Knowledge | 2022-05-31
Oil cleaning technology of metal parts surface-ultrasonic washing machine
Metal parts need surface treatment before assembly because some machine tool equipment aging causes the metal parts surface to produce oil stain and leave oil film, it affects the bonding force between the surface coating and the base metal, and has a great influence on the metal coating. Even a little oil pollution will cause the coating to bond unsolidly, and produce the phenomena of peeling and bubble, etc. . In addition, the oil will infect the electrolyte, affect the structure of the coating, metal products in the machining process, storage process or polishing process will inevitably oil pollution.
Metal parts surface in addition to the existence of natural film and general factory grease, the parts will also have heat treatment of rust-proof oil, lubricating oil, oxide scale, quenching oil, stamping lubricant, and other dirt, so the dirt to be removed before electroplating may be a complex mixture, long-term non-treatment will seriously affect the quality of electroplating. To ensure the quality of plating parts, so that the coating is firmly bonded, metal parts in electroplating before it is necessary to carry out oil cleaning. Many enterprises usually use industrial ultrasonic cleaning machines for oil degreasing, the effect is very good, saving time and labor.
Two types of oils adhere to metal surfaces: saponified fats, including vegetable and animal oils, which react with alkali to form water-soluble soaps; and unsaponified fats, mineral oils, for example, do not interact with alkali. Grease does not dissolve in water, but in organic solvents, so you can use solvent-based cleaning agents to clean parts. Oil cleaning should be based on the nature of the metal surface oil and the pollution degree to determine. The methods of oil removal include organic solvent oil removal, electrochemical oil removal, and chemical oil removal. The common solution is to use ultrasonic cleaning equipment with an oil removal agent, oil removal efficiency is higher.
Ultrasonic waves and sound waves are similar and are the propagation of mechanical vibration in the medium, but the frequency of the two is different. With the aid of ultrasonic cleaning equipment, the vibration can be generated by the action of ultrasonic waves. The liquid can be stretched and compressed by the vibration of the dense phase, and a hole can be formed in the "sparse" position, the "secret" location produces compression. Under the ultrasonic vibration, the cleaning fluid, the interior will be stretched and compressed frequently, which will cause the micro-bubble to produce and burst. When the micro-bubble bursts, the cleaning fluid will enter the center of the bubble and produce a water hammer at great speed. In the specific operation process, the naked eye can be directly observed the whole process, at this time, if the fingers are placed in the cleaning solution, will produce a sense of acupuncture. This is the phenomenon of ultrasonic cavitation. After a period of cleaning, the surface of the dirt will slowly fall off, to achieve clean purposes.
As common cleaning equipment in industrial cleaning, ultrasonic cleaning machine has helped many enterprises to solve complex cleaning problems and reduce the labor cost of enterprises and has become the first choice of cleaning equipment for many enterprises.