The core process for powder coating includes the pretreatment, the retained water drying, the powder coating and the baking.
Preparation: This includes the steps of cleaning and degreasing, pickling and the producing of a thin layer. This thin layer is produced by a conversion treatment (chromating), which results in a bonding for subsequent powder coating and temporary corrosion protection. On aluminum a qualified outstanding powder coating is not possible without a pretreatment. Between the individual active processes, the parts are flushed with water and in the end with demineralized water. This deionized water results in a significant reduction of corrosion nuclei. After the wet chemical pretreatment, the drying of adhering water follows.
Powder coating: In the powder coating the powder-air-current is electrostatically charged while it flows through from guns. After emerging from the gun these charged powder clouds are preferably deposited on the grounded workpieces.. Therefore we also speak of electrostatic powder coating. The electrostatic charging helps lay the sufficient powder deposits uniformly on the workpieces, and reinforced at the later often heavily loaded edge.
Branding: For baking, the powder-coated workpieces are completely heated to the required temperature object. The necessary object temperature is depending on the powder between 170 ° C and 200 ° C. In the object temperature, the powder particles crosslink to form a powder paint film. After cooling, the parts are inspected and packaged. Then they are fully cured and therefore fully loadable.
The powder coating is environmentally friendly: It is solvent-free and resource-saving through the recovery possibility of the excess powder.