One of the relatively scarce and valuable metals: gold, silver, and the platinum-group metals. Also called noble metal(s).

Corrosion resulting from direct current flow through paths other than the intended circuit. For example, by an extraneous current in the earth.

That type of force that causes or tends to cause two contiguous parts of the same body to slide relative to each other in a direction parallel to their plane of contact.

The reversible potential for an electrode process when all products and reactions are at unit activity on a scale in which the potential for the standard hydrogen half-cell is zero.

Resin formed by the reaction of bisphenol and epichlorohydrin.

Corrosion testing in a boiling solution of nitric acid. This test is mainly used to detect the susceptibilty to intergranular corrosion of stainless steel.

The potential of a specimen (or specimens in a galvanic couple) when two or more electrochemical reactions are occurring. Also called galvanic couple potential.

Corrosion potential in the absence of net electrical current flowing to or from the metal surface.

Hardening caused by the precipitation of a constituent from a supersaturated solid solution. See also age hardening and aging.

A loss in ductility accompanied by an increase in hardness and strength that occurs when low-carbon steel (especially rimmed or capped steel) is aged following plastic deformation. The degree of embrittlement is a function of aging time and temperature, o ...

The property that enables a material to undergo permanent deformation without rupture.

A corrosion test involving exposureof specimens at controlled levels of humidity and temperature. Contrast with salt-fog test.

A conjoint action involving corrosion and erosion in the presence of a moving corrosive fluid, leading to the accelerated loss of material.

Pertains to the machining characteristics of an alloy to which one or more ingredients have been introduced to give small broken chips, lower power consumption, better surface finish, and longer tool life; among such additions are sulfur or lead to steel, ...

See principal stress (normal).

The first coat of paint applied to a surface. Formulated to have good bonding and wetting characteristics; may or may not contain inhibiting pigments.

An increase in hardness and strength caused by plastic deformation at temperatures below the recrystallization range.

See corrosion potential and open-circuit potential.

The formation of blisters on or below a metal surface from excessive internal hydrogen pressure; Formation of blister-like bulges on a ductile metal surface caused by internal hydrogen pressures. Hydrogen may beformed during cleaning, plating, corrosion, ...

See embrittlement.