Process Of Powder Coating
|Powder coating equipment (electrostatic spraying machine) is used to spray the powder coating on the surface of the workpiece. Under the action of static electricity, the powder will be uniformly adsorbed on the surface treatment of the workpiece to form a powdery coating; the powdery coating is leveled by high-temperature baking When cured, it becomes the final coating with different effects (different kinds of effects of powder coatings).|
- 1. The purpose of pretreatment: to remove the oil stain, dust and rust on the surface of the workpiece, and to form a “phosphating layer” or “chromizing layer” on the surface of the workpiece that is resistant to corrosion and can increase the adhesion of the spray coating. Main process steps: oil removal, rust removal, phosphating (chromization), passivation. After the pre-treatment of the workpiece, not only the surface is free of oil, rust, and dust, but also a uniform and rough gray phosphate film (chromized film) that is not easy to rust is formed on the silvery white shiny surface, which can prevent rust and Can increase the adhesion of the spray coating. There are three types of pretreatments: immersion type, spray type, and waterfall type. The immersion type requires multiple immersion tanks; spraying requires a spray line on the spraying line; the waterfall type means that the solution flows down from the height directly along the workpiece.
- 2. Powder spraying purpose: uniformly spray the powder coating on the surface of the workpiece. Special workpieces (including locations prone to electrostatic shielding) should be sprayed with high-performance electrostatic spray machines. Process steps: Using the principle of electrostatic adsorption, uniformly spray a layer of powder coating on the surface of the workpiece; the fallen powder is recovered through the recovery system and can be reused after sieving
- 3. Curing Purpose: To solidify the sprayed powder on the surface of the workpiece. Process steps: Put the sprayed workpiece in a high-temperature furnace at about 200 ° C for 20 minutes (the curing temperature and time depend on the quality of the selected powder, and the special low-temperature powder curing temperature is about 160 ° C, which saves energy), so that the powder is concentrated Melt, level and solidify.
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