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Lubricants based on mineral oil are in use for various application but they are not environmental friendly. Vegetable oils are increasingly used as lubricant base oils, in the context of environmental regulations and conservation of nature as they are biodegradable and environmental friendly. The one major disadvantage with them is their limited oxidative stability. In the present investigation, the effect of oxidation on the tribological performance of groundnut and palm oils were evaluated by subjecting these oils to accelerated ageing in a dark oven at elevated temperature. The samples were collected at regular intervals and were analyzed for the changes in the properties of viscosity, percentage of free fatty acid and peroxide number and were compared to fresh oils samples and further tibological properties of these samples were evaluated using four ball tester. Observed changes in the wear scar diameter and other physicochemical properties were linked to destruction of triglyceride and subsequent formation of peroxides due to the oxidation of the test oils during the ageing. The difference in the wear properties of groundnut oil to palm oil was accounted for relatively its high content of polyunsaturated fatty acids and its susceptibility to undergo oxidation in comparison to the latter.
Lubricants based on mineral oil are in use for various application but they are not environmental friendly. Vegetable oils are increasingly used as lubricant base oils, in the context of environmental regulations and conservation of nature as they are biodegradable and environmental friendly. The one major disadvantage with them is their limited oxidative stability. In the present investigation, the effect of oxidation on the tribological performance of groundnut and palm oils were evaluated by subjecting these oils to accelerated ageing in a dark oven at elevated temperature. The samples were collected at regular intervals and were analyzed for the changes in the properties of viscosity, percentage of free fatty acid and peroxide number and were compared to fresh oils samples and further tibological properties of these samples were evaluated using four ball tester. Observed changes in the wear scar diameter and other physicochemical properties were linked to destruction of triglyceride and subsequent formation of peroxides due to the oxidation of the test oils during the ageing. The difference in the wear properties of groundnut oil to palm oil was accounted for relatively its high content of polyunsaturated fatty acids and its susceptibility to undergo oxidation in comparison to the latter.
Palavras-chave
Vegetable oils; Biodegradable lubricants; Oxidation; Four ball tester.
Vegetable oils; Biodegradable lubricants; Oxidation; Four ball tester.
Como citar
Mannekote, Jagadeesh K.;
Kailas, Satish V..
THE EFFECT OF OXIDATION ON THE TRIBOLOGICAL PERFORMANCE OF FEW VEGETABLE OILS
,
p. 511-519.
In: First International Brazil Conference on Tribology TriboBr-2010 and 2nd Internacional Tribology Symposium of IFToMM,
Rio de Janeiro,
2010.
ISSN: -
, DOI 10.5151/5463-5463-17319
