Is goldfinger’s “gold” gold?
First, let’s look at two concepts: soft gold and hard gold. Soft gold, usually soft gold. Hard gold, generally a compound of hard gold.
The main function of the gold finger is to connect, so it must have a good electrical conductivity, wear resistance, oxidation resistance, corrosion resistance.
Because pure gold (gold) texture is relatively soft, so gold fingers generally do not use gold, but just on the top of a layer of “hard gold (gold compounds)”, which can not only get good conductivity of gold, but also can make it wear resistance, oxidation resistance.
gold finger pcb
So has PCB ever used “soft gold”?
The answer, of course, is to use, such as some mobile phone button contact surface, COB (Chip On Board) above the aluminum wire, and so On. The use of soft gold is generally electroplating precipitated nickel gold on the circuit board, its thickness control is more elastic.
PCB board no matter plating soft gold or hard gold, the amount will not be too much, you can not be “gold” and to remove electronic equipment to oh!
gold plating pcb boards
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