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What is the role of flux in PCB circuit board soldering?
We often use flux in the soldering process of PCB circuit boards. So, what is the role of flux in the soldering process?
1. Remove oxides or other contaminants on the surface of the PCB circuit board. For example, the rosin acid in the flux can undergo a reduction reaction with the oxide film on the surface of the metal to be welded; the activator in the flux reacts with the copper oxide and finally replaces pure copper; the metal salt in the flux reacts with the oxide on the surface of the metal to be welded; the organic halide in the flux can also react with the surface of the metal to be welded to remove the oxide.
2. Prevent re-oxidation of solder and soldering surface during PCB circuit board soldering. During soldering, the flux covers the surface of the metal to be soldered and the solder to isolate the metal to be soldered and the surface of the solder from the air, which can effectively prevent the metal surface from re-oxidizing at high temperature.
3. Reduce the molten solder's surface tension and promote the solder's expansion and flow. When the flux removes the oxides on the soldering surface, a specific chemical reaction occurs, which can reduce the surface tension and viscosity of the molten solder, and at the same time, increase the surface activity, thereby improving the wettability of the solder.
4. It is conducive to heat transfer to the welding area. Flux reduces the surface tension and viscosity of molten solder, increases the fluidity of liquid solder, and facilitates rapid and efficient heat transfer to the soldered area.
There are many types of fluxes on the market; how to choose? What are their advantages?
1. Flux rosin; high purity, no impurities, anti-oxidation, no cleaning, high activity. The tin-plated components can be welded directly with rosin core solder if the circuit board is scratched. The flux is widely used in motherboard maintenance, circuit welding, home appliance maintenance, etc.
2. Hash board chip flux paste; the product has good fluidity, lead-free environmental protection, high welding qualification rate and can be widely used to weld various PCB boards and BGA solder balls.
3. Flux solder paste; the product has low smoke, high speed, and high efficiency, and the solid is not easy to tilt. It is suitable for sensors, motors, electronic components, BGA chip value balls, etc.
The above is the role of the flux in the PCB circuit board and the advantages of various fluxes, and I hope to help you with the choice of flux!
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