The circuit board factory explained: What is sinking gold? Why should we sink gold?

PCB manufacturers, PCB designers and PCBA manufacturers explain to you what PCB manufacturers say: What is sinking gold? Why should we sink gold?

01 What is sinking gold?

In short, gold deposition is to produce a layer of metal coating on the surface of PCB by chEMIcal oxidation and reduction reaction.

02 

Why should we sink gold?

Copper on the circuit board is mainly red copper, and copper solder joints are easy to be oxidized in the air, whICh will cause poor conductivity, that is, poor tin eating or poor contact, reducing the performance of the circuit board.

Then it is necessary to carry out surface treatment on copper solder joints. Gold deposition is to gild the copper. Gold can effectively block copper metal and air to prevent oxidation. Therefore, gold deposition is a treatment method for surface oxidation prevention, which is to cover the copper surface with a layer of gold through chemical reaction, also known as chemical gold.

03 What are the advantages of this surface treatment of gold deposition?

The advantage of the gold deposition process is that the color of the deposit on the surface of the printed circuit is very stable, the brightness is very good, the coating is very flat, and the solderability is very good.

Generally, the thickness of gold is 1-3 Uinch. Therefore, the thickness of gold produced by the surface treatment method of gold deposition is generally relatively thick. Therefore, the surface treatment method of gold deposition is generally applied to key boards, gold finger boards and other circuit boards because of its strong conductivity, good oxidation resistance and long service life.

04 What are the advantages of circuit boards with gold plated boards?

The main points are as follows:

1. The gilt plate is bright in color, good in color and good in appearance.

   
   

2. The crystal structure formed by gold precipitation is easier to weld than other surface treatments, which can have better performance and ensure quality.

3. As the gold plate only has nickel gold on the pad, it will not affect the signal, because the signal transmission in skin effect is in the copper layer.

4. The metal property of gold is relatively stable, the crystal structure is more compact, and the oxidation reaction is not easy to occur.

5. Since only the bonding pad of the gold plated plate has nickel gold, the bonding between the resistance solder and the copper layer on the circuit is stronger, and it is not easy to cause micro short circuit.

6. The project will not affect the spacing when making compensation.

7. The stress of the gold plate is easier to control.

05 Shen Jin and Jin Zhi

The golden finger is a brass contact, or a conductor.

To be specific, because gold has strong oxidation resistance and high conductivity, the components connected to the memory module and the memory socket are plated with gold, and all signals are transmitted through the gold finger.

Because the golden finger is composed of many yellow conductive contacts, its surface is gold-plated and the conductive contacts are arranged like fingers, so it is named.

Generally speaking, the golden finger is the connecting part between the memory module and the memory slot. All signals are transmitted through the golden finger. The golden finger is composed of many golden conductive contacts. In fact, the golden finger is coated with a layer of gold on the copper clad plate through a special process.

Therefore, the SIMple distinction is that gold deposition is a surface treatment process of PCB, and gold finger is a component with signal connection and conduction on PCB.

PCB manufacturers, PCB designers and PCBA manufacturers explain to you what PCB manufacturers say: What is sinking gold? Why should we sink gold?