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MoS2 Films Formed by In-contact Decomposition of Water-soluble Tetraalkylammonium Thiomolybdates

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Abstract

Synthesis and tribological evaluation of three tetraalkylammonium thiomolybdate (R4N)2MoS4 (R = methyl, propyl, or ammonia) aqueous-based lubricant additives on a ball-on-disk tribometer was carried out for a steel–aluminum contact. Tests were performed at the same conditions of load, entrainment speed, sliding distance, temperature, and concentration of MoS2 to compare the activity (lubrication effect) of the thiomolybdates prepared. A friction reduction is observed for the three salts compared to pure water; however, significant differences in friction coefficient are observed depending on the alkyl group. SEM/EDAX and Raman analysis of the wear tracks reveal the in-contact formation of a MoS2-lubricating film, rich in molybdenum and sulfur.

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Acknowledgments

The authors wish to express their sincere thanks to the National Council for Science and Technology (CONACyT—Projects 46871 and 43634) for the financial support to carry out the present work.

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Correspondence to Fernando Chiñas-Castillo.

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Chiñas-Castillo, F., Lara-Romero, J., Alonso-Núñez, G. et al. MoS2 Films Formed by In-contact Decomposition of Water-soluble Tetraalkylammonium Thiomolybdates. Tribol Lett 29, 155–161 (2008). https://doi.org/10.1007/s11249-007-9292-z

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Keywords

  • Tribological
  • Additive
  • Water-soluble
  • Friction
  • Wear
  • Film forming