B.I. Kovalsky, V.G. Shram, Yu.N. Bezborodov, E.G. Kravtsova, V.I. Vereshchagin, V.I. Afanasov
DOI: 10.25699/SSSB.2020.30.62651 Download PDF
Abstract: The results of a study of the thermal-oxidative stability of Rosneft Maximum 10W-40 SL/CF partially synthetic engine oil at three temperatures of 180, 170 and 160 ºС are presented, which made it possible to determine the effect of temperature on oxidation processes. The research methodology provided for the use of the following measuring and testing tools - a device for thermostating of lubricants, a photometric device for direct photometry of oxidized oils and electronic scales. One of the objectives of the study is to prove the instability of oxidation processes due to the presence of products of different energy intensity. The dependences of the optical density and volatility of the studied engine oil on the oxidation time are presented. It was found that with decreasing temperature, the rate of oxidation and evaporation decreases. In addition, there is a temporary region in which oxidation processes do not occur, i.e., there is a period of resistance to oxidation. A method for controlling the oxidation mechanism is proposed, which consists in assessing the increment of the oxidation rate, which allows one to determine the intensity of the processes depending on the test temperature and to establish the presence of redistribution of thermal energy between the products of oxidation and evaporation. Two types of oxidation products of different energy intensity, causing a change in the thermo-oxidative stability of the lubricant, have been established. As a result of the studies, it was shown that the use of the increment in the rate of change in optical density, volatility, and the indicator of thermo-oxidative stability in the process of oxidation of lubricating oils allows one to evaluate the redistribution of thermal energy between the products of oxidation and evaporation, as well as to determine the time of the onset of transformations, their intensity, optical density and temperature dependent test.
Index terms: optical density, thermo-oxidative stability, increment of the rate of oxidation, evaporation and temperature transformations, potential resource.


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