Schlechte Haftung in der Pulverbeschichtung: Ursachen, Auswirkungen und Lösungen

Poor adhesion in powder coating: causes, effects and solutions

Poor adhesion of the powder coating can lead to serious quality issues, such as peeling of the coating and reduced corrosion protection. This problem not only affects the aesthetics of the product, but also its durability and functionality.

Common causes of poor adhesion

• Insufficient surface preparation: Residues of oil, grease, rust or other contaminants on the surface can affect the adhesion of the powder.
• Lack of or incorrect pre-treatment: inadequate chemical or mechanical pre-treatment can have a negative effect on adhesion.
• Insufficient grounding: poor grounding of the workpiece can lead to uneven powder adhesion.
• Incorrect application parameters: unsuitable settings on the coating system, such as powder output that is too high or too low, can impair adhesion.
• Moisture in the powder coating: Moist powder coating can have a negative effect on the adhesion and quality of the coating.

How to avoid poor adhesion

To ensure that the powder coating adheres optimally, you should take the following measures:

• Thorough cleaning: Remove all contaminants using suitable cleaning processes such as degreasing, sandblasting or chemical treatments.
• Selectthe appropriate pre-treatment method, such as phosphating or chromating, according to the substrate material.
• Optimal grounding: Ensure that the workpiece is well grounded during the coating process to enable even powder adhesion.
• Correct application settings: Adjust the parameters of your coating system according to the powder manufacturer's recommendations and the workpiece geometry.
• Use high-quality equipment: Use coating systems from reputable manufacturers such as Gema, Wagner and Nordson to ensure precise and even coating.
• Control of environmental conditions: Ensure that temperature and humidity in the coating environment meet requirements to prevent moisture absorption of the powder coating.

By consistently implementing these measures, you can optimise the adhesion of your powder coatings and achieve high-quality, long-lasting surfaces.