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. It consists of an electroless nickel plating, covered with a thin layer of gold, which protects the nickel from oxidation. The gold is typically applied by quick immersion in a solution containing gold salts. Some of the nickel is oxidized to Ni2+ 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 type is more common and significantly cheaper as less gold is needed to cover only the solder pads.
^Cite error: The named reference uyemu2019 was invoked but never defined (see the help page).
and 14 Related for: Electroless nickel immersion gold information
impact of pores present in the gold layer. Both the nickel and gold layers can be plated by electrolytic or electroless processes. There are many factors...
some important applications, such as the electrolessnickelimmersiongold (ENIG) process used to obtain gold-plated electrical contacts on printed circuit...
the bath ENIG (ElectrolessNickelImmersionGold): typically 100-200 microinches of nickel with 3-5 microinches of gold on top. Some gold dissolves into...
hundreds of nanometers. Electrolessnickelimmersiongold (ENIG) Hot air solder leveling (HASL) Immersion silver plating (IAg) Immersion tin plating (ISn) Reflow...
fields, which may short out components. IPC Standard: IPC-4553 Electrolessnickelimmersiongold (ENIG) Hot air solder leveling (HASL) Organic solderability...
during the process may introduce defects into PCB ElectrolessNickelImmersionGold (ENIG) Immersion Silver (IAg) Organic Solderability Preservative (OSP)...
is plating aluminum with zinc prior to electrolytic or electrolessnickel plating. Immersion zinc plating involves the displacement of zinc from zincate...
so is used in some medical applications. Copper-clad aluminium wire Electroless copper plating Electroplating "Copper Plating". Spectrum Metal Finishing...
shown that both noble metals such as gold, platinum, palladium, and silver, and base metals such as iron, nickel, copper, and aluminium can act as a catalyst...