Tribology Letters

, Volume 15, Issue 3, pp 199–209 | Cite as

X-ray Photoelectron Spectroscopy Analysis of Tribostressed Samples in the Presence of ZnDTP: A Combinatorial Approach

  • Michael Eglin
  • Antonella Rossi
  • Nicholas D. Spencer


The influence of load on the chemistry of tribofilms formed on a steel surface in solution of pure di-isopropyl zinc dithiophosphate (i-ZnDTP) in n-decane has been investigated by means of a combinatorial tribological experiment involving X-ray photoelectron spectroscopy. The experiment consisted of the preparation of a set of spatially separated areas, produced under various tribological test conditions, and the subsequent spectroscopic probing of the chemical composition of the tribofilm. The experiment was carried out at room temperature under boundary-lubrication conditions and revealed a physically adsorbed layer of the additive in the non-contact area and a thin (ca. 5 nm), inhomogeneous phosphate film covering the tribostressed areas. The total amount of phosphate present in the tribostressed area was found to increase with increasing load. In the contact areas, iron oxides and metal sulfides have also been detected.

boundary lubrication isopropyl ZnDTP X-ray photoelectron spectroscopy combinatorial tribochemistry 


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Copyright information

© Plenum Publishing Corporation 2003

Authors and Affiliations

  • Michael Eglin
    • 1
  • Antonella Rossi
    • 1
    • 2
  • Nicholas D. Spencer
    • 1
  1. 1.Laboratory for Surface Science and Technology, Department of MaterialsSwiss Federal Institute of Technology, ETH ZürichZürichSwitzerland
  2. 2.Department of Inorganic and Analytical ChemistryUniversity of Cagliari, INSTMCagliariItaly

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