After the welding process in PCBA processing, it is usually necessary to perform plate cleaning treatment, as there may be residues such as solder paste, flux, fingerprints, or ink during the welding process. If plate cleaning treatment is not carried out, not only will it look dirty and unattractive, but the long-term presence of residues will have serious corrosion on the circuit board, causing circuit short circuits and product failure. Therefore, In order to ensure the cleanliness and quality of the product, it is very important to clean the circuit board.
Circuit board cleaning agents, also known as board washing water, are commonly used to clean circuit boards. Generally, there are three types of board washing water: water-based board washing water, hydrocarbon board washing water, and chlorinated board washing water. There are many circuit board processing processes, and almost every process will cause some pollution to the circuit board or components. The role of the board washing process is to clean these pollutants and residues, The main sources of these pollutants come from the welding process. One is the tin slag generated by the solder paste during the welding process, and the other is the flux residue generated by the use of flux. Therefore, when welding, we should pay attention to the amount of solder paste and the selection of flux. The use of an appropriate amount of solder paste and the selection of appropriate flux can reduce the generation of residue;
There are two main methods of washing boards: manual and machine washing. Manual cleaning involves dipping the circuit board that needs to be cleaned with cleaning solvent, waiting for the residue to dissolve for a moment, and then brushing it off with a brush. Machine washing usually involves ultrasonic cleaning. Place the PCB board in the washing machine and confirm the cleaning time and ultrasonic frequency; Generally speaking, the plate washing process is an indispensable process in PCBA processing, but if the soldering flux used in the welding process is non washing flux, there is no need to carry out the plate washing process.
