Surface analytical studies of surface-additive interactions, by means of in situ and combinatorial approaches |
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| Authors: | A Rossi M Eglin K Matsumoto ND Spencer |
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| Affiliation: | a Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology, ETH-Zürich, Switzerland
b Department of Inorganic and Analytical Chemistry, University of Cagliari, INSTM, Cagliari, Italy |
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| Abstract: | The influence of tribological conditions on the surface reactions occurring between zinc dialkyldithiophosphate (ZnDTP) and steel surfaces has been studied by means of a combination of X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectroscopy (ToF-SIMS), in situ attenuated total reflection (ATR) infrared spectroscopy, and high-throughput combinatorial approaches. Purely thermal treatment at 150 °C appears to lead to the formation of zinc polyphosphates. However, in the presence of tribological stress, simple phosphates appear to dominate, with some indication that higher load conditions lead to an increase in the surface concentration of both phosphate and, at higher temperatures, polyphosphate. |
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| Keywords: | Surface analysis X-ray photoelectron spectroscopy Time-of-flight secondary ion mass spectroscopy Attenuated total reflection infrared spectroscopy Zinc dialkyldithiophosphate Combinatorial methods In situ methods Tribochemistry |
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