Kraterbildung in der Pulverbeschichtung: Ursachen, Vermeidung und Lösungen

Crater formation in powder coating: causes and solutions

Cratering is a common problem in powder coating, in which small pits or holes appear on the coated surface. These defects not only affect the appearance, but can also reduce the protective function of the coating.

Common causes of cratering

• Contaminants on the surface: Dust, oil or moisture can cause craters during the coating process.
• Unsuitable powder coatings: inferior or incorrectly stored powders can favour the formation of craters.
• Defective application: Irregular spraying techniques or incorrect settings on the coating equipment can lead to defects.
• Insufficient curing: inadequate temperature or time parameters during baking can impair surface quality.

How to avoid cratering

To prevent craters in the powder coating, you should consider the following measures:

• Thorough surface preparation: clean the workpiece carefully to remove all impurities.
• Use high-quality powder coatings: Use powder from reputable manufacturers such as Gema, Wagner or Nordson to ensure consistent quality.
• Optimal application techniques: Make sure that your coating equipment is correctly calibrated and use the correct spray parameters.
• Controlled curing conditions: Follow the powder manufacturer's recommended curing cycles to ensure complete curing.

By implementing these measures, you can effectively reduce the occurrence of craters and achieve a high-quality, even coating.