Adhesion Promotion

Improved Adhesion via Plasma Nano-Coatings

© Fraunhofer IFAM
In-line atmospheric pressure plasma coating process.
© Fraunhofer IFAM
Plasma-polymer adhesion promoting layer for the eco-friendly, solvent-free bonding of glass.

Satisfactory adhesion of adhesives, paints, and coatings to substrates is a prerequisite for the effective functioning and long service life of a product. To achieve this, adhesion promoters – also referred to as primers – are often applied to a substrate prior to bonding or coating.

Example applications

  • Metallization of plastics
  • Structural bonding of light metals
  • Coating of composite materials with water-based coatings

Functions of adhesion promoters

  • Improved long-term stability of bonded joints
  • Protection of interfaces against environmental influences and media
  • Improved reliability and quality of production processes
  • Simplified production due to the larger time window between the pre-treatment and the bonding respectively coating


Advantages of plasma coating

Usually adhesion promoters have to be applied as liquid chemicals. The deposition of a plasma nano-coating as an adhesion promoting layer is an attractive alternative – in particular with plasma jets at atmospheric pressure:

  • Improved adhesion via plasma-polymer nanolayers
  • Fast, low-cost process
  • No emission of VOCs (Volatile Organic Compounds), so fewer health & safety measures required in the workplace
  • Improved use of resources due to local application and high processing speeds
  • Simplified production because there is no need for airing/evaporation times
  • Automation and process monitoring possible
  • Enhanced production reliability and stability due to adhesion improvement
  • Suitable for a wide range of substrate materials, and also composite materials, such as steel/aluminum