why the pcba board need to wash

During the processing of PCBA, solder paste and flux will produce residual substances. The residue contains organic acids and decomposable ions, of which organic acids have corrosive effects, and the residual ions on the pads can cause short circuits. Residues are dirty on the PCBA board and do not meet customer requirements for product cleanliness. At the same time, it will also affect the stability of the PCBA board. Therefore, it is very necessary to clean the PCBA board.