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.

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