Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 83: Issue 1
Description of the O2pressure influence on the oxidation time of motor oils
Authors:
R Riesen Mettler-Toledo GmbH Schwarzenbach Switzerland CH-8603 Sonnenbergstrasse 74 Schwarzenbach Switzerland CH-8603 Sonnenbergstrasse 74

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J Schawe Mettler-Toledo GmbH Schwarzenbach Switzerland CH-8603 Sonnenbergstrasse 74 Schwarzenbach Switzerland CH-8603 Sonnenbergstrasse 74

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Pages:
157–161
Online Publication Date:
10 Mar 2006
Publication Date:
08 Jan 2006
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-005-7053-5
Keywords:
engine oils; oxidation induction time (OIT); oxidation stability; oxygen pressure influence
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Abstract  

A characteristic index for the oxidation stability this is the oxidation induction time (OIT) which is defined by the time between the start of oxygen exposure and the onset of oxidation. Pressure DSC is required to increase oxygen concentration in order to achieve faster reactions at lower temperatures. OIT measurements of reference engine oils have been used to study the influence of oxygen pressure in the range from 0.1 to 10 MPa. A power law relationship was derived to describe this correlation between OIT and oxygen pressure. From this a quantitation factor is proposed to represent the influence of stabilizer. The exponent describes the sensitivity of the oxidation reaction of the oil towards the oxygen pressure and the term 'inherent stability' is proposed for that.. This relationship characterizes in more details the oxidation behavior. Extrapolation to higher pressures indicates, that the stabilization effects of additives can be overcome by the inherent stability. This signifies, that the ranking of the oils can be affected by the oxygen pressure.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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