Through the research and practice of ultrasonic cleaning machine technology in phosphating treatment in recent years, good results have been achieved in improving the spraying quality of products and preventing the rusting of coated parts. Ultrasonic cleaning machines still have deficiencies in phosphating and coating treatment technology. This is because there is no formal technical process for the improvement of phosphating and coating treatment technology, making it difficult to develop.

        The pretreatment process for ultrasonic cleaning machines before coating is of great significance. Generally, the traditional process includes degreasing, water washing, hydrochloric acid rust removal, water washing, neutralization, water washing, surface adjustment, water washing, phosphating, water washing, and drying. The biggest drawback of this process is that it is very difficult to thoroughly rinse off the residual acid after acid washing and rust removal of structurally complex parts, especially after phosphating of welded assemblies, the residual liquid contained in the seams affects the processing of subsequent procedures. After the workpiece was sprayed, rust appeared along the gap in a short time, damaging the surface of the coating. It seriously affects the appearance and internal quality of the product. Such as motorcycle wheels, fuel tanks, frames, security doors, etc. During the processes of degreasing, rust removal, water washing, surface adjustment and phosphating, the liquid that seeps into the welding seam of the workpiece is difficult to be discharged, and water washing cannot completely remove it. Under wet and hot conditions, inclusions can easily cause the workpiece to turn yellow and the bearings of the cleaning machine to rust. If these residual liquids cannot be completely dried and solidified during the drying process, when the powder coating is subsequently dried at high temperatures, the residual liquids will seep out of the weld seam due to the effect of thermal expansion, affecting the adhesion between the coating and the metal surface, and causing the adhesion of the ultrasonic cleaning machine in the phosphating coating to decline or even fall off.