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The impact of organic friction modifiers on engine oil tribofilms

The impact of organic friction modifiers on engine oil tribofilms
The impact of organic friction modifiers on engine oil tribofilms
Organic friction modifiers (OFMs) are important additives in the lubrication of machines and especially of car engines where performance improvements are constantly sought-after. Together with zinc dialkyldithiophosphates (ZDDPs) antiwear additives, OFMs have a predominant impact on the tribological behaviour of the lubricant. In the current study, the influence of OFMs on the generation, tribological properties and chemistry of ZDDP tribofilms has been investigated by combining tribological experiments (MTM) with in-situ film thickness measurements through optical interference imaging (SLIM), Alicona profilometry and X-ray photoelectron spectroscopy. OFMs and antiwear additives have been found to competitively react/adsorb on the rubbing ferrous substrates in a tribological contact. The formation and removal (through wear) of tribofilms are dynamic processes which result from the simultaneous interaction of these two additives with the surface of the wear track. By carefully selecting the chemistry of OFMs, the formulator can achieve lubricants that generate ZDDP antiwear films of optimum thickness, morphology and friction according to the application-specific requirements.
organic friction modifiers, tribofilm, zddp, friction, boundary lubrication, xps
2046-2069
4278-4285
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Alghawel, Husam
af226a61-237d-451e-9db9-96a4e010a4e9
Suen, Andrew
29d43cd7-5064-4e2c-9e5b-d809ddc7bbc2
Nelson, Kenneth
18c486af-b7f7-4f16-bcd4-aa67035eb812
Ratoi, Monica
cfeffe10-31ca-4630-8399-232c4bc2beff
Niste, Vlad
dc4260f3-a934-47e5-b612-da50e0e985da
Alghawel, Husam
af226a61-237d-451e-9db9-96a4e010a4e9
Suen, Andrew
29d43cd7-5064-4e2c-9e5b-d809ddc7bbc2
Nelson, Kenneth
18c486af-b7f7-4f16-bcd4-aa67035eb812

Ratoi, Monica, Niste, Vlad, Alghawel, Husam, Suen, Andrew and Nelson, Kenneth (2014) The impact of organic friction modifiers on engine oil tribofilms. [in special issue: Web-Themed Issue on Tribology] RSC Advances, 4 (9), 4278-4285. (doi:10.1039/C3RA46403B).

Record type: Article

Abstract

Organic friction modifiers (OFMs) are important additives in the lubrication of machines and especially of car engines where performance improvements are constantly sought-after. Together with zinc dialkyldithiophosphates (ZDDPs) antiwear additives, OFMs have a predominant impact on the tribological behaviour of the lubricant. In the current study, the influence of OFMs on the generation, tribological properties and chemistry of ZDDP tribofilms has been investigated by combining tribological experiments (MTM) with in-situ film thickness measurements through optical interference imaging (SLIM), Alicona profilometry and X-ray photoelectron spectroscopy. OFMs and antiwear additives have been found to competitively react/adsorb on the rubbing ferrous substrates in a tribological contact. The formation and removal (through wear) of tribofilms are dynamic processes which result from the simultaneous interaction of these two additives with the surface of the wear track. By carefully selecting the chemistry of OFMs, the formulator can achieve lubricants that generate ZDDP antiwear films of optimum thickness, morphology and friction according to the application-specific requirements.

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e-pub ahead of print date: 2014
Published date: 2014
Venue - Dates: World Tribology Congress 2013, 2013-09-08 - 2013-09-13
Keywords: organic friction modifiers, tribofilm, zddp, friction, boundary lubrication, xps
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 353217
URI: http://eprints.soton.ac.uk/id/eprint/353217
ISSN: 2046-2069
PURE UUID: e52f642e-344c-4b8b-867e-f3c84b51c26b
ORCID for Monica Ratoi: ORCID iD orcid.org/0000-0001-8400-3054

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Date deposited: 03 Jun 2013 08:57
Last modified: 15 Mar 2024 03:35

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Contributors

Author: Monica Ratoi ORCID iD
Author: Vlad Niste
Author: Husam Alghawel
Author: Andrew Suen
Author: Kenneth Nelson

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