Adhesion Problems

Coating adhesion problems, similar to wetting defects, can be caused by contamination of the component surface (e.g., release agents, greases, or oils). However, these contaminations can also be introduced through process steps (e.g., blowing off the surface). Sometimes, unsuitable coating systems are also used that are incompatible with the component’s material. Coating adhesion is reduced.

Many plastics require surface activation, such as flame treatment, fluorination, or plasma treatment. If this is not performed correctly, coating adhesion can also be reduced. For analysis, specialized surface analytics like ESCA are required to detect the often thin changes on the surface or at the interface.

Proper cleaning of the component surface before coating can help prevent coating adhesion problems. However, a well-intentioned cleaning can also be the cause of coating adhesion problems, specifically when residues from the cleaning process dry on the surface. Sometimes, coating adhesion problems only become apparent later when the surface is exposed to extreme conditions, such as steam jet testing or climate storage.