Commonly used are black and natural color oxidation; Aluminum plates need to be sprayed after chromate oxidation. Surface pretreatment can clean the surface, significantly improve the adhesion of the film, and double the corrosion resistance of the film. In the cleaning process, first clean the workpiece, first hang the workpiece on the assembly line, first clean the solution (alloy degreasing powder), then enter clean water, then pass through the spray area, then pass through the drying area, and finally remove the workpiece from the assembly line. This is the general process of ordinary sheet metal processing. The work is simple, but sometimes it is difficult to do. To make a high-level and high-quality sheet metal product, it is not easy to talk about it. It requires a lot of practice and understanding of sheet metal platforms.

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