Silver Plate
Gold plating & Silver plating
Gold plating is a method of depositing a thin layer of gold on the surface of other metal, most oftentimes copper or silver. Gold plating is many times used in electronics, to provide a corrosion-resistant electrically conductive layer on copper, specifically in electrical connectors and printed circuit boards. With direct gold-on-copper plating, the copper molecules have the tendency to diffuse through the gold layer, causing tarnishing of it is surface and formation of an oxide/sulfide layer. A layer of a suitable barrier metal, normally nickel, has accordingly to be deposited on the copper substrate, forming a copper-nickel-gold sandwich. Metals may also be coated with gold for ornamental purposes, using a number of dissimilar processes ordinarily referred to as gilding.
For less demanding apps in electronics, silver is oftentimes applied as a for less substitute for gold. (Although silver is a better conductor than gold it does oxidize and so gold is better for contacts. However, variable capacitors are considered of the most eminent quality when they have silver plated plates. In this application there is no make and break contact so gold would not offer any vantage over silver). Care will have to be used for elements exposed to high humidity environments. When the silver layer is porous or holds cracks, the underlying copper undergoes rapid galvanic corrosion, flaking off the plating and exposing the copper itself; a procedure known as red plague. Historically, silver plate was employed to provide a for less version of items that might other than as supposed or expected be made of silver, including cutlery and candlesticks. The earliest kind was Old Sheffield Plate, but in the 19th century new methods of production (including electroplating) were introduced: see Sheffield Plate. Another method that may be employed to implement a thin layer of silver to assorted objects, such as glass, is the Tollen's Test method, which commonly is prepared as follows. Using this method the final reaction may take place by placing Tollen's Reagent in a glass and then adding Glucose/Dextrose and shaking the bottle to carry out the reaction.
AgNO3 + KOH -> AgOH + KNO3 AgOH + 2NH3 -> [Ag(NH3)2]1+ + [OH]1- (Note: See Tollen's Reagent) [Ag(NH3)2]1+ + [OH]1- + Aldehyde(Usually Glucose/Dextrose) -> Ag + 2NH3 + H2O
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would like to what is necessitated to melt silver plate and silver items.? woundering if i could use a torch? would like to melt down galore silver plate spoons and so on items. but don't know what steps to take. i'm thinking that i would use torch, and just melt the silver off the items. is this true. or are there more steps to do this. any aid would be thinkfull. thanks. rob. (is there any sights that might tell me how to do this? I'd probably start out here...Good luck... http://www.kitco.com/jewelry/meltingpoints.html |
