Author: Robby
When dealing with different types of oil contamination, oil removal methods need to be targeted to ensure the best results. Oil stains can be mainly divided into saponified oils and non-saponified oils according to their nature. The former mainly includes animal oils and vegetable oils, their components such as fat can react with alkali to generate water-soluble substances; while the latter is derived from minerals, such as gasoline, motor oil, etc., they do not react with alkali.
In practice, parts may contain both types of oils. Unsaponifiable oils are more common in industrial and everyday applications. For these oils, there are a variety of effective oil removal methods:
1. organic solvent method: using solvents that can dissolve oil, such as gasoline, alcohol, etc., for soaking or scrubbing.
2. manual processing: for large-scale parts, manual degreasing is still a viable method, such as the use of cement paste wipe, both the use of its alkaline and play a mechanical role.
3. Chemical degreasing: The part is placed in a heated chemical degreasing solution, and the oil is removed by dipping or boiling. The higher the temperature, the better the results are usually.
4. mechanical auxiliary degreasing: in the tumbling machine or vibration sieve machine to add degreasing agent, the use of mechanical action to accelerate the process of degreasing, suitable for small pieces of degreasing. 5. oxidation: the use of concentrated sulfuric acid to remove the oil.
5. oxidation method: the use of concentrated sulfuric acid oxidizing properties to remove oil, while making the surface of the workpiece passivation, to prevent corrosion.
6. ultrasonic degreasing: the use of ultrasound in the solution produced by alternating decompression and pressurization, the formation of tiny bubbles and instantaneous rupture to produce impact, thereby removing oil.