The reason why PCBA cleaning is becoming more and more important is that PCBA processing pollutants are very harmful to the circuit board. As we all know, in the process of processing will produce some ionic or non-ionic pollution, usually called some visible or invisible dust, when exposed to wet environment or electric field, will cause chemical corrosion or electrochemical corrosion, leakage current or ion migration, affect the performance and service life of the product. Today, let's analyze in detail what PCBA processing pollution has.

Contaminants are defined as any surface deposits, impurities, inclusions, and adsorbents that reduce the chemical, physical, or electrical properties of PCBA to unacceptable levels. There are mainly the following aspects:

1, PCBA components, PCB itself pollution or oxidation will bring PCBA surface pollution;

2, PCBA in the production and manufacturing process, need to use solder paste, solder, solder wire, etc., for welding, the flux in the welding process will produce residues in the PCBA surface pollution, is the main pollutant;

3, manual welding process will produce hand marks, wave welding welding process will produce some wave welding paw footprints and welding tray (jig) marks, the PCBA surface may also have different degrees of other types of pollutants, such as plugging glue, high temperature adhesive tape residue, handwriting and flying dust;

4, dust, water and solvent vapor, smoke, small particles of organic matter, and electrostatic charged particles attached to PCBA pollution.

The above shows that the pollutants mainly come from the assembly process, especially the welding process.

The above mentioned PCBA processing pollutants mainly come from SMT SMT process, especially welding process. Therefore, the staff is required to have very professional operation techniques and skilled operation skills, otherwise the production of PCBA board will become particularly difficult.