How to clean pcb with ultrasonic cleaning machine?

Compared with other cleaning methods, ultrasonic PCB cleaning machine shows great advantages. Especially in specialized and collectivized production enterprises, ultrasonic cleaning machines have gradually replaced the traditional process methods such as soaking, brushing, pressure cleaning, vibration cleaning and steam cleaning.

The high efficiency and high cleanliness of ultrasonic cleaning machine benefit from the penetration and cavitation shock wave generated by its sound wave when it propagates in the medium. Therefore, it is easy to clean the parts with complex shapes, holes and gaps. For general degreasing, rust prevention, phosphating and other processes, it only takes two or three minutes under the action of ultrasonic waves, which can increase the speed by several times to dozens of times compared with traditional methods, and the cleanliness can also reach a high standard. It can be seen that in many occasions that require high surface quality and productivity of products, other treatment methods are difficult to achieve or irreplaceable.

Generally, hydrogen peroxide is used to wash such products, because it volatilizes quickly and can quickly oxidize the residues. It is not easy to damage the circuit board. Especially, if the high-density PCB and ic pins are not cleaned or ultrasonic cleaning is not used, dust will be adsorbed between the high-density wires and IC pins. Once the environmental humidity is high, high-density short circuit will easily occur between the line and the pin, and once the environment is dry, the short circuit fault will disappear automatically and it is not easy to be found. Therefore, electronic machinery factories all over the world insist on ultrasonic cleaning of PCB.

In a word, improper cleaning of flux will cause serious performance degradation, especially in high-precision DC circuits. For all manually assembled or modified PCBs, make sure to use ultrasonic bath (or similar method) to complete the final cleaning. After air-drying by air compressor, the assembled and cleaned PCB can be baked at a slightly higher temperature to remove any residual moisture. We usually bake at 70-80 degrees Celsius for 10 to 15 minutes.