The difference between immersion gold and gold plating on pcb board

What is immersion gold: A layer of coating is formed by chemical oxidation-reduction reaction, which is generally thicker. It is a kind of chemical nickel-gold-gold layer deposition method, which can achieve a thicker gold layer. It is usually called immersion gold.

The difference between immersion gold board and gold-plated board of pcb board:

1. The crystal structure formed by immersion gold and gold plating is different. The thickness of immersion gold is much thicker than that of gold plating. Immersion gold will be golden yellow and yellower than gold plating, and customers are more satisfied.

2. The crystal structure formed by immersion gold and gold plating is different. Immersion gold is easier to weld than gold plating, and will not cause poor welding and cause customer complaints. The stress of the immersion gold plate is easier to control, and for products with bonding, it is more conducive to bonding processing. At the same time, because immersion gold is softer than gold plating, the immersion gold plate is not wear-resistant as a gold finger.

3. The immersion gold board only has nickel gold on the pad, and the signal transmission in the skin effect is on the copper layer and will not affect the signal.

4. The crystal structure of immersion gold is denser than that of gold plating, and it is not easy to produce oxidation.

5. As the wiring becomes denser, the line width and spacing have reached 3-4MIL. Gold plating is prone to short circuit of gold wire. The immersion gold board only has nickel gold on the pad, so it will not cause a short circuit of the gold wire.

6. The immersion gold board only has nickel gold on the pad, so the combination of the solder mask on the circuit and the copper layer is stronger. The project will not affect the spacing when making compensation.

7. It is generally used for boards with relatively high requirements, and the flatness is better. Generally, immersion gold is used, and immersion gold generally does not appear black pads after assembly. The flatness and standby life of the immersion gold board are as good as the gold-plated board.