Booster effect of fatty amine on friction reduction performance of Mo-based additives

This paper investigates the boosting effect on friction reduction performance of a fatty triamine (AM) when used as a third organic additive to base oil containing molybdenum-based additives and ZDDP for different tribopairs. The addition of the AM gives an unreached friction level under boundary lu...

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Bibliographic Details
Published in:Tribology international 2018-03, Vol.119 (-), p.600-607
Main Authors: De Barros Bouchet, M.I., Martin, J.M., Oumahi, C., Gorbatchev, O., Afanasiev, P., Geantet, C., Iovine, R., Thiebaut, B., Heau, C.
Format: Article
Language:English
Subjects:
Additives
Boundary lubrication
Catalysis
Chemical Sciences
DLC coatings
Environment and Society
Environmental Sciences
Friction
Friction reduction
Lubrication
Molybdenum
Molybdenum disulfide
Molybdenum-based additives
Organic additives
Sheets
Steel
Steel structures
Tribochemistry
Tribology
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Summary:This paper investigates the boosting effect on friction reduction performance of a fatty triamine (AM) when used as a third organic additive to base oil containing molybdenum-based additives and ZDDP for different tribopairs. The addition of the AM gives an unreached friction level under boundary lubrication with organic molybdate and ZDDP for steel. The structure of the tribofilm obtained with ternary mixture composed of stoichiometric MoS2 long sheets located on top surface and aligned in the sliding direction could be at the origin of this remarkable behavior. Finally, a tribochemical action mechanism is proposed to describe the functionality of AM in boosting the formation of long MoS2 lamellar sheets. •Booster impact of a fatty amine on friction reduction performance of Mo-based additives for different tribopairs.•The neat lubricant additives and mixtures have been analyzed by XPS.•Fatty amine gives unreached friction level under boundary lubrication conditions with organic molybdate and ZDDP additives.•Mechanism of friction reduction could be due to the formation of long MoS2 sheets on the top surface of the tribofilm.•Novel tribochemical action mechanism is discussed for the fatty amine when added to organic molybdate and ZDDP additives.
ISSN:0301-679X
1879-2464
DOI:10.1016/j.triboint.2017.11.039