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Study of Surface Films of Overbased Sulfonates and Sulfurized Olefins by X-Ray Absorption Near Edge Structure (XANES) Spectroscopy

[+] Author Affiliations
M. T. Costello

Crompton Corporation, Middlebury, CT

Paper No. WTC2005-63880, pp. 651-652; 2 pages
  • World Tribology Congress III
  • World Tribology Congress III, Volume 1
  • Washington, D.C., USA, September 12–16, 2005
  • Conference Sponsors: Tribology Division
  • ISBN: 0-7918-4201-0 | eISBN: 0-7918-3767-X
  • Copyright © 2005 by ASME


Four-ball EP tests were completed for lubricating oils containing the synergistic combination of overbased calcium sulfonate and sulfurized olefin. Using XANES spectroscopy we were able to differentiate between FeS, RSO3 − and SO4 2− in the sulfur K-edge and L-edge spectra. It was found while the sulfurized olefin reacts very strongly with the substrate to form FeS, the overbased calcium sulfonate does not react strongly with the substrate unless sulfurized olefin present.

Copyright © 2005 by ASME



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