Verunreinigungen in der Pulverbeschichtung: Ursachen, Auswirkungen und Lösungen

Contaminants in powder coating: causes, effects and solutions

Contaminants in powder coatings can lead to visible defects and reduced quality of the end product. They not only affect the appearance, but also the functionality and durability of the coated parts.

Common causes of contamination

• Dust and dirt particles: Particles from the ambient air or from the surface of the workpiece can find their way into the coating.
• Oil and grease residues: Insufficiently cleaned surfaces with oil or grease films prevent an even coating.
• Fibres and lint: Textile fibres from cleaning cloths or clothing can settle on the surface.
• Moisture: water droplets or high humidity can affect the powder and cause voids.
• Contaminated powder: foreign particles in the powder coating, caused by improper storage or handling, can disrupt the coating.

How to avoid contamination

To ensure a clean and high-quality powder coating, you should take the following measures:

• Clean working environment: Keep the coating area free of dust and dirt. Regular cleaning of the booth and the surrounding area is essential.
• Thorough pretreatment: Clean the workpieces thoroughly to remove oil, grease and other residues, for example by degreasing or phosphatising.
• Use lint-free materials: Use special cleaning cloths and wear suitable work clothes to minimise the introduction of fibres.
• Humidity control: Make sure that the humidity in the coating area is within the optimal range to avoid moisture problems.
• Quality control of the powder: Store the powder coating according to the manufacturer's instructions and check it for contamination before use.
• Use high-quality equipment: Use powder coating systems from reputable manufacturers such as Gema, Wagner and Nordson, which are known for their reliability and quality.

By consistently implementing these measures, you can minimise contamination in the powder coating and achieve a first-class surface quality.