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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.
In creating jewellery, gemstones, coins, or other precious items are often used, and they are typically set into precious metals. Platinum alloys range from 900 (90% pure) to 950 (95% pure). The silver used in jewellery is usually sterling silver, or 92.5% fine silver. In costume jewellery, stainless steel findings are sometimes used.
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 ...
The basic design of cut steel jewellery is a thin metal baseplate onto which closely placed steel studs were riveted or scewed. [3] [4] The baseplate could be made from various metals such as brass, tin or silver alloys. [3] Early cut steel consisted of individual steel studs that had been polished and inserted into metal frames. [1]
A similar-looking type of jewellery can be made from small pieces of cut steel. [3] [1] The cut and polished marcasite pieces reflect light at different angles from its different facets giving it a sparkle. [4] Thailand is one of the large producers of modern marcasite jewellery in silver. [citation needed]
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