Powder coatings are based on polymer resin systems, combined with remedial, pigments, leveling agents, flow modifiers, and other additives. These ingredients are melted mixed, cooled, and ground into a uniform powder.
A process called electrostatic spray deposition (ESD) is typically used to achieve the application of the powder coating to a metal substrate. This application method uses a spray gun, which applies an electrostatic charge to the powder particles, which are then attracted to the grounded part.
After application of the powder coating, the parts enter a curing oven where with the addition of heat (180 ‘C – 200’C) the coating chemically reacts to produce a decorative attractive finishing look.
This type of application is the most common method of applying powders. Sometimes a powder coating is applied during a fluidized bed application. Preheated parts are dipped in a hopper of fluidizing powder and the coating melts and flows out on the part. Post cure may be needed depending on the mass and temperature of the part and the type of powder used. No matter which application process is utilized, powder coatings are easy to use, environmentally friendly, and cost-effective