Direct selling pure polyester powder coating

Pretreatment before coating application of direct pure polyester powder workpiece:

1. In order to obtain high quality powder coating, the surface of the workpiece should be clean, dry oil-free metal. If the workpiece is pretreated properly, the coating will appear to have any defects during the construction, but it will crack, blister peel off in a short time.

2. The oil stain on the surface of workpiece is only used for rust prevention lubrication during processing molding, which is easy to see, as long as the dirt rust can be removed. However, it is difficult to find remove the mold lubricant in the die casting process the calendering abrasive tool lubricant in the stamping process, which will become a troublesome problem. Generally, there is magnesium oxide film on the extrusion part of aluminum products, which should be cleaned up

3. Good pretreatment process can enhance the adhesion corrosion resistance of the coating, so that the coating can retain good film after several years.

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