source:Industry News release time:2022-04-11 Article author:sznbone Popular:pcb
PCB hard gold: Hard Gold; soft gold soft Gold
Electroplating soft gold is to precipitate nickel and gold on the circuit board by electroplating, and its thickness control is more flexible. Generally, it is used for making aluminum wires on COB (Chip On Board), or the contact surface of mobile phone buttons, and most of the electroplating gold used for gold fingers or other adapter cards and memory is hard gold, because it must be wear-resistant.
To understand the origin of hard gold and soft gold, it is best to first understand the process of electroplating gold. Leaving aside the previous pickling process, the purpose of electroplating is basically to electroplate "gold" on the copper skin of the circuit board, but if "gold" and "copper" are in direct contact, there will be a physical reaction of electron migration and diffusion (potential potential). Therefore, we must first electroplate a layer of "nickel" as a barrier layer, and then electroplate gold on top of nickel. Therefore, what we generally call gold electroplating should be called "electroplating nickel gold".
The difference between hard gold and soft gold is the composition of the gold that is finally plated. When gold plating, you can choose to electroplate pure gold or alloy. Because the hardness of pure gold is relatively soft, it is also called "soft gold". ". Because "gold" can form a good alloy with "aluminum", COB will specially require the thickness of this layer of pure gold when making aluminum wires.
In addition, if you choose to electroplate gold-nickel alloy or gold-cobalt alloy, because the alloy will be harder than pure gold, it is also called "hard gold".
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