electroplating


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plating

plating, application of a plate, or coat, of metal to a surface for decoration, reflection of light, protection against corrosion, or increased wearing quality. The practice is of ancient origin: gilding was developed early; the Romans soldered silver plates to articles of baser metals; and in the 5th cent. a process was described where iron weapons were coated with copper by dipping them in a copper solution. In the 18th cent. the plating of copper or brass with silver by fusion was originated in England (see Sheffield plate). Plating by electrolysis, or electroplating, is the most common method because it permits the control of the thickness of the plating. Cadmium, zinc, silver, gold, tin, copper, nickel, and chromium are the most frequently used plating metals. Any of the common metals and some nonmetals, e.g., plastics, with suitably prepared surfaces can be used as a base. In electroforming, a mold made of specially prepared wax is electroplated. The wax is then melted and the plating itself constitutes the finished product. The part to be plated may be dipped in molten metal. For example, molten zinc is used in galvanizing; lead-tin alloy, in terneplating; and tin, in tinning. Without electricity, some metals can be precipitated from chemical solutions onto the surface of plastics or metals. A powdered, liquid, or gaseous plating metal can be made to diffuse into a heated base-metal surface. Sherardizing is the diffusion coating of zinc on steel; chromizing, chromium on steel; and calorizing, aluminum on steel. The application by welding or brazing of a sheet or plate to the base metal is called cladding. Decorative metal coatings are applied to plastic by vapor deposition. The metal, usually aluminum, and the plastic parts are put in a vacuum chamber. When the aluminum is vaporized by a surge of electricity, the particles settle on any exposed surface. Worn parts can be sprayed with molten metal to build them up to their original dimensions. Iron or steel is best protected from corrosion by a coating of cadmium or zinc, which oxidizes, creating a protective coat for the underlying material. Parts such as automobile bumpers usually have an undercoating of copper, a protective layer of nickel, and a thin, shiny surface layer of chromium for decoration. In the manufacture of phonograph records an original recording is made on a metal disk coated with lacquer, which is then plated. From the plated master a die is made to be used in a hydraulic press. The silvering of mirrors is a type of plating in which silver is precipitated chemically on glass.
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electroplating

[i′lek·trō‚plād·iŋ]
(metallurgy)
Electrodeposition of a metal or alloy from a suitable electrolyte solution; the article to be plated is connected as the cathode in the electrolyte solution; direct current is introduced through the anode which consists of the metal to be deposited.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
According to the Industry Consultant's Report, Kimou is the largest electroplating industrial park developer and operator in China in terms of total revenue in 2018.
K2 Partners Inc., a Florida corporation, has provided regional powder coating and electroplating services to customers in Texas and Florida since 1994.
Thus, the coating thickness and the deposition rate are key quality factors in electroplating. Nevertheless, in industrial praxis, they are only randomly checked by measurement on the workpiece or on a test specimen.
Ni electroplating has also been investigated in detail within the context of electrodeposition of Ni-based composites and alloys.
The reduction in the fatigue strength was more in chromium electroplating than tungsten carbide coating [15].
Electroplating plant site for another use like additional parking for School 7.
Technological developments have enabled use of electroplating processes in several end-use applications, including corrosion protection, decorative purposes, engineering applications and electrical applications.
Det Sgt Dean Jones, from Coventry's Acquisitive Crime Team, said: "The company tell us that the solution used for electroplating is extremely toxic.
Det Sgt Dean Jones, of Coventry Police, said: "The company tell us that the solution used for electroplating is extremely toxic; the thieves may not be aware of the danger it poses and the unsuspecting public need to be made aware in case the thieves try to sell the silver on.
Detective Sergeant Dean Jones, from Coventry's Acquisitive Crime Team, said: "The company tell us that the solution used for electroplating is extremely toxic.
In addition to learning the machine and electroplating trades, Mr.