During the processing, transportation, and storage of workpieces, the surface often carries scale, rust, mold sand, welding slag, dust, oil, and other contaminants. In order to make the deep layer firmly adhere to the surface of the workpiece, the surface of the workpiece must be cleaned before painting. Otherwise, it will not only affect the bonding strength and corrosion resistance of the coating and the base metal, but also cause the base metal to continue to corrode even with the protection of the coating, causing the coating to peel off, affecting the mechanical properties and service life of the workpiece. Therefore, the surface treatment of the workpiece before painting is an important guarantee and measure to obtain a high-quality protective layer and extend the service life of the product.
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