What should I pay attention to in the pre-treatment section of the painting production line? During processing, transportation and storage, the surface of the workpiece is often covered with scale, rust, molding sand, welding slag, dust, oil and other dirt. In order to make the deep layer firmly adhere to the surface of the workpiece, the surface of the workpiece must be cleaned before coating.
Otherwise, it will not only affect the bonding force and corrosion resistance of the coating and the base metal, but also make the base metal continue to corrode under the protection of the coating, causing the coating to peel off, affecting the mechanical properties and service life of the workpiece. Therefore, surface treatment before the workpiece is painted is an important guarantee and measure to obtain a high-quality protective layer and prolong the service life of the product.
In order to provide a good surface of the workpiece, there are the following points before surface treatment:
1. No oil and moisture
2. No rust and oxide
3. No adhesive impurities
4. No acid, alkali and other residues
5. The surface of the workpiece has a certain degree of roughness.
Common surface treatment methods include:
Chemical treatment: mainly use acidic or alkaline solution to react with the oxide and oil on the surface of the workpiece, and dissolve it in the acid or alkaline solution to remove the rust and oil on the surface of the workpiece. Chemical treatment is suitable for cleaning thin plate parts, but the disadvantage is that if the time is not properly controlled, steel will be corroded even if corrosion inhibitors are added.
Mechanical treatment: mainly includes shot blasting and shot blasting. Shot blasting is a method that uses centrifugal force to accelerate projectiles and spray them onto the workpiece for rust removal and cleaning. However, the flexibility of shot blasting is poor and limited by the site, resulting in blindness in cleaning the workpiece. The inner surface of the workpiece is prone to dead corners that cannot be cleaned. The equipment has a complex structure, many wearing parts, especially wearing parts such as blades, which wear quickly, take a long time to repair, high cost, and large one-time investment.
With the continuous improvement of science and technology, people have higher and higher requirements for product quality, and various high-tech equipment continue to be widely used in enterprises. With the improvement of people's environmental awareness and the strict requirements of environmental protection departments, it is urgent to control the dust pollution and noise environment.
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