Engine oil ageing under laboratory conditions

Vipper, A. B.; Zadko, I. I.; Ermolaev, M. V.; Oleinik, J. Y.

doi:10.1002/ls.3010140307

Cited by 10 publications

(3 citation statements)

References 3 publications

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“…Usually, the ageing of engine oils is characterized by oxidation, additive depletion and neutralization of the oil. However, the thermal oxidative stability is the most important property to be considered because they have a great influence on changes in viscosity and viscosity index, density, and tribological properties [16,17]. Engines work efficiently in the range between 90 and 100 °C under normal operation, so a good lubricant is required to show minimal degradation at these temperatures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Farfán-Cabrera

Gallardo-Hernández

Perez‐González

et al. 2019

Wear

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Bio-lubricants have emerged as a potential and viable way to replace, totally or partially, mineral oils due to their effectiveness in the boundary lubrication regime for different applications, including, automotive engine operation. However, the effect of thermo-oxidation caused by the long-term use of the bio-lubricants on their tribological properties has been scarcely analyzed. In this work, the effect of thermo-oxidation of Jatropha oil (JO), an engine mineral oil (EMO) and a blend made up of 80%vol. EMO and 20%vol. JO (B20) on the tribological behavior of a simulated piston ring/engine cylinder liner interface was studied in reciprocating friction tests at 26 and 100°C. The oils were thermally oxidized and characterized in terms of carbonyl compounds, depletion of ZDDP additives, changes in kinematic viscosity and viscosity index. Friction coefficients, wear rates and scar morphologies were assessed. Thermo-oxidation resulted in significant viscosity increases in JO compared to EMO and B20. Also, it generated increased friction coefficients for JO and B20. However, they were lower than those for fresh and aged EMO. EMO increased the wear rate after thermo-oxidation in contrast to JO. Smearing was generated using most oil samples while severe scuffing was only produced by using fresh JO at 100°C.

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Section: Introductionmentioning

confidence: 99%

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Farfán-Cabrera

Gallardo-Hernández

Perez‐González

et al. 2019

Wear

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“…The sediment and gum formation mechanisms have been studied in great details [3] and can be summarized as acid-base reactions involving N, 0, and S species, free radical induced polymerization reactions involving unsaturated hydrocarbons, and esterification reactions involving aromatic and heterocyclic species. Many studies have indicated that certain sulfonic acids [4], organic nitrogen compounds [5], and olefins [6] when added to fuels that are then subjected to thermal or oxidative stress, tend to produce insoluble sediments.…”

Section: Introductionmentioning

confidence: 99%

The Ability of Anilines Extracted from Iraqi Petrol on Preventing Deposits Formation in Crude Kerosene

Al-Ghani¹

2015

OGCE

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The oxidative degradation products formed under both the prolonged storage and thermal stress are a problem in the utilization of Kerosene fuels. Researchers are directed in developing fuel stabilizers that are increasingly cost-effective, do not degrade the performance of fuel and are environmentally acceptable. Our interest in anilines extracted from Iraqi crude oil has led to evidence that they are excellent antioxidant stabilizers for tetraline at elevated temperatures. The results of stability experiments for thermal and oxidative degradation of two crude Kerosene fuel samples obtained from al-Dora refinery with 0.20% sulfur contents (sample A), and from Kirkuk refinery with 0.25% sulfur contents (sample B) were evaluated in these stability tests in comparison with other well-known stabilizers. The samples were treated as follows: 1.They subjected to long period of storage (90 days) without any additives. 2. They exposed to thermal aging at elevated temperature (393K) without any additives for 3 hours. Chemical factors preventing formation of color, insoluble sediments and gums were studied by modeling generally accepted degradation mechanisms. In this paper we will report our mechanistic investigation into the chemical details of the stabilization and effect of chemical structure of extracted N,N-P-methyl phenyl acetone (MPA) and N, N-phenyl acetone (PA)on the activity of deposits formation in kerosene in a comparison with 2, 6-di-t-butyl-4-methyl phenol (Unol), and tertiary alkyl primary aniline (TAPA) with 9, and 12 carbon atoms.

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“…It has been suggested that the level of this degradation affects the tribological contacts between the piston rings and liner, and the piston rings and piston [5,6]. Work has been undertaken by a number of researchers to investigate fresh oil, degraded oil sampled from a sump and aged oil in laboratory simulators [7,8] however this is the first time that tribological analysis has been undertaken on oil sampled directly from the ring pack. This is due in part to the complications of operating such a sampling system and the need for relatively large quantities of oil (20-30ml).…”

Section: Introductionmentioning

confidence: 99%

The Tribological and Chemical Analysis of Top Ring Zone Samples of Fully Formulated Oil Taken From a Four Stroke Gasoline Engine

Lee

Priest

Stark

et al. 2005

World Tribology Congress III, Volume 2

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With increasing pressure on engine oil manufacturers to extend oil drain intervals and reduce fuel consumption, whilst changing the composition of fully formulated oils to meet the new CEC, ILSAC and OEM specifications, there is an ever increasing need to understand the effect of oil degradation on the operating conditions and tribological performance of engines [1]. This work samples oil from the rear of the top piston ring of an engine during the first 15 minutes from cold start and operating at steady state under three different loads. These samples, used 40 hour sump oil and fresh oil have been subjected to tribological tests and chemical analysis.

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Engine oil ageing under laboratory conditions

Abstract: KeywordsThis paper was first presented at the 13th International Colloquium on Tribology,

Cited by 10 publications

References 3 publications

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

Effects of Jatropha lubricant thermo-oxidation on the tribological behaviour of engine cylinder liners as measured by a reciprocating friction test

The Ability of Anilines Extracted from Iraqi Petrol on Preventing Deposits Formation in Crude Kerosene

The Tribological and Chemical Analysis of Top Ring Zone Samples of Fully Formulated Oil Taken From a Four Stroke Gasoline Engine

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