How to Remove PCB Soldering Flux?
All printed circuit boards, whether they’re going to be used in a calculator or in a supercomputer go through the step of component soldering. It is one of the integral steps in print board manufacturing. Residual soldering flux however is the problem that must be dealt by the manufacturers. Typically, ultrasonic cleaning is done as the final step for removing flux contamination. Flux residue cleaning must be done properly as flux residues need to be disposed in a safe manner.
Most solder flux cleaners are water based and biodegradable. Sometimes the fluxes used and solder pastes are not soluble in water, for such cases special solutions are used based on the type of flux.
Sumitron offers you some of the best solder flux cleaners, and solder flux removers. Two of the most commonly demanded concentrates by customers to remove water-soluble fluxes are the mildly alkaline ELMk.,;A Tec clean A1 and neutral ELMA Clean 260 d&s (used for fluxes that are not readily water soluble)
For commercial PCB manufacturers who have a lot to produce and too little time, it is best to go with ultrasonic cleaners for PCB fabrications. The process is rather straight forward; follow these steps for best results.
1.To prevent damage caused by harmonic waves, get an ultrasonic cleaner with a “sweep” function.
2.To make sure your cleaning is optimum and hassle free, you need to follow the instructions for correct dilution of the concentrate, the correct cleaning time and the correct cleaning temperature.
3.The right way to add cleaning agent concentrate is by adding the water first into cleaning container and then adding the concentrate.
4.After you have put in the required items into the mix, turn on the machine and start the degassing process to release the trapped air in the liquid and speed up the cleaning process.
5.While placing the PCB boards in the solution, you need to make sure that they are not touching each other.
6.Start the sweep function and at the end of the cycle remove and inspect.
After you are done with the process, you need to dispose of the cleaner and flux residues. While disposing off the cleaning solution is the easy part, flux disposal needs greater care. Flux residues are isolated from the cleaning bath and are disposed off.
Good ultrasonic cleaners have the feature of flux separation. Not only this, they also increase the life of the cleaning solution by removing contaminants from the solution so that it lasts longer.
Industrial ultrasonic cleaner have diverter valves that allow operators to direct floating contaminants to settle down to the bottom of the tank for filtration systems and return treated solution to the cleaning bath.
Typically, PCB cleaning time is increased as the solution loses its strength. To make sure your cleaning is up to the mark for all your PCBs, you need to keep replacing the solution frequently.