Powder Coating Application: Corona Charging Electrostatic Spray

Corona charging is the most common method used in powder application. The process disperses powder into an air stream to make a cloud of powder as it leaves the gun. The particles pass through a charged corona field at the gun tip, which applies a strong negative charge to each particle. These particles have a strong attraction to the grounded part and deposit there stick to it, then can be cured to stay on. 

Advantages:

• Heavy films
• High transfer efficiency
• Only one oven needed because parts are sprayed cold
• Applies quickly
• Can be automated
• Minimum operator training
• Works with most chemistries

Disadvantages:

• Requires high voltage source
• Some difficulty with deep recesses
• Thickness control sometimes difficult
• Capital cost higher than other application methods

For more information about Corona charging, read TCI’s Troubleshooting Guide.