Nickel silver, Mailechort, German silver, Argentan, new silver, nickel brass, albata, alpacca, or electrum is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. The name "German silver" refers to its development by 19th-century German metalworkers in imitation of the Chinese alloy known as paktong (cupronickel). All modern, commercially important nickel silvers (such as those standardized under ASTM B122) contain significant amounts of zinc, and are sometimes considered a subset of brass.
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History
Nickel silver was first known and used in China. During the Qing dynasty, it was "smuggled into various parts of the East Indies", despite a government ban on the export of nickel silver. It became known in the west from imported wares called bai-tong or paktong (??, literally "white copper"), for which the silvery metal colour was used to imitate sterling silver. According to Berthold Laufer, it was identical with khar sini, one of the seven metals recognized by J?bir ibn Hayy?n.
In Europe, consequently, it was at first called paktong, which is about the way pai t'ung is pronounced in the Cantonese dialect. The earliest European mention of paktong occurs in the year 1597. From then until the end of the eighteenth century there are references to it as having been exported from Canton to Europe. German imitations of paktong, however, began to appear from about 1750 onward. In 1770 the Suhl (Germany) metalworks were able to produce a similar alloy. In 1823 a German competition was held to perfect the production process: the goal was to develop an alloy that possessed the closest visual similarity to silver. The brothers Henniger in Berlin and Ernst August Geitner in Schneeberg independently achieved this goal. The manufacturer Berndorf named the trademark brand Alpacca, which became widely known in northern Europe for nickel silver. In 1830 the German process of manufacture was introduced into England, while exports of paktong from China gradually stopped. That is why today the alloy has lost its original name (paktong) and is generally known as German silver. In 1832, a form of German silver was also developed in Birmingham, England.
After 1840, the development of electroplating caused nickel silver to become widely used. It formed an ideal, strong and bright substrate for the plating process. It was also used unplated in applications such as cheaper grades of cutlery.
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Uses
Nickel silver first became popular as a base metal for silver-plated cutlery and other silverware, notably the electroplated wares called EPNS (electro-plated nickel silver). It is used in zippers, better-quality keys, costume jewellery, for making musical instruments (e.g., flutes, clarinets), and is preferred for the track in electrically powered model railway layouts, as its oxide is conductive. It is widely used in the production of coins (e.g. Portuguese escudo and the former GDR marks). Its industrial and technical uses include marine fittings and plumbing fixtures for its corrosion resistance, and heating coils for its high electrical resistance.
In the 19th century, particularly after 1868, Plains Indian jewelers were able to easily acquire sheets of German silver. They used them to cut, stamp, and cold hammer a wide range of accessories and also horse gear. Continuing into the present, Plains metalsmiths have used German silver for pendants, pectorals, bracelets, armbands, hair plates, conchas (oval decorative plates for belts), earrings, belt buckles, necktie slides, stickpins, dush-tuhs, and tiaras. Nickel silver is the metal of choice among contemporary Kiowa and Pawnee metalsmiths in Oklahoma. Many of the metal fittings on modern higher-end equine harness and tack are of nickel silver.
Early in the twentieth century, German silver was used by automobile manufacturers before the advent of steel sheet metal; for example, the famous Rolls-Royce Silver Ghost of 1907. After about 1920, its use became widespread for pocketknife bolsters, due to its machinability and corrosion resistance. Prior to this point, the most common metal was iron.
Musical instruments, including the flute, saxophone, trumpet, and French horn, can be made of nickel silver. Many professional-level French horns are entirely made of nickel silver. Some saxophone manufacturers, such as Keilwerth, offer saxophones made of nickel silver (Shadow model); these are far rarer than traditional lacquered brass saxophones. Student-level flutes and piccolos are also made of silver-plated nickel silver, although upper-level models are likely to use sterling silver. It is said to produce a bright and powerful sound quality; an additional benefit is that nickel silver is harder and has more corrosion resistance than brass. Because of its hardness, it is the most commonly used material for woodwind keys. Most clarinets, flutes, oboes and similar wind instruments have nickel silver keys, normally silver-plated. It is used to produce the tubes (called staples) onto which oboe reeds are tied. Many parts of brass instruments are made of nickel silver, such as tubes, braces or valve mechanism. Trombone slide of many manufacturers offer lightweight nickel silver (LT slide) option for faster slide action and weight balance. It was used in the construction of the National tricone resophonic guitar. The frets of guitar, mandolin, banjo, bass, and related string instruments are typically made of nickel silver. Nickel silver is sometimes used as ornamentation on the great highland bagpipe.
Nickel silver is also used in art. The Dutch Sculptor Willem Lenssinck has made several objects in German silver. Outdoor art made from this material can easily stand against all kinds of weather influences.
Fraudulent uses
Counterfeiters have used nickel silver to produce coins and medallions purporting to be silver rounds, generally in an attempt to trick unsuspecting buyers into paying prices based on the spot price of silver. The metal has also been used to produce counterfeit Morgan dollars.
Nickel silver fraud has included the production of replica bullion bars, marked "Nickel Silver" or "German Silver", in weights of one troy ounce. They are sold without notification that they contain no elemental silver.
Toxicity
According to the Merck Manual, prolonged contact of copper alloys with acidic food or beverages (including boiling milk) can leach out the copper and cause toxicity. Long-term, low doses can lead to cirrhosis.
Source of the article : Wikipedia
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