What is the circuit board tri-proof paint rework? The coating of three-proof paint is generally the last process in PCB assembly. However, during inspection, electronic components may have defects. At this time, the three-proof paint coating is required to be repairable. So it is generally called circuit board tri-proof paint rework. How is it done?

For electronic components used in harsh environments, coating the three-proof paint can provide various protections for the circuit boards: moisture, mildew, dust, insulation, minimize the growth of dendrites, and release stress. The three-proof paint makes the electronic components more durable, improves the reliability of the electronic equipment, and reduces the warranty cost.

When the circuit board needs to be repaired, the expensive components on the circuit board can be taken out separately and the rest can be discarded. But the more common method is to remove the protective film on all or part of the circuit board, and replace the damaged components one by one. When removing the protective film of the three-proof paint, ensure that the substrate under the component, other electronic components, and the structure near the repair location will not be damaged. The protective film removal methods mainly include: using chemical solvents, micro-grinding, mechanical methods and desoldering through the protective film.

The use of chemical solvents is a commonly used method to remove the protective film of the three-proof paint. The key lies in the chemical properties of the protective film to be removed and the chemical properties of the specific solvent. Micro-grinding uses high-speed particles ejected from a nozzle to "grind" the protective film of the three-proof paint on the circuit board. The mechanical method is a particularly easy way to remove the protective film of the three-proof paint. Desoldering through the protective film is to first open a drain hole in the protective film to allow the molten solder to be discharged.

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