A powerfully oxidizing allotropic form of the element oxygen. The ozone molecule contains three atoms (O3). Ozone gas is decidedly blue, and both liquid and solid ozone are an opaque blue-black color, similar to that of ink.

A black finish on a metal produced by immersing it in hot oxidizing salts or salt solutions.

(1) The removal of oxygen from molten metals by use of suitable deoxidixers. (2) Sometimes refers to the removal of undesirable elements other than oxygen by the introduction of elements or compounds that readily react with them. (3) In metal finishing, t ...

Pertaining to the body-centered cubic crystal structure (BCC) of many ferrous (iron-base) metals.

Pitting corrosion resulting from deposits on a metal surface which cause concentration cells.

A type of inhibitor that appreciably changes the potential of u metal to a more noble (positive) value.

The electroplating of zinc upon iron or steels

A pattern of parallel surface cracks that are formed by alternate rapid heating and cooling of the extreme surface metal, sometimes found on forging dies and piercing punches. There may be two sets of parallel cracks one set perpendicular to the other.

(1) A cell, the emf of which is due to the potential difference between a metal in an active state and the same metal in a passive state. (2) A corrosion cell in which the anode is a metal in the active state and the cathode is the same metal in the passi ...

Cracking that occurs in the weld metal. See also cold cracking, hot cracking, lamellar tearing, and stress-relief cracking.

(1) A metal corroding under the control of a surface reaction product. (2) The state of the metal surface characterized by low corrosion rates in a potential region that is strongly oxidizing for the metal. (3) The state of a metal when its behavior is mu ...

Embrittlement of stainless steels upon extended exposure to temperatures between 400 and 510

The algebraic ratio of two specified stress values in a stress cycle. Two commonly used stress ratios are: (1) the ratio of the alternating stress amplitude to the mean stress. A = Sa/Sm and (2) the ratio of the minimum stress to the maximum stress. R =Sm ...

The ratio of the electric current density to the electric field in a material. Also called electrical conductivity or specific conductance.

A substance that produces depolarization.

A measure of proportion by weight, equivalent to one unit weight of a material per billion (109) unit weights of compound. One part per billion is equivalent to 1 mg/kg.

The stress that will cause fracture in a creep test at a given time in a specified constant environment. Also called stress-rupture strength.

The electrolyte adjacent to the cathode of an electrolytic cell.

(1) The relationship between the current density at a point on a surface and its distance from the counter electrode. The greater the ratio of the surface resistivity shown by the electrode reaction to the volume resistivity of the electrolyte, the better ...

The range of the stress-intensity factor during a fatigue cycle.