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Powder coating

Surface coating operations in which both the workpiece and the surface treating agent is charged to create an attracting force.

Illustration of Powder coating

The process

The workpiece must be thoroughly cleaned prior to powder coating. The workpiece act as a cathode and the spray nozzle as an anode. The surface treating agent in powder form [1] is blown through the sprayer by an air stream [2] out of the nozzle where it is ionized and continues to move to the workpiece in the form of a continuous cloud of dust. The particles are charged so that they are attracted to and adheres to the surface of the workpiece and creates a thin coating. To some extent also coating the backside via the air currents which makes the method has the ability to coat difficult surfaces consistently. The workpiece must then pass through a furnace for the paint to cure.