Sponsor:
AiF (Arbeitsgemeinschaft industrieller Forschungsvereinigungen, working
group for industrial research associations) IGF-Vorhaben-Nr. 16532 BR (project number)

Founded project partners:
- Dresden Fraunhofer IWS (Fraunhofer Institut für Werkstoff- und Strahltechnik  Dresden)
- Leibniz-Institut für Polymerforschung Dresden e. V. (IPF)

Associated project partners:
DELO Industrie Klebstoffe, Windach
EdgeWave GmbH, Würselen
Erbslöh AG, Velbert
Lohmann GmbH & Co KG, Neuwied
Clean-Lasersysteme GmbH, Herzogenrath
INPRO Innovationsgesellschaft, Berlin
Stepanski Engineering, Leverkusen

Coworkers:
Dr. Frank Simon
Dr. Ralf Frenzel

Duration:
05/2010 - 03/2013

Abstract:
The project results showed that the combination of a laser pre-treatment and subsequent application of poly(vinyl amine) is an effective method in enhance the strength of adhesive bonds between joining parts of magnesium-containing aluminum alloys. The application of the polymer coating layer seemed to be suitable to conserve the freshly cleaned and activated state of the metal oxide layer formed during the laser pre-treatment. Hence, the joining of parts can be also performed after a longer storage period without refreshment of the adhesive surfaces. Different application techniques were developed to offer the opportunity to integrate the polymer coating in industrial processes. Branches using lightweight constructions, such as automotive and aviation industries may be interested in the development. The strategy to conserve the chemical activity of appropriately pre-treated aluminum alloy surfaces is of high importance for small and medium-sized manufacturers, who do not have own equipment and knowledge to pre-treat joining part in the quality required.

final report  (german)