Everything about Cupronickel totally explained
Cupronickel or
Coppernickel is an
alloy of
copper,
nickel and strengthening impurities, such as
iron and
manganese. Cupronickel doesn't
corrode in
seawater, because its
electrode potential is adjusted to be neutral with regard to seawater. Because of this it's used for marine hardware, and sometimes for the
propellers,
crankshafts and
hulls of premium
tugboats,
fishing boats and other working
boats.
A common use is in many silver-coloured modern circulation
coins. A typical mix is 75% copper, 25%
nickel, and a trace amount of
manganese. In the past true
silver coins were
debased with cupronickel. Despite high copper content the colour of cupro-nickel is silver.
It is used in
thermocouples, and a 55% copper/45% nickel alloy is used to make very accurate
resistors.
Monel metal is a nickel-copper alloy, containing minimum 63% nickel.
See also
bronze (copper alloyed with
tin),
brass (copper alloyed with
zinc), and
nickel silver (another group of copper-nickel alloys).
History
The cupronickel alloy technology has been known by the
Chinese since the
3rd century BC under the name "white copper" (some weapons from the
Warring States Period were in copper-nickel alloy ).
The
Greco-Bactrian kings
Agathocles and
Pantaleon were the first in the world to issue copper-nickel (75/25 ratio) coins around
170 BC, suggesting that exchanges of the metallic alloy, or possibly exchanges of technicians, were happening at the time between China and the region of
Bactria. The practice of exporting Chinese metals, in particular
iron, for trade is attested around that period.
Cupro-nickel wasn't used again in coinage until the
19th century. Cupro-nickel is the
cladding on either side of
United States Half Dollars (50¢) since 1971, and all
quarters (25¢) and
dimes (10¢) made after 1965. The United States
Jefferson Nickel (5¢) coin is solid cupro-nickel (75/25 ratio).
Beginning around the turn of the 20th century,
bullet jackets were commonly made from this material. It was soon replaced with
gilding metal to reduce metal fouling in the bore.
Further Information
Get more info on 'Cupronickel'.
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