Knowledge | 2022-09-13
Oil removal cleaning technology on the surface of metal parts-ultrasonic cleaning machine
Metal parts need to be surface treated before production and assembly. Because some machine tools and equipment aging causes the surface of metal parts to produce oil stains and leave oil film, the adhesion between the coating and the base metal is affected greatly, even a small amount of oil pollution will lead to poor adhesion of the coating, resulting in peeling, bubbles and other phenomena. Moreover, the oil will infect the electrolyte, and affect the structure of the coating, metal products in the machining process, storage process, or polishing process will inevitably be contaminated with oil.
In addition to the presence of the natural film on the surface of metal parts and general factory oil, parts will also have heat treatment of rust-proof oil, oil, oxide skin, quenching oil, stamping lubricant, and other dirt, so before electroplating to remove the dirt may be a complex mixture, a long time not to deal with it will seriously affect the quality of electroplating. To ensure the plating quality of parts, so that the coating is firmly combined, metal parts are in electroplating before it is necessary to carry out cleaning. Many enterprises usually use industrial ultrasonic cleaning machines for oil degreasing, the effect is very good, time-saving, and labor-saving.
Two general types of oils attach to metal surfaces: saponified oils, including vegetable and animal oils, which react with alkalis to form water-soluble soaps, and non-saponified oils, such as mineral oils, which do not react with alkalis. Oil does not dissolve in water, but will dissolve in organic solvents, so you can use a solvent-based cleaning agent on the parts to clean. Oil cleaning should be based on the nature of the metal surface oil and pollution to determine the extent. The methods include organic solvent deoiling, electrochemical deoiling, and chemical deoiling. The common solution is to use ultrasonic cleaning equipment with a deoiling agent, deoiling efficiency is higher.
Ultrasonic waves and sound waves are similar and are mechanical vibrations in the media transmission, but the two, are the frequency difference. With the use of ultrasonic cleaning equipment, you can use the role of ultrasound, and vibration, through this kind of density of vibration, to stretch, and compression the liquid, in the sparse position, the formation of holes, and dense locations generate compression. Under the vibration of ultrasonic waves, the cleaning fluid, the inside will be stretched and compressed frequently, causing micro-bubbles to produce and break, when breaking, the surrounding cleaning, the cleaning fluid will enter the center of the bubble and produce water hammer with great speed. In the specific process of operation, the naked eye can be directly observed the whole process, at this point, if the finger is placed in the cleaning solution, will produce a feeling of acupuncture. This is the phenomenon of ultrasonic cavitation. After a period of cleaning, the appearance of the dirt will slowly fall off, to achieve the goal of cleaning.
As common cleaning equipment in industrial cleaning, ultrasonic cleaning machine helps many enterprises to solve complex cleaning problems, and reduce the cost of labor, has become the preferred cleaning equipment for many enterprises.