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On the computer's memory bar and graphics card, we can see a row of golden conductive contacts, which are called "gold fingers". The Gold Finger (or Edge Connector) in the PCB design and production industry uses the connector connector as an outlet for the board to connect to the external network. Next, let's understand the processing method of the gold finger in the PCB and some details. Gold finger PCB surface treatment 1. Nickel electroplating: thickness up to 3-50u", because of its superior conductivity, oxidation resistance and wear resistance, it is widely used in gold finger PCBs that require frequent insertion or removal or PCBs that require frequent mechanical friction Above, but because the cost of gold plating is extremely high, it is only used for local gold plating such as gold fingers. 2. Immersion gold: conventional thickness 1u", up to 3u" due to its superior conductivity, flatness and solderability, it is widely used in high-preci...

Hard Gold PCB Hard Gold PCB High Tg PCB HIGH TG PCBVia in Pad VIA IN PAD Hard gold plating pcb , immersion gold PCB, is to immerse the board in the plating tank and apply current to form a nickel-gold coating on the copper foil surface of the board. The electro-nickel gold is characterized by high hardness, wear resistance and oxidation resistance. Widely used in applications. Introduction to Hard Gold PCB Technology: 1. Purpose and role: gold as a precious metal, has good weldability, oxidation resistance, corrosion resistance, small contact resistance, good wear resistance of the alloy and so on; 2. At present, the electroplating gold of the circuit board is mainly a citrate gold bath, which is widely used for its simple maintenance and simple and convenient operation; 3. Water gold content is controlled at about 1 gram / liter, PH value of about 4.5, temperature of 35 degrees, specific gravity of about 14 waves, current density of about 1ASD; 4. The main added drugs are acid-adjuste...