Gold Plating

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Gold Plating


the process of applying layers of gold (from tenths of a micron to two or three microns thick; up to 20–25 μm in certain critical circumstances) to the surfaces of articles, designs, and architectural structures.

The so-called sheet method of gold plating was used in ancient Egypt. It involved sticking from one to three layers of the finest petals of gold onto the prepared surface of an article. The method was used widely in Kievan Rus’ beginning with the tenth and 11th centuries A.D. By the 19th century the iron or copper cupolas of churches and the roofs and spires of palaces were gilded by this method. The lifetime of such sheet gold coverings was about 50 years. Later, the firing method came into use. Here, a dough-like paste consisting of an amalgam of gold (a compound of gold and mercury) was applied to a surface. When the article (made of porcelain or metal) was heated, the mercury vaporized and a compact gold covering remained. Such coverings last 100 to 150 years. The galvanic method has been used since the middle of the 19th century. Here, the gold is precipitated onto the surface from a solution of dicyanoaurate KAu(CN)2. Such a covering is very stable chemically, possesses high thermal and electrical conductivity, and is used not only in jewelry and watch-making, but also in the electronics industry—mainly to cover the electrical contacts of electronic computers. The galvanic method is used not only for gold plating but also for coatings made of compounds of gold with silver, antimony, nickel, cobalt, copper, and other elements. Such coatings approximately double the hardness of a surface and are a good means of protecting surfaces against corrosion.


References in periodicals archive ?
The watch that is designed to be worn all day or night during any activity gets a touch of style when gold plated says the spokesperson of Dr.
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Gold & Co London unveiled their new version of the 64GB 3G and Wifi enabled device plated in 24ct Gold and showcased it alongside their 24ct Gold Plated 32GB iPhone 4.
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Besides the new wire PTFE coatings, Fort Wayne Metals has added three types of wire to its product line: tungsten, gold plated tungsten and gold plated molybdenum.
45 Colt Single Action Army revolvers with the 101 Ranch brand crudely stamped on the side frame were gold plated and heavily used in exhibition shooting by Roy in his live performances.
The 22-karat gold or white gold plated Iris is exuberant and is aimed at the woman who likes to dress in style or enjoys dressing up for a big occasion.
They are: one silver coin and two bronze coins from the 25th De Beers Diamond Research conference 1975; seven Treasures of the Aztecs medals; one gold medallion, one gold plated sterling silver and one sterling silver featuring the Churchill Centenaryportrait; one coin of unknown metal from the United States Bi-Centennial visit of July 1976; one Winnie the Pooh medal and a hand enamelled five shilling Balliwick of Jersey 1066-1966 medallion.
PHOTO : "Tabernacle" and "Cross" by Emil Telizyn bronze, enameled and gold plated cross, 3', tabernacle, 30" x 24" x 24" MST Bronze Unlimited
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