The quality of degreasing mainly depends on four factors: degreasing temperature, degreasing time, mechanical action and degreasing agent. 1. Degreasing temperature Generally speaking, the higher the temperature, the more thorough the degreasing. This is because of three reasons. First, temperature changes the physical properties of oil stains. For example, anti-rust grease with a high dropping point, Vaseline, solid paraffin, etc., even if high-concentration lye is used at lower temperatures, it is difficult to wash. However, when the temperature of oil stains is increased, their viscosity decreases, and even droplets are formed to facilitate removal. Second, it promotes the progress of chemical reactions. Generally speaking, every 10 degrees of temperature rise will double the speed of chemical reactions. The third is to accelerate the movement of surfactant molecules, thereby promoting the effects of infiltration, emulsification, and dispersion. As the temperature increases, the solution’s ability to dissolve dirt also increases. However, not all occasions are the higher the temperature, the better. Various degreasing agents have their suitable temperature range. The oil droplets adhere to the surface, causing the phosphating film to bloom unevenly. 2. Degreasing time In the degreasing operation, sufficient degreasing time must be ensured. Generally, the degreasing time of pressure jetting is 1.5~3 minutes, and that of immersion degreasing is 3~5 minutes (depending on the type and amount of oil stain). Increase the degreasing time, that is, prolong the contact time between the degreasing liquid and the oil, thereby improving the degreasing effect. The more oily soil, the longer the degreasing time will be. In the assembly line operation, it is often not allowed to take too long time, so it is generally degreased by spraying for 1 minute, and then degreased by immersion for 3 minutes. 3. Mechanical action In degreasing, it is very effective to use mechanical action such as pressure spraying or stirring, because the fresh degreasing solution is forced to have good contact with the surface of the part during spraying, and the content of the whole degreasing liquid is uniform, which is conducive to improving the degreasing effect; when spraying Relying on mechanical force to promote the degreasing agent to penetrate and destroy the oil film, thereby effectively forcing the oil stains to leave the surface of the parts; when spraying, the oil stains separated from the parts are emulsified and dispersed in the degreasing solution to prevent the oil stains from being adsorbed on the surface of the cleaned parts. In medium and low temperature degreasing, mechanical action is particularly important. Generally speaking, the speed of pressure spraying is more than 1 times faster than that of immersion degreasing. The injection pressure is usually (0.1~0.2) Mpa (the degreasing agent used for pressure injection must be low-foaming, so as not to affect the normal operation and the loss of degreasing liquid due to too much foam), dipping and degreasing cannot be considered as static dipping, and a circulating pump must be equipped , so that the solution is constantly stirred, and the circulation volume per hour is about 5 times the volume of the bath solution. 4. Effect of degreasing agent on degreasing effect The composition and application method of the degreasing agent have a great influence on the degreasing effect. For example, a lye containing a surfactant degreases better than a solution of lye alone. For solid or semi-solid grease with a high drop point, solvent cleaning is more effective than other degreasing effects. In order to improve the emulsification and dispersion ability of oil stains, it is effective to appropriately increase the content of surfactant in the degreasing agent. Different types of surfactants and different alkaline substances will cause certain differences in the degreasing effect. Good degreasing agents are all processed A large number of tests are carried out to determine the mutual matching ratio of its components through repeated screening. For lye degreasing agents containing surfactants, the most effective cleaning effect is at the upper limit of the critical micelle concentration of surfactants. During use, the degreasing agent will be continuously consumed to reduce the concentration. Therefore, the degreasing agent must be added regularly to maintain the necessary concentration. The degreasing effect of the degreasing agent is not in a straight-line relationship with the concentration. Therefore, in the case of high degreasing quality requirements, the method of greatly increasing the concentration should not be adopted, but the method of secondary degreasing should be used. The two degreasing solutions can be the same , and there is no need to increase the concentration additionally. In actual use, various factors must be considered, so that all factors are controlled in the best state, so that the degreasing can achieve satisfactory results.  

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