The treatment process before coating of ultrasonic cleaning machine is very important. Generally conservative processes include degreasing, water washing, hydrochloric acid derusting, water washing, neutralization, water washing, surface conditioning, water washing, phosphating, water washing and drying. The disadvantage of this process is that it is difficult to remove the residual acid after pickling and derusting of parts with complex structure, especially after phosphating of welding assembly, the residual liquid in the gap affects the processing of the next process. After spraying, the workpiece will rust along the crack in a short time, and the coating surface will be damaged. Seriously affect the appearance and internal quality of products. Such as motorcycle wheel, fuel tank, frame, anti-theft door, etc
Through the research and practice of ultrasonic cleaner technology in phosphating treatment in recent years, good results have been achieved in improving product spraying quality and preventing coating parts from rusting
During degreasing, derusting, water washing, surface adjustment, phosphating and other processes of the workpiece, the liquid penetrating into the weld is difficult to discharge, and the water washing can not completely remove the inclusions, which is easy to cause the workpiece to turn yellow and rust under hot and humid conditions. If the residual liquid cannot be completely dried during the drying process, when spraying and drying powder at high temperature, the residual liquid will seep out from the weld due to the influence of thermal expansion, affecting the combination between the coating and the metal surface, resulting in reduced adhesion or even falling off of the coating.
Process parameters of ultrasonic cleaning machine
Ultrasonic cleaning temperature is an important factor affecting the cleaning speed. Properly increasing the cleaning temperature can improve the cavitation capacity and shorten the cleaning time, but after exceeding a certain temperature, the cavitation effect will be reduced due to the increase of steam pressure, so a certain temperature must be maintained. The test shows that the water-soluble medium is generally 50 ℃ ± 5.