114. Characterization and Removal of Die Lubricant Residue on Magnesium Die Castings

  1. Prof. Dr. K. U. Kainer
  1. Jan Ivar Skar1,
  2. Robert Orr1,
  3. Arne Henriksen1,
  4. Heike Thamerus2 and
  5. Jochen Caster2

Published Online: 22 APR 2005

DOI: 10.1002/3527603565.ch114

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications

How to Cite

Skar, J. I., Orr, R., Henriksen, A., Thamerus, H. and Caster, J. (2003) Characterization and Removal of Die Lubricant Residue on Magnesium Die Castings, in Magnesium: Proceedings of the 6th International Conference Magnesium Alloys and Their Applications (ed K. U. Kainer), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527603565.ch114

Editor Information

  1. GKSS-Forschungszentrum, Institut für Werkstoffforschung, Max-Planck-Straße, 21502 Geesthacht, Germany

Author Information

  1. 1

    Norsk Hydro Research Park, Porsgrunn, Norway

  2. 2

    Klüber Lubrication, Munich, Germany.

Publication History

  1. Published Online: 22 APR 2005
  2. Published Print: 27 NOV 2003

ISBN Information

Print ISBN: 9783527309757

Online ISBN: 9783527603565

SEARCH

Keywords:

  • characterization of die lubricant residue;
  • removal of die lubricant residue;
  • magnesium die castings;
  • DSC (Differential Scanning Calorimetry);
  • FTIR (Fourier Transform Infrared Spectrometry)

Summary

Magnesium die castings require cleaning for certain post-casting processes, for example, surface finishing. The cleaning step must remove residues of die lubricants used in the casting process. These residues otherwise influence the efficiency of subsequent processes such as the application of a conversion coating. In the present study, test plates were die cast using six different die lubricants; the lubricants were characterized using the analytical techniques of DSC (Differential Scanning Calorimetry) and FTIR (Fourier Transform Infrared Spectrometry). The plates were analyzed before and after cleaning to detect any die lubricant transfer. The analytical methods employed were measurements of contact angles of water on the metal surfaces and FTIR. A clear pattern of die lubricant residue was found on the plates before cleaning. The pattern correlated well with the melt flow into the die, i.e., most of the residue was found close to the overflows and in positions where flow fronts met. After cleaning, some of the plates still showed some lubricant residue in the same areas mentioned above. It seems that the lubricants which were most difficult to remove contained chemical species with softening temperatures above the cleaning temperature. Further investigations are underway to clarify the combined effects of lubricant properties and casting parameters on the transfer of residue.