Why does PCB need to use three – proof paint?
Anti-corrosion paint, also called electronic circuit board PCB applying, only the oil, moisture-proof paint, anti-corrosion coatings, waterproof glue, insulating paint, anti-corrosion paint, paint, dust, paint, salt mist protection paint anti-corrosion, only the paint, glue, etc., used anti-corrosion paint PCB circuit board with waterproof, moisture-proof, dustproof “three anti” performance and resistance to cold and hot shock, resistance to aging, ozone radiation resistant, salt fog resistance, resistance to corrosion, good vibration resistance, flexibility, adhesion and other performance.
Moisture is the most common and destructive factor on PCB boards. Excessive moisture can greatly reduce the insulation resistance between conductors, accelerate high-speed decomposition, reduce Q value, and corrode conductors. We often see the PCB metal part of the copper is not coated with three paint copper and water vapor, oxygen caused by its chemical reaction.
Hundreds of contaminants found on printed circuit boards can be just as damaging. They can cause the same results as moisture erosion – electron decay, corroding conductors and even irreversible short circuits. The most common contaminants found in electrical systems may be chemical residues from the process. These contaminants include flux, solvent release agents, metal particles and marking inks. There are also major contamination groups, such as human body oils, fingerprints, cosmetics and food residues, which are accidentally caused by human hands. There are also many contaminants in the operating environment, such as salt spray, sand, fuels, acids, and other corrosive vapors and mold.
To reduce or eliminate the deterioration of electronic performance by coating printed circuit boards and components with tri-barrier paint when they may be affected by adverse operating conditions. If the coating is maintained for a satisfactory period of time, such as longer than the life of the product, the purpose of the coating is deemed to have been achieved.
Even though the coating is very thin, it can withstand mechanical vibration and oscillation, thermal shock and operation at high temperature to a certain extent. Of course, the notion that a film can be used to make individual parts of a printed circuit board mechanically strong or sufficiently insulating is wrong. Components must be mechanically fastened and have their own suitable caulking agent to provide double protection against accidents.