Search results
Results from the WOW.Com Content Network
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] ENIG can be applied before or after the solder mask, also known as "overall" or "selective chemical Ni/Au," respectively. The latter ...
Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more
Electroless nickel plating, covered by a thin layer of gold, is used in the manufacture of printed circuit boards (PCBs), to avoid oxidation and improving the solderability of copper contacts and plated through holes and vias. The gold is typically applied by quick immersion in a solution containing gold salts.
Nickel electroforming has nickel plating applied for fabrication of nickel products. For example, nickel can be deposited onto a mandrel and then lifted off the latter, creating a nickel-only part. [8] Nickel is also used as an undercoat for chrome or gold plating, as it improves adhesion and the longevity of the final layer.
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.
The number of times a connector can connect and disconnect with its counterpart while meeting all its specifications is termed as mating cycles and is an indirect measure of connector lifespan. The material used for connector contact, plating type and thickness is a major factor that determines the mating cycles. [35]
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 ...
The plastic connector housing is most often white, as shown (TE Connectivity / AMP 171822-4), but black is also common. Other colours are rarer. The part numbers used for the female contact pins depends on the detailed design, the surface coating (for example tinned or gold plated) and the form of supply.