ASTM B374-96

NOTICE: This standard has either been superceded and replaced by a new version or discontinued. NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
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Designation: B 374 – 96 Endorsed by American
Electroplaters’ Society
Endorsed by National
Association of Metal Finishers
Standard Terminology Relating to
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Electroplating
This standard is issued under the fixed designation B 374; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
These definitions correspond to interpretations as applied to electroplating and do not necessarily
correspond to the definitions used in other fields.
abrasive blasting—a process for cleaning or finishing by anode efficiency—current efficiency of a specified anodic
means of an abrasive directed at high velocity against the process.
work piece. anode film—(1) the layer of solution in contact with the anode
activator—in diffusion coatings, a chemical, usually a halide that differs in composition from that of the bulk of the
salt, that enters into a reaction with the source or master solution.
alloy, depositing the source on the substrate.
(2) The outer layer of the anode itself consisting of oxidation
activation—elimination of a passive condition on a surface.
or reaction products of the anode metal.
activity (ion)—the ion concentration corrected for deviations
anode polarization— See polarization.
from ideal behavior. Concentration multiplied by activity
anodic coating—a protective, decorative, or functional coat-
coefficient.
ing, formed by conversion of the surface of a metal in an
addition agent—a material added in small quantities to a
electrolytic oxidation process.
solution to modify its characteristics. It is usually added to a
anodizing—an electrolytic oxidation process in which the
plating solution for the purpose of modifying the character of
surface of a metal, when anodic, is converted to a coating
a deposit.
having desirable protective, decorative, or functional prop-
adhesion—the attractive force that exists between an elec-
erties.
trodeposit and its substrate that can be measured as the force
anolyte—the portion of electrolyte in the vicinity of the anode;
required to separate an electrodeposit and its substrate.
in a divided cell, the portion of electrolyte on the anode side
adhesion, practical, n—the force or work required to detach
of the diaphragm.
or remove a coating from the underlayer or substrate; it can
anti-pitting agent—an addition agent for the specific purpose
be measured in terms of peel, pull, or shear strength as an
of preventing gas pits in a deposit.
experimentally determined quantity.
autocatalytic plating—deposition of a metal coating by a
aluminizing—forming of an aluminum or aluminum alloy
controlled chemical reduction, catalyzed by the metal or
coating on a metal by hot dipping, hot spraying, or diffusion.
alloy being deposited.
amorphous—noncrystalline, or devoid of regular structure.
automatic machine (or conveyor)—a machine for mechani-
ampere—the current that will deposit silver at the rate of
cally processing parts through treatment cycles, such as
0.0011180 g/s. Current flowing at the rate of 1 C/s.
cleaning, anodizing, or plating.
−8
˚
angström unit (A)—10 cm.
automatic plating: (1) full—plating in which the cathodes are
anion—a negatively-charged ion.
automatically conveyed through successive cleaning and
anode—the electrode in electrolysis, at which negative ions
plating tanks.
are discharged, positive ions are formed, or other oxidizing
(2) semi—plating in which the cathodes are conveyed
reactions occur.
automatically through only one plating tank.
anode corrosion—dissolution of anode metal by the electro-
auxiliary anode—a supplementary anode employed during
chemical action in an electrolytic cell.
electrodeposition to achieve a desired thickness distribution
of the deposit.
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auxiliary cathode—See thief.
This terminology is under the jurisdiction of ASTM Committee B-8 on Metallic
and Inorganic Coatings and is the direct responsibility of Subcommittee B08.01on
back emf (electromotive force)—the potential set up in an
Ancillary Matters.
electrolytic cell that opposes the flow of current, caused by
Current edition approved May 10, 1996. Published July 1996. Originally
such factors as concentration polarization and electrode
published as B 374 – 61 T. Last previous edition B 374 – 93a.
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