The reason why PCB assembly cleaning becomes more and more important is that PCB assembly processing pollutants do great harm to circuit boards. We all know that some ionic or non-ionic pollution will be produced in the processing process, which is usually called some visible or invisible dust. When exposed to a humid environment or electric field, it will cause chemical corrosion or electrochemical corrosion, generate leakage current or ion migration, and affect the performance and service life of products. Today, let’s analyze in detail the pollution of PCB assembly processing.
Pollutants are defined as any surface deposits, impurities, slag inclusions and adsorbates that reduce the chemical, physical or electrical properties of PCB assembly to unqualified levels. It mainly includes the following aspects:
1. PCB assembly surface pollution will be caused by the pollution or oxidation of components and parts constituting PCB assembly and PCB itself;
2. During the manufacturing PCB assembly, solder paste, solder wire, etc. need to be used for welding, and the flux in the welding process will produce residues on the surface of PCB assembly to form pollution, which is the main pollutant;
3. Manual soldering will be produced fingerprints, and wave soldering will be produced some Wave soldering trace and Welding tray (fixture) trace. There may be other types of contaminants on the PCB assembly surface in varying degrees, such as plugging glue, high temperature tape residue glue, fingerprints and dust;
4. Electrostatic pollution caused by dust, water and solvent smoke, steam, particulate organic matter and charged particles attached to PCB assembly in the workplace.
The above shows that the pollutants mainly come from the assembly process, especially the welding process. Therefore, the staff are required to have very professional operation methods and skilled operation skills, otherwise the production of PCB assembly board will become particularly difficult.
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Post time: Nov-03-2022