Friction reduction by metal sulfides in boundary lubrication studied by XPS and XANES analyses

Friction reduction by metal sulfides in boundary lubrication studied by XPS and XANES analyses In this work, the antiwear action of zinc dithiophosphate (ZnDTP) in combination with friction modifier agent molybdenum dithiocarbamate (MoDTC) has been investigated. A Cameron–Plint friction machine was used to generate large tribofilm areas in mild tribological conditions. Two analytical techniques, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectroscopy, have been employed to characterize the chemical species in tribofilms. XANES spectroscopy at the P K and L-edge, Mo L and M-edge and S K-edge was carried out in order to investigate phosphates and sulfides species in the tribofilms This was followed by XPS analysis in the same location in the tribofilms. Special attention has been paid to the peak fitting of Fe 2p, Zn 2p, S 2p, Mo 3d and O 1s photopeaks and Auger ZnLMM lines. The combined analyses have shown that the MoDTC+ZnDTP containing oil produces mainly shorter chain metal polyphosphate material in addition to ZnS and MoS 2 . No zinc sulfate has been detected. XPS confirms that the formation of MoS 2 is enhanced by the presence of ZnDTP. For all additives combinations; no iron has been detected in the tribofilms. Analytical results are discussed and compared with theoretical predictions from the Chemical Hardness model for ZnDTP, MoDTC and ZnDTP+MoDTC tribofilms formation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Wear Elsevier

Friction reduction by metal sulfides in boundary lubrication studied by XPS and XANES analyses

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Publisher
Elsevier
Copyright
Copyright © 2003 Elsevier Science B.V.
ISSN
0043-1648
eISSN
1873-2577
D.O.I.
10.1016/S0043-1648(03)00237-0
Publisher site
See Article on Publisher Site

Abstract

In this work, the antiwear action of zinc dithiophosphate (ZnDTP) in combination with friction modifier agent molybdenum dithiocarbamate (MoDTC) has been investigated. A Cameron–Plint friction machine was used to generate large tribofilm areas in mild tribological conditions. Two analytical techniques, X-ray photoelectron spectroscopy (XPS) and X-ray absorption near edge structure (XANES) spectroscopy, have been employed to characterize the chemical species in tribofilms. XANES spectroscopy at the P K and L-edge, Mo L and M-edge and S K-edge was carried out in order to investigate phosphates and sulfides species in the tribofilms This was followed by XPS analysis in the same location in the tribofilms. Special attention has been paid to the peak fitting of Fe 2p, Zn 2p, S 2p, Mo 3d and O 1s photopeaks and Auger ZnLMM lines. The combined analyses have shown that the MoDTC+ZnDTP containing oil produces mainly shorter chain metal polyphosphate material in addition to ZnS and MoS 2 . No zinc sulfate has been detected. XPS confirms that the formation of MoS 2 is enhanced by the presence of ZnDTP. For all additives combinations; no iron has been detected in the tribofilms. Analytical results are discussed and compared with theoretical predictions from the Chemical Hardness model for ZnDTP, MoDTC and ZnDTP+MoDTC tribofilms formation.

Journal

WearElsevier

Published: May 1, 2003

References

  • Sampling depth of total electron and fluorescence measurements in Si L and K-Edge absorption spectroscopy
    Kasrai, M.; Lennard, W.N.; Brunner, R.W.; Bancroft, G.M.; Bardwell, J.A.; Tan, K.H.

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