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Structural Changes in Tribo-Stressed Zinc Polyphosphates

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Abstract

The influences of pressure, shear stress and temperature on the structure of zinc orthophosphate and zinc metaphosphate was investigated. Tribological tests were performed to study the combined effect of pressure and shear stress at two temperatures. Friction tests were carried out in the boundary lubrication regime from dispersions of zinc polyphosphates in base oil. The effects of pressure alone were investigated using a diamond anvil cell in order to separate it from those of shearing. Raman spectroscopy was used to follow in situ or ex situ the structural changes of the zinc polyphosphate powders and the tribo-stressed areas. Tribofilms obtained with both polyphosphates display a partial and full depolymerization of the zinc metaphosphate at ambient and high (120 °C) temperature, respectively. The large stress and strain conditions of the tribological tests are necessary to induce a tribochemical reaction between zinc metaphosphate and iron oxide leading to a depolymerization of the phosphate in the tribofilm. The tribochemical reaction and antiwear tribofilm formation are significantly enhanced by the modest temperature increase from ambient to 120 °C. Pressure alone induces only disordering in the structure of zinc polyphosphates, with only minor changes of the chain length in phosphates and does not contribute significantly to the observed structural changes in tribofilms.

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Acknowledgments

The authors would like to thank the “Région Rhone-Alpes” for financial support through the “ARC Energies”. The Raman facility at ENS Lyon is supported by the Institut National des Sciences de l’Univers (INSU).

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Authors and Affiliations

  1. LTDS, Ecole Centrale de Lyon, UMR 5513, 36 Avenue Guy de Collongue, 69134, Ecully, France

    Sophia Berkani, Fabrice Dassenoy, Clotilde Minfray & Jean-Michel Martin

  2. LGL, Ecole Normale Supérieure de Lyon, Université Claude Bernard Lyon1, CNRS, 15 Parvis René Descartes, 69364, Lyon, France

    Sophia Berkani, Herve Cardon, Gilles Montagnac & Bruno Reynard

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  1. Sophia Berkani
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  2. Fabrice Dassenoy
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  3. Clotilde Minfray
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  4. Jean-Michel Martin
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  6. Gilles Montagnac
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Correspondence to Fabrice Dassenoy.

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Berkani, S., Dassenoy, F., Minfray, C. et al. Structural Changes in Tribo-Stressed Zinc Polyphosphates. Tribol Lett 51, 489–498 (2013). https://doi.org/10.1007/s11249-013-0188-9

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  • DOI: https://doi.org/10.1007/s11249-013-0188-9

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