FTIR analysis and monitoring of used synthetic oils operated under similar driving conditions

Abstract

The processes of degradation of engine oils operated in passenger cars of a uniform fleet of 25 vehicles were analyzed for oxidation content using infrared (IR) spectroscopy. As part of the experiment, the changes in engine oils occurring during actual operation (under conditions which can be described as “harsh”, i.e., short distance driving, frequent starting of the engine, and extended engine idling) have been observed. An evaluation of the Fourier transform infrared spectroscopy (FTIR) spectrum of an engine oil sample was presented. The infrared spectra of both fresh and used oils were recorded with the Thermo Nicolett IS5. The tests were conducted according to the Appendix A2 of ASTM 2412. For the used engine oil differentiation process, FTIR spectra were analyzed in the regions of 1,700–2,000 cm−1 and 3,600-3,700 cm−1. The FTIR spectrometry is demonstrated to be effective for the analysis and monitoring of processes of oxidation and shown to provide rapid and accurate information relating to the aging process of engine oils. The results may facilitate decision-making regarding the service life of engine oils. The achieved dependencies can make it possible to upgrade the sensor assembly consisting of an FTIR source.

UV-Visible Spectrophotometer for Distinguishing Oxidation Time of Engine Oil

“…Interestingly, a study using a low-cost IR sensor operating in the range of 800-1100 nm demonstrated that the device could match oxidation degradation with an R 2 value as high as 0.8459 and had an R 2 value of 0.9139 when comparing their device to a commercially available UV-Vis-NIR spectrometer over a similar range [54]. Others have classified oxidation in the Mid-IR, approaching the NIR, with wavenumbers from 3600 -3700 cm −1 associated with antioxidant depletion [47]. Studies of engine oil oxidation using mid-infrared (Mid-IR) spectra have commonly looked at the carbonyl region of the spectrum (1670 cm −1 to 1800 cm −1 ).…”

“…An established norm in oxidation analysis is the use of infrared spectroscopy that can yield a plethora of detailed information about oxidation, nitration, additive depletion, and water/coolant infiltration. However, recent research using FT-IR analysis on real-world oil degradation under usual driving conditions indicated that most degradation overtime was due to oxidation [47]. Suppose a relatively inexpensive, easy-to-use method that requires only a 1 µL sample can yield relatively easy to interpret oxidation results that are comparable to those obtained by FT-IR analysis.…”

Motor oil spectral analysis for engine life-time prediction

“…Незважаючи на наявність системи очищення, насичення продуктами зносу на молекулярному рівні призводить до прискорення деградації масла та зниження показників антифрикційних, миючих властивостей тощо [1][2][3][4].…”

Study of the Effect of Physicochemical Degradation and Contamination of Motor Oils on Their Lubricity

“…Understanding the degradation processes that occur in motor oil in operation is important with respect to meeting current and future requirements. Researchers are also studying motor oil degradation with a view to optimizing the replacement intervals [29][30][31] and setting up the maintenance systems [32][33][34][35].…”