How to remove PCB welded residues
The welded residue on the PCB is mainly salt substances that are not completely volatile or reaction to the solder reactions during the welding process. These residues may have adverse effects on the performance and service life of PCB , so they need to be removed in time. Common welded residues include residues of rosin welds and residues of organic acid welds. The residue of the rosin welded is mainly composed of polymer pine fragrance, undesirable activation agent, and salt generated between the rosin and melting welded welded during welding. These substances swell after the moisture absorption, and some substances also respond to water with water. The residues of organic acid welds are mainly composed of a variety of organic acids, and also contain some compounds that can produce halogen ions at high temperatures. This type of residue is the most difficult to remove salt formed by organic acids and solder formation. They have strong adsorption properties and poor solubility. In or