation from proportionality of stress and strain. An onset of 0.2% is used for many metals.

The size of a flaw (defect) in a structure that will cause failure at a particular stress level.

Embrittlement of ultrahigh-strength steels caused by tempering in the temperature range of 205 to 400

Removal of dissolved mineral matter, generally from water.