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XPS study of the influence of temperature on ZnDTP tribofilm composition

Heuberger, Roman ; Rossi, Antonella ; Spencer, Nicholas D.

In: Tribology Letters, 2007, vol. 25, no. 3, p. 185-196

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    Title
    • XPS study of the influence of temperature on ZnDTP tribofilm composition
    Author
    • Heuberger, Roman. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Rossi, Antonella. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    • Spencer, Nicholas D.. Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, CH-8093, Zurich, Switzerland
    Document Type
    • Postprint
    Language
    • English
    Published in
    • Tribology Letters, 2007, vol. 25, no. 3, p. 185-196. Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com
    Other Version
    OAI-PMH Identifier
    • oai:doc.rero.ch:311679
    Summary
    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