Cleaning of printed circuit board before conformal coating application helps but may not be essential.
However, the cleanliness of the circuit can be crucial for both the short-term production process and the long-term reliability of the circuit.
Why clean a circuit board before conformal Coating application?
The cleaning of the circuit is normally done for two main reasons before conformal coating application:
The cleaning removes contaminants from the surface of the board before coating application. This may be important due to removal of potentially harmful residues that may affect the long-term reliability of the circuit. Defects like corrosion can be devastating to a circuit performance in the field.
Process Improvement. Cleaning can help the conformal coating application. It can avoid conformal coating defects like de-wetting and delamination. It can also help the adhesion of the coating to the circuit board. This surface preparation can be important, especially where coatings may have compatibility issues with the circuit board.
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