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Vortrag

Forming and corrosion stability of a laser pre-treated metal surface – Influence on the properties of metal-CFRP hybrid structures made by VARTM

Mittwoch (18.04.2018)
10:40 - 11:00 Uhr

10:40 - 11:00 Uhr

In the automotive industry, lightweight construction is an important aspect to comply with environmental requirements. A slight weight reduction results in significant savings concerning fuel consumption and CO2-emissions. The automobile manufacturers try to overcome these challenges by using lighter materials, for example, carbon fiber reinforced plastics (CFRP) or hybrid structures. Conventional manufacturing procedures of CFRP or hybrid structures are very cost and time intensive. At this point, the development of a vacuum assisted resin transfer molding (VARTM) process used in this study provides a promising possibility to realize an intrinsic (a one-step) manufacturing of steel- or aluminium-CFRP hybrid structures in short cycle times. In addition to a suitable manufacturing procedure, the interface design of hybrid metal-CFRP structures is very important to achieve a high joint strength and durability. Apart from a surface pre-treatment to ensure a good adhesion, constructive measures are mandatory to prevent contact corrosion, which is a serious problem between steel or aluminum and CFRP due to their different electrochemical potentials. The investigations in this study are focused on a nano-scale laser pre-treatment of the steel or aluminum surface and corrosion protecting interface layers. Various experimental investigations under static as well as dynamic loading in different environmental conditions have already shown that a laser pre-treatment lead to better mechanical and corrosion properties of 2D hybrid structures. The focus of this presentation lies on the forming and corrosion stability of the laser pre-treatment itself. It is analyzed, if the nano-structure generated by the laser-pre-treatment resists a 3D-forming process without provoking critical surface-near cracks. Furthermore, it is investigated, if it is possible to produce metal-CFRP hybrid structures without inserting corrosion protecting interface layers, i.e. if contact corrosion is preventable by the oxide layer itself that is formed on the metal surface during the laser pre-treatment.

Sprecher/Referent:
Carolin Zinn
Universität Paderborn
Weitere Autoren/Referenten:
  • Prof. Dr. Mirko Schaper
    Universität Paderborn
  • Zheng Wang
    Universität Paderborn
  • Prof. Dr. Thomas Troester
    Universität Paderborn