J. Phys. IV France 7 (1997) C2-847-C2-849
Application of XAFS in Tribology : P and S L-Edge XANES Spectroscopy of Antiwear FilmsM. Kasrai1, Z. Yin1, M. Fuller1, G.M. Bancroft1, K. Fyfe2 and K.H. Tan3
1 Department of Chemistry, University of Western Ontario London, Ontario, N6A 5B7, Canada
2 Imperial Oil Products Division, Sarnia Research Centre, P.O. Box 3022, Sarnia, Ontario N7T 7M1, Canada
3 Canadian Synchrotron Radiation Facility University of Wisconsin, Wisconsin 53589, U.S.A
Antiwear additives are added to engine oils in the form of Zinc dialkyl dithiophosphates (ZDDPs). They form an antiwear (tribochemical) film on the rubbing surfaces. High resolution P and S L-edge X-ray absorption near edge (XANES) spectroscopy has been used to characterize the chemical nature of the films formed under air and inert atmosphere. The total electron yield and fluorescence yield detection methods have been employed to investigate the near surface and bulk composition of the films.
© EDP Sciences 1997