noble metals - definição. O que é noble metals. Significado, conceito
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O que (quem) é noble metals - definição

METAL RESISTANT TO CORROSION AND OXIDATION IN MOIST AIR, E.G. RUTHENIUM, RHODIUM, PALLADIUM, SILVER, OSMIUM, IRIDIUM, PLATINUM, AND GOLD
Noble Metal; Noble Metals; Noble metals

Noble metal         
A noble metal is ordinarily regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in nature in its raw form. Gold, platinum, and the other platinum group metals (ruthenium, rhodium, palladium, osmium, iridium) are most often so classified.
noble metal         
¦ noun Chemistry a metal (e.g. gold, silver, or platinum) that resists attack by acids and other reagents and does not corrode.
Permanente Metals         
AMERICAN SHIPBUILDING COMPANY
Permanente Metals Corporation; Permanente Metals Corp.; Permanente Metals Company; Todd-California Shipbuilding Corporation; Todd California Shipbuilding Corporation
Permanente Metals Corporation (PMC) is best known for having managed the Richmond Shipyards in Richmond, California, owned by one of industrialist Henry J. Kaiser's many corporations, and also engaged in related corporate activities.

Wikipédia

Noble metal

A noble metal is ordinarily regarded as a metallic chemical element that is generally resistant to corrosion and is usually found in nature in its raw form. Gold, platinum, and the other platinum group metals (ruthenium, rhodium, palladium, osmium, iridium) are most often so classified. Silver, copper and mercury are sometimes included as noble metals, however less often as each of these usually occurs in nature combined with sulfur.

In more specialized fields of study and applications the number of elements counted as noble metals can be smaller or larger. In physics, there are only three noble metals: copper, silver and gold. In dentistry, silver is not always counted as a noble metal since it is subject to corrosion when present in the mouth. In chemistry, the term noble metal is sometimes applied more broadly to any metallic or semimetallic element that does not react with a weak acid and give off hydrogen gas in the process. This broader set includes copper, mercury, technetium, rhenium, arsenic, antimony, bismuth and polonium, as well as gold, the six platinum group metals, and silver.