Aluminum coil is decorative, in addition to paying attention to its performance, we must carefully check its appearance, the quality of qualified aluminum coil, the surface can not have obvious indentation, missing coating, penetrating coating damage, and the ripple is not allowed to scratch Rub, bubble. Coil manufacturers show that these are easy to see, and the most important thing is that you should take a closer look at the color difference of the aluminum coil. If you don’t pay attention, but it will affect the final decorative effect when applied.

The current curtain wall aluminum coil will also be surface treated by electrostatic spraying. Powder coating materials are mainly made of polyurethane, swellable resin, epoxy resin and other high color retention pigments, and can be made with dozens of different colors of spray powder. The effect is also very good.

Coloring steps of aluminum coil:

1. Pretreatment, first use physical and chemical methods to clean the surface. The most important thing is to expose the aluminum coil to the substrate. This is a good oxidation process and also forms an oxide film. Some mechanical equipment can also be used to handle the pretreatment.

2. After anodizing the aluminum coil, the substrate is anodized to form a dense oxide film.

3. After sealing and anodizing, many thin film holes will appear on the oxide film. Sealing is to close the membrane pores and prevent the oxide film from being contaminated. The oxide film is transparent and adsorbable. This will deposit some metal salts in the pores, which will reveal some of the original silvery white, or many colors on the outside.