Why should the PCBA circuit board be painted with three anti-paints?
Single Side PCB manufacturer china
We all know that hundreds of pollutants that can be found on the PCBA board are very destructive. Just like moisture, it is a very common destructive factor for PCBA boards. Excessive moisture greatly reduces the insulation resistance between the conductors, accelerates high-speed decomposition, lowers the Q value, and corrodes the conductor. We often see that the metal part of the PCB circuit board is made of patina or is not coated with three anti-paint metal copper and steam, oxygen and its chemical reaction.
Other contaminants on the PCBA board will also cause the same result as moisture erosion - electron decay, corrosion of the conductor and even irreparable short circuits. The most common contaminants found in electrical systems may be chemicals left in the process. Examples of such contaminants include fluxing agents, solvent release agents, metal particles, and marking inks. There are also major pollution groups that are caused by accidental handling, such as body oils, fingerprints, cosmetics and food debris. There are also many contaminants in the operating environment, such as salt sprays, sand, fuel, acids, and other corrosive vapors and molds. (Flexible PCB manufacturer china )
If three anti-paints are applied to printed circuit boards and components, electronic operating performance degradation can be reduced or eliminated when it is likely to be adversely affected by the operating environment. Even if the coating is very thin, it can withstand mechanical vibration and vibration, thermal shock, and operation at high temperatures to a certain extent. Of course, the concept that the film can be used to impart mechanical strength or sufficient insulation to the individual parts inserted into the printed circuit board is a mistake. Components must be mechanically inserted and must have their own caulking agent, so that there is a double insurance to prevent accidents.