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Tribology Letters

, Volume 25, Issue 3, pp 185–196 | Cite as

XPS study of the influence of temperature on ZnDTP tribofilm composition

  • Roman Heuberger
  • Antonella Rossi
  • Nicholas D. SpencerEmail author
Article

Abstract

Antiwear additives, such as zinc dialkyldithiophosphate (ZnDTP), find application in many different industrial sectors. Although it is understood that certain ZnDTP concentrations need to be used to achieve an effective antiwear performance, there has been very little work published concerning the effect of temperature on the interactions of the additive and its adsorption mechanism on steel. In this article, 100Cr6 (52100) steel ball-on-disc experiments under solutions of zinc dialkyldithiophosphate (ZnDTP) in poly-α-olefin (PAO) were performed at different temperatures, ranging from 25 to 180 °C. The discs were analysed after the experiments by means of small-area, imaging and angle-resolved X-ray photoelectron spectroscopy (XPS). The composition of the reaction film was found to change as a function of the applied temperature and also to vary within the film as a function of depth: Longer polyphosphate chains were found at higher temperatures as well as towards the outer part of the reaction film.

Keywords

XPS ZnDTP boundary lubrication tribochemistry 

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Roman Heuberger
    • 1
  • Antonella Rossi
    • 1
    • 2
  • Nicholas D. Spencer
    • 1
    Email author
  1. 1.Laboratory for Surface Science and Technology, Department of MaterialsETH ZurichZurichSwitzerland
  2. 2.Dipartimento di Chimica Inorganica ed AnaliticaUniversità degli Studi di Cagliari, INSTM Research Unit, Cittadella Universitaria di MonserratoCagliariItaly

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