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Why should PCBA process be painted conformal coating?

Conformal coating is a specially formulated coating used to protect circuit boards and their associated equipment from the environment attack, thereby increasing and extending their useful life, ensuring safety and reliability.

Under realistic conditions, such as chemical, vibration, high dust, salt spray, humidity and high temperature, PCB circuit boards may cause corrosion, softening, deformation, mildew and other problems, resulting in circuit board circuit failure. Conformal coating is applied to the surface of the circuit board, it forms a transparent protective film (moisture proof, salt spray prevention, mildew proof) after curing.

Conformal coating has good resistance to high and low temperature, and has superior properties of insulation, moisture, leakage, shock, dust, corrosion, aging and corona resistance. It can enhance the moisture and anti-fouling ability of electronic circuits and components and prevent the solder joints and conductors from being eroded. It can also shield and eliminate electromagnetic interference and prevent short circuit, and improve the insulation performance of the circuit board.

In addition, the conformal coating also contributes to the abrasion and solvent resistance of the wiring and components, and releases the pressure caused by periodic changes in temperature. Withstand mechanical vibration, thermal shock, and operation at high temperatures. It also reduces the degradation of electronic operating performance to a minimum, and the most important one is to prevent leakage, allowing for higher power and closer board spacing.

In summary, it is why the PCBA processing should be painted with conformal coating, and the conformal coating technology of PCBA has become a highly concerned process technology in the field of electronic assembly.