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Mixed Lubrication with C18 Fatty Acids: Effect of Unsaturation

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Abstract

In this paper, the lubrication mechanism of fatty acids is revisited with a new approach combining experimental and computational chemistry studies. The lubricating properties of single and mixtures of stearic, oleic and linoleic acids in a synthetic Poly-Alpha-Olefin base oil (PAO4) on iron oxide surface are investigated under mixed boundary regime with temperatures from 50 °C up to 150 °C. Low friction coefficient (about 0.055) with no visible wear is reported in the presence of single stearic acid at high temperature. This lubricating behavior is inhibited in the presence of unsaturated fatty acids highlighting an anti-synergic effect of a saturated/unsaturated mixture, especially at 150 °C. To understand the anti-synergic effect and the adsorption mechanism of these molecules, molecular dynamic (MD) and quantum chemistry simulations are performed to evaluate their diffusion coefficient in PAO4 and their adsorption mechanism on iron oxide at different temperatures. MD simulation results show a faster diffusion toward the surface for unsaturated fatty acids than for saturated fatty acid at all the studied temperatures. This means that unsaturated molecules arrive and mainly adsorb before stearic acid on the surface leading to a tribological behavior of the mixture characteristic of the unsaturated molecule. Computational chemistry suggests that all fatty acids (saturated and unsaturated) adsorption mechanism is due to the chemisorption of the carboxylic group on iron oxide surface with no desorption up to 150 °C.

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Authors and Affiliations

  1. Laboratory of Tribology and System Dynamics, Ecole Centrale de Lyon, 69134, Ecully, France

    Sophie Loehle, Christine Matta, Clotilde Minfray, Thierry Le Mogne & Jean-Michel Martin

  2. TOTAL, Solaize Research Center, BP22, 69360, Solaize Cedex, France

    Raphaele Iovine

  3. New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan

    Yukiko Obara, Ryuji Miura & Akira Miyamoto

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  1. Sophie Loehle
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  2. Christine Matta
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  3. Clotilde Minfray
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  4. Thierry Le Mogne
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  5. Jean-Michel Martin
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  9. Akira Miyamoto
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Correspondence to Sophie Loehle or Clotilde Minfray.

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Loehle, S., Matta, C., Minfray, C. et al. Mixed Lubrication with C18 Fatty Acids: Effect of Unsaturation. Tribol Lett 53, 319–328 (2014). https://doi.org/10.1007/s11249-013-0270-3

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  • DOI: https://doi.org/10.1007/s11249-013-0270-3

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