Introduction to the Conformal Coating Process for PCBA Manufacturing

With the development of electronic technology, PCBA is highly integrated, and there are more and more components on PCBA, smaller and smaller, and higher density. The height between devices (the distance between the device and the PCBA) is getting smaller and smaller, but environmental factors have an increasing impact on the PCBA, which puts forward higher requirements for the reliability of the PCBA of electronic products.

At this time, you need to use conformal coating processing technology to protect the PCBA. Conformal coating is a layer of material applied to PCBA to enhance the efficiency and reliability of PCB assembly, protect PCBA from environmental hazards, extend the service life of the product, and improve the insulation properties and mechanical strength of the product.

The conformal coating processed by conformal coating spraying is a specially formulated coating used to protect PCB and related equipment from environmental erosion. Mainly used for integrated circuit protection of common household appliances and electronic products such as color TVs, freezers, washing machines, and air conditioners. It has the functions of waterproof, lightning protection and anti-corrosion. In addition, conformal coating can improve and extend the service life of household appliances and other equipment, ensuring safe and reliable use. The conformal coating should cover the entire PCB except key components, isolating sensitive electronic components from harsh environments to protect the circuit board from moisture, salt spray, mildew and other factors. , to avoid damage caused by friction or physical impact.

Requirements for processing technology of conformal coating

1. The conformal coating should be bright, smooth and uniform in thickness, and the surface of the solder pads, SMD or conductors should be well protected.

2. The coated PCB should be clean, tidy and free of component damage.

3. The surface of PCB should be free of bubbles, orange peel, paint, pinholes, water ripples, chalking and flaking.

Which parts of PCBA cannot be coated with conformal coating?

1. High-power tapes, power resistors, power dipoles, and cement resistors with radiating surface or radiator components.

2. dip switch, adjustable resistor, buzzer, battery seat, fuse seat ( tube ), IC seat and touch switch.

3. Plug-in or paste LED, digital tube.

4. The screw holes of the PCBA board cannot be painted with conformal coating.

5. All types of sockets, pins, terminals and DB headers.

6. Other parts and devices specified in the designs that cannot be used with insulating paint.

Advantages of conformal coating processing

1. The spray paint dosage, spray paint position and area are set accuracy.

2. No need to wipe the board after painting. If the distance between some parts and the edge of the circuit board is large, it is possible to paint directly without using the fixture, which can save labor costs.

3. No gas volatilization, to ensure a clean working environment.

4. All the substrates do not need to be covered by fixtures to eliminate the possibility of collision.

Since the conformal coating can greatly improve the service life, stability and environmental adaptability of PCBs in products, it is increasingly adopted by more and more customers.

We provide advanced conformal coating processing with stable quality. Visit more details at our website: ucpcba.com