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

(1) Hardening suitable a = b alloys (most often certain copper or titanium alloys) by solution treating and quenching to develop a martensite-like structure. (2) In ferrous alloys, hardening by austenitizing and then cooling at a rate such that a substant ...

Corrosion resulting from a cathodic condition of a structure usually caused by the reaction of an amphoteric metal with the alkaline products of electrolysis.

An anode that is insoluble in the electrolyte under the conditions prevailing in the electrolysis.

The portion of solution in immediate contact with the cathode during electrolysis.

(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 ...

Current efficiency at the cathode.

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

A treatment of metal in a solution of a hexavalent chromium compound to produce a conversion coating consisting of trivalent and hexavalent chromium compounds.

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.

(Galvanic Corrosion) Corrosion resulting from dissimilar metal contact.

A process in which metal ions in a dilute aqueous solution are plated out on a substrate by means of autocatalytic chemical reduction.

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

The selective corrosion of one or more components of a solid solution alloy, usually in the form of ions. Also called parting or selective leaching. See also decarburization, decobaltification, denickelification, dezincification, and graphitic corrosion.

The destruction of adhesion between a coating and its substrate by products of a cathodic reaction.

A metastable lamellar aggregate of ferrite and cementite resulting from the transformation of austenite at temperatures above the bainite range.

Electrolytic pickling in which the work is the cathode.

An instrument for indicating or measuring a small electric current by means of a mechanical motion derived from electromagnetic or electrodynamic forces produced by the current.

A pair of dissimilar conductors, commonly metals, in electrical contact. See also galvanic corrosion.

An electrode commonly used in polarization studies to pass current to or from a test electrode, usually made of noncorroding material