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Powder Coating
What’s Powder Coating?
Electrophoretic coating (Electrophoretic Coating) is a coating deposition technique that utilizes electrochemical principles to deposit coatings on metal surfaces. It uses an electric field to direct charged coating particles and uniformly adhere to the workpiece surface. After curing, a dense, corrosion-resistant coating is formed.
Electrophoresis: A metal workpiece is immersed in a charged aqueous coating solution. When current is applied:
- Cathode electrophoresis (most commonly used): The workpiece acts as the cathode (negative electrode), and positively charged coating particles (such as epoxy resin) migrate toward it and are deposited.
- Anodic electrophoresis: The workpiece acts as the anode (positive electrode), and negatively charged coating particles are deposited (this technique can easily oxidize the substrate and is less commonly used).
Deposition Process: Coating particles discharge onto the workpiece surface, forming a uniform wet film. After washing and baking, the film is cured.
Powder Coating Products
Powder Coating Products
Comparison Item |
Powder Coating |
Conventional Liquid Paint |
|---|---|---|
| Environmental Impact | Zero VOC, no solvent emissions | Contains solvents, high VOC emissions |
| Material Utilization | >95% (reclaimable overspray) | 30-60% (high spray loss) |
| Coating Thickness | 50-150μm (uniform thick film) | 15-30μm (runs/sags easily) |
| Durability | Superior scratch/chemical/UV resistance | Prone to peeling/aging |
| Curing Method | High-temp cure (180-200°C) | Ambient/low-temp cure (some require 80-120°C) |
| Substrate Compatibility | Only heat-resistant metals/specially treated non-metals | Various materials (metal/plastic/wood) |
| Edge Coverage | Slightly inferior on complex geometries | Better penetration into tight spaces |
| Color/Effects | Extensive (metallic/matte/textured) | Versatile but special effects require multi-layer processes |
| Process Complexity | Requires specialized equipment, difficult rework | Suitable for manual/spray applications, easy touch-up |
| Typical Applications | Automotive wheels/appliance exteriors/architectural aluminum | Furniture/artwork/plastic components |
| Cost | High initial investment, lower long-term cost | High material waste, higher maintenance cost |
FAQ Of Powder Coating
Visit our FAQ center for more questions.
Is powder coating more durable than conventional paint?
Yes, powder coating is generally more durable than traditional liquid paint. Through high-temperature curing, powder coating forms a thicker protective layer (50-150μm) with superior scratch resistance, chemical corrosion resistance, and UV protection. Testing shows that high-quality powder coatings can last 10-15 years outdoors, whereas conventional paint typically lasts only 3-5 years.
What materials can be powder coated?
Powder coating is primarily suitable for metal materials (such as steel and aluminum), but can also be used on specially treated non-metallic materials (like MDF/medium-density fiberboard). Note that the substrate must withstand the high-temperature curing process (180-200°C), making most plastics, untreated wood, and other heat-sensitive materials incompatible with standard powder coating processes.
How to address powder coating defects (e.g., orange peel, pinholes)?
- Orange peel texture: Usually caused by uneven curing temperature or poor powder flow—adjust temperature and curing time.
- Pinholes: Often due to surface contamination or excessive coating thickness—enhance pretreatment (degreasing/sandblasting).
- Poor adhesion: Check pretreatment (e.g., phosphating) and ensure curing conditions meet standards.