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Tribology Transactions Volume 46, 2003 - Issue 3
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Original Articles

Friction-Enhancing Properties of ZDDP Antiwear Additive: Part II—Influence of ZDDP Reaction Films on EHD Lubrication

Lisa J. Taylor Imperial College, Department of Mechanical Engineering, London, SW7 2BX, United Kingdom
&
Hugh A. Spikes Imperial College, Department of Mechanical Engineering, London, SW7 2BX, United Kingdom
Pages 310-314 | Published online: 25 Mar 2008
 
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Abstract

In a companion paper, Part I, it was shown that the friction enhancement produced in mixed lubrication conditions by ZDDP reaction films is not due to surface roughening as has previously been supposed. Instead, optical measurement of elastohydrodynamic film thickness shows that the presence of a ZDDP reaction layer inhibits the entrainment of liquid lubricant into rolling/sliding contacts. As a result, these contacts operate in boundary lubrication, with consequently high friction, up to higher speeds than would otherwise be the case and the attainment of full film elastohydrodynamic lubrication is also postponed. Possible mechanisms by which ZDDP reaction films might inhibit fluid entrainment are discussed.

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Related Research Data

A thermodynamic approach to viscosity
Source: Informa UK Limited
Tribological Behavior of Film Forming Organosilane/-Siloxane Oil Additives: Film Characterization and Influences on Lubrication
Source: Springer Science and Business Media LLC
Application of soft X-ray absorption spectroscopy in chemical characterization of antiwear films generated by ZDDP Part I: the effects of physical parameters
Source: Elsevier BV
Evaluation of Lubricants Using Optical Elastohydrodynamics
Source: Informa UK Limited
Apparent Slip of Newtonian Fluids Past Adsorbed Polymer Layers
Source: American Chemical Society (ACS)
Effect of base oil polarity on the micropitting behaviour in rolling-sliding contacts
Source: Wiley
The Development of a Spacer Layer Imaging Method (SLIM) for Mapping Elastohydrodynamic Contacts
Source: Informa UK Limited
In situ synchrotron XAS study of the decomposition kinetics of ZDDP triboreactive interfaces
Source: Royal Society of Chemistry
Nanomechanical properties of films derived from zinc dialkyldithiophosphate
Source: Springer Science and Business Media LLC
Relationship between mechanical properties and structures of zinc dithiophosphate anti–wear films
Source: HAL CCSD
Film Thickness and Friction of ZDDP Tribofilms
Source: Springer Science and Business Media LLC
Friction and Wear Behavior of Zinc Dialkyldithiophosphate Additive
Source: Informa UK Limited

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