2023-01-05
Advantages and disadvantages of different surface treatment process of PCB board
There is a very common process used in the surface treatment of circuit boards, which is the immersion gold process. The immersion gold process has very obvious characteristics, so let's first analyze the characteristics of the surface treatment of immersion gold from the definition and practice of immersion gold.
1. The definition of immersion gold.
To put it simply, immersion gold is to use the method of chemical deposition to produce a layer of metal coating on the surface of the circuit board through chemical oxidation-reduction reaction.
2. The characteristics of immersion gold technology.
The copper on the circuit board is mainly copper, and the copper solder joints are easily oxidized in the air, which will cause poor conductivity, that is, poor tin intake or poor contact, and reduce the performance of the circuit board, so the surface treatment of the copper solder joints is required , immersion gold is to plate gold on it, gold can effectively block copper metal and air to prevent oxidation, so immersion gold is a treatment method for surface anti-oxidation, which is to cover a layer of gold on the surface of copper through chemical reaction, also called gold.
3. Advantages of immersion gold surface treatment.
The advantage of the immersion gold process is that the deposited color on the surface is very stable when the circuit is printed, the brightness is very good, the coating is very smooth, and the solderability is very good. Immersion gold generally has a thickness of 1-3 Uinch, so the surface treatment method of immersion gold is generally thicker, so the surface treatment method of immersion gold is widely used in key boards, gold finger boards and other circuit boards. Because gold has strong conductivity, good oxidation resistance and long service life.
4. Features of immersion gold board:
1) The immersion gold plate is bright in color, good in color and luster, and looks good.
2) The crystal structure formed by immersion gold is easier to weld than other surface treatments, and can have better performance and ensure quality.
3) Because the immersion gold board only has nickel gold on the pad, it will not affect the signal, because the signal transmission in the skin effect is on the copper layer.
4) The metal properties of gold are relatively stable, the crystal structure is denser, and the oxidation reaction is not easy to occur.
5) Since the immersion gold board only has nickel gold on the pad, the combination of the solder mask on the circuit and the copper layer is stronger, and it is not easy to cause a micro-short circuit.
6) The project will not affect the spacing when making compensation.
7) The stress of the immersion gold plate is easier to control.
5. The relationship between Shen Jin and Goldfinger
What is a connecting finger? To put it bluntly, it is a brass contact, which can also be said to be a conductor. In detail, because gold has strong oxidation resistance and strong conductivity, the parts connected to the memory slot on the memory stick are plated with gold, and all signals are transmitted through the gold fingers. Because the golden finger is composed of many yellow conductive contacts, its surface is gold-plated and the conductive contacts are arranged like fingers, hence the name. Generally speaking, the gold finger is the connection part between the memory stick and the memory slot, and all signals are transmitted through the gold finger. The gold finger is composed of many golden conductive contacts. The gold finger is actually covered with a layer of gold on the copper clad laminate through a special process.
Therefore, the simple distinction is that immersion gold is a surface treatment process for circuit boards, and gold fingers are wires.
1. The definition of immersion gold.
To put it simply, immersion gold is to use the method of chemical deposition to produce a layer of metal coating on the surface of the circuit board through chemical oxidation-reduction reaction.
2. The characteristics of immersion gold technology.
The copper on the circuit board is mainly copper, and the copper solder joints are easily oxidized in the air, which will cause poor conductivity, that is, poor tin intake or poor contact, and reduce the performance of the circuit board, so the surface treatment of the copper solder joints is required , immersion gold is to plate gold on it, gold can effectively block copper metal and air to prevent oxidation, so immersion gold is a treatment method for surface anti-oxidation, which is to cover a layer of gold on the surface of copper through chemical reaction, also called gold.
3. Advantages of immersion gold surface treatment.
The advantage of the immersion gold process is that the deposited color on the surface is very stable when the circuit is printed, the brightness is very good, the coating is very smooth, and the solderability is very good. Immersion gold generally has a thickness of 1-3 Uinch, so the surface treatment method of immersion gold is generally thicker, so the surface treatment method of immersion gold is widely used in key boards, gold finger boards and other circuit boards. Because gold has strong conductivity, good oxidation resistance and long service life.
4. Features of immersion gold board:
1) The immersion gold plate is bright in color, good in color and luster, and looks good.
2) The crystal structure formed by immersion gold is easier to weld than other surface treatments, and can have better performance and ensure quality.
3) Because the immersion gold board only has nickel gold on the pad, it will not affect the signal, because the signal transmission in the skin effect is on the copper layer.
4) The metal properties of gold are relatively stable, the crystal structure is denser, and the oxidation reaction is not easy to occur.
5) Since the immersion gold board only has nickel gold on the pad, the combination of the solder mask on the circuit and the copper layer is stronger, and it is not easy to cause a micro-short circuit.
6) The project will not affect the spacing when making compensation.
7) The stress of the immersion gold plate is easier to control.
5. The relationship between Shen Jin and Goldfinger
What is a connecting finger? To put it bluntly, it is a brass contact, which can also be said to be a conductor. In detail, because gold has strong oxidation resistance and strong conductivity, the parts connected to the memory slot on the memory stick are plated with gold, and all signals are transmitted through the gold fingers. Because the golden finger is composed of many yellow conductive contacts, its surface is gold-plated and the conductive contacts are arranged like fingers, hence the name. Generally speaking, the gold finger is the connection part between the memory stick and the memory slot, and all signals are transmitted through the gold finger. The gold finger is composed of many golden conductive contacts. The gold finger is actually covered with a layer of gold on the copper clad laminate through a special process.
Therefore, the simple distinction is that immersion gold is a surface treatment process for circuit boards, and gold fingers are wires.
