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Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 62,
  • Issue 7,
  • pp. 810-816
  • (2008)

New Method of Simulation to Evaluate the Sensitivity to Oxidation of Lubricating Oils: An Aging Cell Coupled with Fourier Transform Infrared Spectroscopy

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Abstract

This study presents a new method for evaluating the oxidation of lubricating oils. An aging cell adapted to a Fourier transform infrared (FT-IR) spectrometer allows the continuous and direct study of the oxidative aging of base oils. During the test, oxidation bands appeared in the spectra (carbonyl bands around 1730 cm<sup>−1</sup>). The graphic representation of the carbonyl band modification—using a spectroscopic index—makes it possible to monitor the evolution of the lubricant composition. Comparing the oxidation constants, determined from the kinetic plots of several base oils, makes it possible to evaluate their relative sensitivity.

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