Electrostatic Spray (Corona Charging)
Corona charging is the most common method used in powder
coating. This process disperses finely
ground powder into an airstream, producing a cloud as it exits the gun. The powder particles pass through a highly
charged and ionized corona field at the tip of the gun applying a strong
negative charge to each particle. These
particles then have a strong attraction to the grounded part and deposit
there. This process can apply coatings
between 0.8 and 10 mils in thickness and can be used for decorative and
functional coatings. Most coatings with
the exception of nylon can be applied using this process.
Advantages:
- Heavy films are easier to build
- High transfer efficiency
- Only one oven, spray parts cold
- Applies quickly
- Can be automated
- Minimum operator training
- Works with most powders
Disadvantages:
- Difficult color changes in automatic systems
- Requires a high voltage source
- Faraday areas can create application issues and present some difficulty coating deep recesses.
- Part configuration can make it difficult to control film Thickness
- Capitol cost can be higher than other application methods
For more information on powder coating methods, please see or
download our powder
coating technical guide on our website.
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