Why do PCBA circuit boards need Tri-proof paint coating?

Why do PCBA circuit boards need Tri-proof paint coating?

Moisture is the most common and destructive main factor for PCBA circuit boards.Excessive moisture will greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, reduce the Q value, and corrode the conductors. We often see the patina on the metal part of the PCBA circuit board, which is caused by the chemical reaction of the metal copper that is not coated with the three-proof paint, water vapor and oxygen.

Hundreds of pollutants randomly found on PCBA circuit boards are equally destructive. They can cause the same result as moisture erosion—electron decay, corrosion of conductors and even irreparable short circuits. The most common pollutants found in electrical systems may be chemicals left over from the manufacturing process. For Examples, these pollutants include fluxes, solvent release agents, metal particles and marking inks. There are also major pollution groups that are caused by humans carelessly, such as body oils, fingerprints, cosmetics and food residues. There are also many pollutants in the operating environment, such as salt spray, sand, fuel, acid, and other corrosive vapors and molds.

Coating the three-proof paint on the PCBA circuit boards and components can reduce or eliminate the decline of electronic operation performance when it may be affected by adverse factors in the operating environment. If the coating paint can maintain its effect for a satisfactory period of time, such as longer the product’s life time, it can be deemed to have achieved its coating purpose.

The functions of Tri-proof paint coating and the applications will be updated next week.

Post time: Feb-01-2021