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  2. Gold plating - Wikipedia

    en.wikipedia.org/wiki/Gold_plating

    Gold plated - gold layer thickness greater than or equal to 0.5 micron; Heavy gold plated / Vermeil - gold layer thickness greater than or equal to 2.5 micron; Gold plated silver jewellery can still tarnish as the silver atoms diffuse into the gold layer, causing slow gradual fading of its color and eventually causing tarnishing of the surface ...

  3. Electroless nickel immersion gold - Wikipedia

    en.wikipedia.org/wiki/Electroless_nickel...

    Some of the nickel is oxidized to Ni 2+ while the gold is reduced to metallic state. A variant of this process adds a thin layer of electroless palladium over the nickel, a process known by the acronym ENEPIG. [1] ENIG can be applied before or after the solder mask, also known as "overall" or "selective chemical Ni/Au," respectively. The latter ...

  4. Costume jewelry - Wikipedia

    en.wikipedia.org/wiki/Costume_jewelry

    Metals include gold- or silver-plated brass, and sometimes vermeil or sterling silver. Lower-priced jewelry may still use gold plating over pewter, nickel, or other metals; items made in countries outside the United States [dubious – discuss] may contain lead. Some pieces incorporate plastic, acrylic, leather, or wood.

  5. Plating - Wikipedia

    en.wikipedia.org/wiki/Plating

    Plating is a finishing process in which a metal is deposited on a surface. Plating has been done for hundreds of years; it is also critical for modern technology. Plating is used to decorate objects, for corrosion inhibition, to improve solderability, to harden, to improve wearability, to reduce friction, to improve paint adhesion, to alter conductivity, to improve IR reflectivity, for ...

  6. Electroplating - Wikipedia

    en.wikipedia.org/wiki/Electroplating

    Electroplating of acid gold on underlying copper- or nickel-plated circuits reduces contact resistance as well as surface hardness. Copper-plated areas of mild steel act as a mask if case-hardening of such areas are not desired. Tin-plated steel is chromium-plated to prevent dulling of the surface due to oxidation of tin.

  7. Colored gold - Wikipedia

    en.wikipedia.org/wiki/Colored_gold

    A common white gold formulation consists of 90% wt. gold and 10% wt. nickel. [4] Copper can be added to increase malleability. [3] To give it a shiny finish and brightness sometimes it plated with rhodium. [6] The alloys used in the jewelry industry are gold-palladium-silver and gold-nickel-copper-zinc.

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