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.