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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. Tumbaga - Wikipedia

   en.wikipedia.org/wiki/Tumbaga

   Tumbaga is an alloy composed mostly of gold and copper. It has a significantly lower melting point than gold or copper alone [citation needed]. It is harder than copper, but maintains malleability after being pounded. Tumbaga can be treated with a carboxylic acid, such as oxalic acid, to dissolve copper off the surface. What remains is a shiny ...

4. 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.

5. Electroless nickel immersion gold - Wikipedia

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

   Electroless nickel immersion gold (ENIG or ENi/IAu), also known as immersion gold (Au), chemical Ni/Au or soft gold, is a metal plating process used in the manufacture of printed circuit boards (PCBs), to avoid oxidation and improve the solderability of copper contacts and plated through-holes.

6. Copper electroplating - Wikipedia

   en.wikipedia.org/wiki/Copper_electroplating

   While copper may be used as the final decorative surface layer, it is usually subsequently plated with other metals that are more resistant to wear or tarnish such as chromium, nickel, or gold; in this case, the brightness of the copper undercoat enhances the appearance of the subsequent finish layer. [5]

7. US supply chain task force to discuss Baltimore bridge collapse

   www.aol.com/news/us-supply-chain-task-force...

   A U.S. federal supply chain task force will meet on Wednesday to assess the Baltimore bridge collapse and port closure, U.S. Treasury Secretary Janet Yellen said, adding that the Biden ...