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2. Gold–aluminium intermetallic - Wikipedia

   en.wikipedia.org/wiki/Gold–aluminium_intermetallic

   (1) Gold wire (2) Purple plague (3) Copper substrate (4) Gap eroded by wire-bond (5) Aluminium contact Gold–aluminium phase diagram. Gold–aluminium intermetallic is a type of intermetallic compound of gold and aluminium that usually forms at contacts between the two metals. Gold–aluminium intermetallic have different properties from the ...

3. Rust converter - Wikipedia

   en.wikipedia.org/wiki/Rust_converter

   Rust converters are chemical solutions or primers that can be applied directly to an iron or iron alloy surface to convert iron oxides into a protective chemical barrier. These compounds interact with iron oxides, especially iron(III) oxide , converting them into an adherent black layer ( black oxide ) that is more resistant to moisture and ...

4. Pickling (metal) - Wikipedia

   en.wikipedia.org/wiki/Pickling_(metal)

   Pickling is a metal surface treatment used to remove impurities, such as stains, inorganic contaminants, and rust or scale from ferrous metals, copper, precious metals and aluminum alloys. [1] A solution called pickle liquor , which usually contains acid , is used to remove the surface impurities.

5. Surface finishing - Wikipedia

   en.wikipedia.org/wiki/Surface_finishing

   Also known as a mirror finish. This finish is produced by polishing with at least a 320 grit belt or wheel finish. Care will be taken in making sure all surface defects are removed. The part is sisal buffed and then color buffed to achieve a mirror finish. The quality of this finish is dependent on the quality of the metal being polished.

6. Polishing (metalworking) - Wikipedia

   en.wikipedia.org/wiki/Polishing_(metalworking)

   The removal of oxidization (tarnish) from metal objects is accomplished using a metal polish or tarnish remover; this is also called polishing. To prevent further unwanted oxidization, polished metal surfaces may be coated with wax, oil, or lacquer. This is of particular concern for copper alloy products such as brass and bronze. [2]

7. Gold vs. silver investing: Which is better when interest ...

   www.aol.com/gold-vs-silver-investing-better...

   Gold and silver are both precious metal assets worth investing in, but one could be a better bet right now. / Credit: Getty Images/iStockphoto Until recently, inflation had been high in the U.S.