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Is immersion gold the same as ENIG?

ENIG is one kind of surface treatment of PCB production .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.

Immersion nickel gold or electroless nickel gold,like 6 layer Rigid-flex Immersion Gold PCB, is to replace palladium on the surface of copper by chemical reaction, then electrolessly plate a layer of nickel-phosphorus alloy on the basis of palladium core, and then plate a layer of nickel on the surface of nickel through displacement reaction gold. The immersion gold of nickel gold has two processes: displacement and semi-replacement and semi-reduction mixed bath building.

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