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Common questions for oil removal process

Views: 0     Author: Site Editor     Publish Time: 2025-01-17      Origin: Site

In metal processing, machinery manufacturing and many industrial fields, oil removal process is an indispensable link. It aims to remove the oil, oil pollution and other pollutants on the surface of the workpiece, and to provide a clean surface for the subsequent coating, electroplating, welding and other processes. However, in the actual operation process, many non-professionals often have many questions about the oil removal process. This paper will list some common questions, and provide detailed answers, and combined with the actual cases, to show the effect and advantages of the oil removal process.

·Question 1: why need oil removal?

·Answer: Oil and oil pollution are the common pollutants in the processing, storage and transportation process of workpieces. These pollutants not only affect the beauty of the workpiece, but more importantly, they will seriously interfere with the subsequent coating, electroplating and other processes. The oil and oil will form an isolation layer, which hinders the good combination of the coating or coating with the surface of the workpiece, leading to problems such as coating peeling and uneven coating. Therefore, performing the oil removal treatment is a key step to ensure the quality of the subsequent process.

·Actual case: in an auto parts factory, the parts will be processed with a lot of oil and cutting oil. If no oil removal treatment, directly coating, the coating will soon appear spoff phenomenon. By adopting the appropriate oil removal process, the surface becomes clean and oil-free, the adhesion of the coating is significantly improved, and the product quality is guaranteed.

·Question two: what are the methods of oil removal process?

·Answer: There are various methods of oil removal process, mainly including organic solvent oil removal, alkaline oil removal, electrochemical oil removal and ultrasonic oil removal.

·Organic solvent oil removal: the organic solvent is used to remove the dissolution of oil. This method of oil removal speed, but the cost is high, and organic solvent volatile, a certain pollution to the environment.

·Alkaline oil removal: the use of alkaline solution and oil saponification reaction, the oil into water-soluble soap substances, so as to remove the oil. This method is low cost and suitable for most metal workpieces.

·Electrochemical oil removal: in the electrolyte solution, using the mechanical stirring of the electrode reaction bubbles (such as hydrogen and oxygen) to remove the oil from the surface of the workpiece. This method has high efficiency of oil removal, and also has a good cleaning effect on the tiny pores of the workpiece surface.

Ultrasonic oil removal: using the cavitation of ultrasonic wave in the liquid, produce small bubbles and instantaneous burst, produce a powerful shock wave, the oil from the surface of the workpiece shock fall. This method is suitable for artifacts with complex shapes and blind holes.


Question three: how to choose the appropriate oil removal process?

Answer: the selection of appropriate oil removal process needs to consider many factors, including the material, shape of the workpiece, the type and degree of oil pollution, and the requirements of the subsequent process.

For simple shape and light oil workpiece, alkaline or organic solvent oil removal can be selected.

For complex shapes with blind holes, ultrasonic oil removal is a good choice.

Electrochemical oil removal may be more appropriate for artifacts that require simultaneous removal of oil and oxide peel.

When choosing the oil removal process, it is also necessary to consider the cost of the process, environmental protection and the safety of the operation.

Actual case: in an aviation factory, the need to remove aluminum alloy parts. Due to the complex shape of the parts and multiple blind holes, the traditional oil removal method is not effective. By using the ultrasonic oil removal process, the oil on the surface of the parts is completely removed, and the oil in the blind hole is effectively removed, which provides a clean surface for the subsequent electroplating process.

Question four: how to judge the effect of oil removal?

Answer: There are many methods to judge the effect of oil removal, including visual inspection, water drop test, white cloth wipe test and so on.

Visual inspection: visually see whether the surface of the workpiece is clean without oil. This method is simple and intuitive, but it may be difficult to detect for minor oil stains.

Water drop test: put the water drop on the surface of the workpiece and observe the spread of the water drop. If the water droplets spread out rapidly, the surface of the workpiece is clean; if the water droplets stay like a ball, there may be oil on the surface of the workpiece.

White cloth wipe test: wipe the surface of the workpiece with a clean white cloth, and observe whether there are oil stains on the white cloth. This method is more effective for judging the slight oil pollution.

In practice, multiple methods are usually combined to judge the effect of oil removal to ensure that the cleanliness of the workpiece surface meets the requirements of the subsequent process.

Question five: What matters should be paid attention to in the oil removal process?

Answer: In the oil removal process, the following matters should be paid attention to:

Select the appropriate oil remover and process parameters: according to the work material and choose the appropriate oil remover and oil pollution type, to ensure the oil removal effect.

Control oil removal time: Excessive oil removal time may cause excessive corrosion or other side effects on the workpiece surface; excessive oil removal time may not remove oil pollution completely.

Strengthen ventilation and protection: harmful gas or steam may be produced in the process of organic solvent oil removal and alkaline oil removal, so more ventilation and personal protection are needed.

Regular inspection and maintenance of equipment: Oil removal equipment should be tested and maintained regularly to ensure its normal operation and oil removal effect.

Oil removal process is an indispensable link in the industrial field, and it is of great significance to ensure the quality of the subsequent process and product performance. By selecting the appropriate oil removal process and method, and strictly controlling the process parameters and operation process, the oil and oil pollution on the surface of the workpiece can be effectively removed, and a clean surface can be provided for the subsequent coating, electroplating and other processes. At the same time, strengthening ventilation and protection, regular testing and maintenance of equipment are also important measures to ensure the smooth progress of the oil removal process and ensure the health of operators.


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