Interpretation of experiments on ZDDP anti-wear films through pressure-induced cross-linking

We review a recently developed molecular-level theory for the formation and functionality of zinc dialkyldithiophosphate anti-wear films [N. J. Mosey, M. H. Müser and T. K. Woo, Science 307 (2005) 1612]. This theory is based on the idea that pressure-induced cross-linking leads to chemically connect...

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Bibliographic Details
Published in:Tribology letters 2006-11, Vol.24 (2), p.105-114
Main Authors: Mosey, N.J., Woo, T.K., Kasrai, M., Norton, P.R., Bancroft, G.M., Müser, M.H.
Format: Article
Language:English
Subjects:
Additives
Antiwear additives
Contact pressure
Crosslinking
Mechanical properties
Organic chemistry
Tribology
Wear resistance
Zinc dialkyldithiophosphates
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Summary:We review a recently developed molecular-level theory for the formation and functionality of zinc dialkyldithiophosphate anti-wear films [N. J. Mosey, M. H. Müser and T. K. Woo, Science 307 (2005) 1612]. This theory is based on the idea that pressure-induced cross-linking leads to chemically connected networks. The formation of cross-links modifies the mechanical properties of the films such that wear inhibition may be enhanced. Furthermore, the networks remain intact upon release of the pressure, which resists flow of the film out of the contact area. The ability of the theory to account for a diverse body of experimental data related to anti-wear additives and films is discussed. Routes towards the development of new AW additives are also suggested on the basis of the theory.
ISSN:1023-8883
1573-2711
DOI:10.1007/s11249-006-9040-9