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Palladium to make fantastic labels |
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| Release time:2013-05-07 Source:admin Reads: | |
| Many pendants are made from precious metals such as gold, platinum or palladium, actually, Rhodium can also be made into metal labels. It is a chemical element that is a rare, silvery-white, hard, and chemically inert transition metal and a member of the platinum group. It has the chemical symbol Rh and atomic number 45. It is composed of only one naturally-occurring isotope, 103Rh. It is one of the rarest and most valuable precious metals. Rhodium is a so-called noble metal, resistant to corrosion, found in platinum- or nickel ores together with the other members of the platinum group metals. It was discovered in 1803 by William Hyde Wollaston in one such ore, and named for the rose color of one of its chlorine compounds, produced after it reacted with the powerful acid mixture aqua regia.The element's major use is as one of the catalysts in the three-way catalytic converters in automobiles. Because rhodium metal is inert against corrosion and most aggressive chemicals, and because of its rarity, rhodium is usually alloyed with platinum or palladium and applied in high-temperature and corrosion-resistive metal labels. White gold is often plated with a thin rhodium layer to improve its appearance while sterling silver is often rhodium plated for tarnish resistance. Rhodium finds use in jewelry and for decorations. It is electroplated on white gold and platinum to give it a reflective white surface. This is known as rhodium flashing in the jewelry business. It may also be used in coating sterling silver to protect against tarnish, which is silver sulfide produced from the atmospheric hydrogen sulfide. Solid rhodium jewelry is very rare, because the metal has high melting point and poor malleability rather than due to its high price. Additionally, its high cost assures that most of its jewelry metal labels is in the form of tiny amounts of powder dissolved into electroplating solutions. Rhodium has also been used for honors or to symbolize wealth, when more commonly used metals such as silver, gold, or platinum are deemed insufficient. |
