Powder coating is widely used on lots of metal parts manufacturing, becasue it can provide various color and smooth surface, make it looks great.
What is powder coating?
Powder coating is a surface finishing process that adhere dry powder on the surface of a meatal part. the finish created by this process can last longer than spray liquid painting. Powder coating is used as a metal finish mostly on industrial components.
How does Powder coating work?
Powder coating is to use powder spraying equipment to spray powders onto the surface of the workpiece. Under the action of static electricity, the powder will be evenly adsorbed on the surface of the workpiece , then baked and solidified at high temperature to form the final coating.
As shown in the picture, the powder is sprayed out by the spray gun and charged in the exit area of the spray gun. At the same time, when the workpiece is grounded, the atomized powder particles will be adsorbed on the surface of the workpiece because of the combined action of aerodynamic force, gravity and electric field force.
What Materials are Used for powder Coating
The Powder used for coating is made of of special resin, pigments, fillers, curing agents and other additives. they are mixed in a certain proportion, and then made through processes such as hot extrusion, crushing and sieving. These powders are stable in storage at room temperature.
Advantages of Powder Coating
The coatings on the surface of metal parts produced by powder coating process can prevent rust and chemical corrosion. this will improve the metal parts durability and their lifespan.
Almost all the colors can be made through powder coating process with the custom made powders. this is may difficult with other types of paint. So the surface color of metal parts can be alterd as you want by this process.
The coating is dense, have good impact strength and toughness, it can provide excellent chemical corrosion resistance and electrical insulation properties.
The sprayed powder can be recycled, and the highest utilization rate can even reach more than 99%. At the same time, the powder coating process is easy to automate, has high production efficiency which resut in a low cost.
Powder coating process use Non-toxic, solvent-free and volatile toxic substances which is good for operator health and Environment Friendly.
Disadvantage of Powder Coating
Applications of Powder Coating
The automotive compnents use powder coatings on door handles, bumpers, wheel hubs, car shells, filters, radiators, different parts of the engine to improve their durability and appearance.
Powder coating is widey used for surface decoration and corrosion protection for metal parts of furniture such as bed frames, cabinets, etc.
Electronic equipment enclosures and their metal casings use powder coating process to improve their duribity and insulation.
Tips for powder coating operation
- Clean your metal parts carefully before powder coating process, this is to get high quality result and extend the life of the coating.
- Ground your metal parts to increase the powder coating efficiency.
- Apply conductive putty on the surface of large metal parts to ensure the smoothness and glossiness result.
- Use the right cure temperature and time to avoid quality accidents due to insufficient curing.
- Inspection before curing, because metal parts is easier to repair before curing.
- Use clean and dry air becasue water in the air will cause a bad quality surface.
FAQS ABOUT POWDER COATING
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