Oxidation stability of lubricating base oils

Elnaggar, Ashraf Y.; El-Adly, R. A.; Altalhi, Tariq; Alhadhrami, A.; Modather, F.; Ebiad, Mohamed A.; Salem, A.

doi:10.1080/10916466.2017.1403450

Cited by 16 publications

(9 citation statements)

References 9 publications

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“…This is probably due to the formation of degradation products in oils. The results are in line with different studies that have confirmed the effect of degradation products 42,45,46 on the physical property of oils. The current study shows how the oil degradation can influence the increase in viscosity even after soot removal as demonstrated in Figure 9…”

Section: Physical Properties Of Oilssupporting

confidence: 92%

Chemical and physical assessment of engine oils degradation and additive depletion by soot

Omar

Salehi

Farooq

et al. 2021

Tribology International

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Section: Physical Properties Of Oilssupporting

confidence: 92%

Chemical and physical assessment of engine oils degradation and additive depletion by soot

Omar

Salehi

Farooq

et al. 2021

Tribology International

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“…In case of high‐temperature oxidation (>120°C), breakdown of peroxides including hydroperoxides becomes predominant, and the resulting carbonyl compounds gets oxidised to carboxylic acids (Figure 2). For this reason, an increase in acid number is observed 17 …”

Section: Introductionmentioning

confidence: 99%

“…For this reason, an increase in acid number is observed. 17 With the progress of oxidation, acid or base-catalysed Aldol reactions may also occur. The reaction pathway is depicted in Figure 3 which suggests that α, β-unsaturated aldehydes or ketones are formed, ultimately leading to the formation of high-molecular-weight ingredients.…”

Section: Introductionmentioning

confidence: 99%

“…The reaction pathway is depicted in Figure 3 which suggests that α, β-unsaturated aldehydes or ketones are formed, ultimately leading to the formation of high-molecular-weight ingredients. [17][18] Antioxidants added in optimised concentrations within lubricants inhibit oxidative degradation thus providing a prolonged service life for lubricants.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics study of cold rolling lubricant degradation through advanced instrumental techniques

Chakraborty

Giri²,

Pandit

et al. 2022

Lubrication Science

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Research was focused on understanding the degradation kinetics of cold rolling oil used in the rolling mill at Tata Steel. Aged rolling oil leads to various surface defects. Ageing phenomenon is influenced through thermo-mechanical behaviour, oxidation, hydrolysis and presence of iron fines. Ageing of cold rolling oil in presence of iron fines was systematically performed at various temperature followed by thermo-mechanical wear tests. With variation in intensity of ageing, change in physico-chemical parameters and fatty acid distribution (FAD) within triglycerides could be observed. The impact of the controlled ageing on performance parameters like lubrication, evaporation kinetics and oxidative stability were also studied. Thermo-oxidative ageing depletes antioxidant concentration within the rolling oil resulting in rapid oxidation of unsaturated fats. This leads to rapid build-up of high molecular weight ingredients resulting in formation of fatty acid soaps or scum. The resultant scum negatively impacts the boundary lubrication and evaporation kinetics of rolling oil.

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“…Oxidation can increase lubricant's viscosity and result in sludge formation, filter plugging, etc. hence lowering the performance . It is also observed that the presence of saturated fatty acids in vegetable oils has an adverse effect on their pour point .…”

Section: Introductionmentioning

confidence: 99%

Experimental and quantum chemical investigations on the oxidative stability of sesame oil base stock with synthetic antioxidant additives

Sabarinath

Nair

Rajendrakumar

2018

Lubrication Science

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Depleting resources and increasing environmental pollution caused by the petroleum products made researchers to think about its biodegradable counterparts. Vegetable oils due to its characteristics such as availability, renewability, eco‐friendliness, and biodegradability are progressively encouraged as a replacement for mineral oils in lubricant industry, while enhancement of few properties like the oxidative stability aids in the efficient use of them as the base stock. A generous amount of unsaturation in vegetable oils decreases oxidative stability and improves the pour point. Hence, a compromise between these two properties (pour point and oxidative stability) is critical in vegetable oil‐based lubricant. In this regard, sesame oil (SESO) possesses high pour point, and presence of natural antioxidants in it imparts superior oxidative stability than any other vegetable oils with a higher level of unsaturation. The addition of certain synthetic antioxidants to the SESO helps in the further improvisation of its oxidative stability to suit it for lubricant purpose. In the present work, the oxidative stability of SESO blended with octyl gallate (OG), salicyl hydroxamic acid, 2,5‐di‐tert‐butyl hydroquinone (DTBHQ), and tertbutyl hydroquinone (TBHQ) are assessed using hot oil oxidation test (HOOT) and differential scanning calorimetry (DSC, ASTM E2009‐08). The results are further compared with commercially available mineral oil‐based lubricant, SAE20W40. HOOT results show that a blend of SESO + 1.5%DTBHQ + 0.5%OG possesses higher oxidative stability than other antioxidant blends with SESO. In addition, from the DSC results, it is observed that the oxidative onset temperature (OOT) for abovementioned combination (268.10°C) shows an increase of 46.6% than the value of neat SESO (182.79°C) and is nearer to SAE20W40 (277.38°C). Fourier‐transform infrared spectroscopy results show that SESO + 1.5%DTBHQ + 0.5%OG combination subjected to HOOT hampers oxidation and hence increases the oxidative stability. The tribological properties of neat and antioxidant added SESO are studied using a four‐ball tester. Quantum chemical studies are also performed for antioxidant molecules on the basis of bond dissociation energies, ionisation potential, and HOMO‐LUMO energy gap to identify the dominant antioxidant mechanisms.

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Oxidation stability of lubricating base oils

Cited by 16 publications

References 9 publications

Chemical and physical assessment of engine oils degradation and additive depletion by soot

Chemical and physical assessment of engine oils degradation and additive depletion by soot

Kinetics study of cold rolling lubricant degradation through advanced instrumental techniques

Experimental and quantum chemical investigations on the oxidative stability of sesame oil base stock with synthetic antioxidant additives

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