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  2. Gold plating - Wikipedia

    en.wikipedia.org/wiki/Gold_plating

    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. This process may take months and even years, depending on the thickness ...

  3. Gold leaf - Wikipedia

    en.wikipedia.org/wiki/Gold_leaf

    A gold nugget of 5 mm (0.2 in) in diameter (bottom) can be expanded through hammering into a gold foil of about 0.5 m 2 (5.4 sq ft). The Toi gold mine museum, Japan.. Gold leaf is gold that has been hammered into thin sheets (usually around 0.1 μm thick [1]) by a process known as goldbeating, [2] for use in gilding.

  4. Plating - Wikipedia

    en.wikipedia.org/wiki/Plating

    Gold plating is a method of depositing a thin layer of gold on the surface of glass or metal, most often copper or silver. Gold plating is often used in electronics, to provide a corrosion-resistant electrically conductive layer on copper, typically in electrical connectors and printed circuit boards. With direct gold-on-copper plating, the ...

  5. Gilding - Wikipedia

    en.wikipedia.org/wiki/Gilding

    "Overlaying" or folding or hammering on gold foil or gold leaf is the simplest and most ancient method, and is mentioned in Homer's Odyssey [8] and the Old Testament. The Ram in a Thicket (2600–2400 BC) from Ur describes this technique used on wood, with a thin layer of bitumen underneath to help adhesion.

  6. Metal leaf - Wikipedia

    en.wikipedia.org/wiki/Metal_leaf

    Gilding is the process of applying a thin layer of metal on another surface. Goldbeating , the technique of producing metal leaves, has been known for more than 5,000 years. A small gold nugget 5 mm in diameter can be expanded to about 20,000 times its initial surface through hammering, producing a gold foil surface of about one half square ...

  7. Thin film - Wikipedia

    en.wikipedia.org/wiki/Thin_film

    A thin film is a layer of materials ranging from fractions of a ... This encompasses ca. 100 nm thin gold leaves that were already used in ancient India more than ...

  8. Electroless nickel immersion gold - Wikipedia

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

    The gold is typically applied by quick immersion in a solution containing gold salts. 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]

  9. Diffusion barrier - Wikipedia

    en.wikipedia.org/wiki/Diffusion_barrier

    As for gold its virtue relies in its inertness, and ease of application; its problem is its cost. Chromium has excellent adhesion to many materials because of its reactivity. Its affinity for oxygen forms a thin stable oxide coat on the outer surface, creating a passivation layer which prevents further oxidation of the chromium, and of the ...

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