Antiwear Film Formation by ZnDTP, Detergent, and Dispersant Components of Passenger Car Motor Oils—Part II: Effects of Low-Molecular-Weight Dispersant on Film Formation

Roby, S. H.; Yamaguchi, E. S.; Francisco, M. M.; Ruelas, Samantha

doi:10.1080/05698190490494868

Cited by 13 publications

(2 citation statements)

References 4 publications

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“…Other than surface characterization of AW films, another ''hot'' research spot is the study on additive interactions between ZDDPs and other additives such as detergents, dispersants and molybdenum dithiophosphates (MoDTCs) [28][29][30][31][32][33]. The fundamental understanding of the reactions between the ZDDPs alone with metallic surfaces is of great importance to the binary additive systems or the formulated package.…”

Section: Introductionmentioning

confidence: 99%

Studies on ZDDP Anti-Wear Films Formed Under Different Conditions by XANES Spectroscopy, Atomic Force Microscopy and 31P NMR

Pereira

Kasrai

et al. 2007

Tribol Lett

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Antiwear (AW) films, generated from a mineral base oil containing a zinc dialkyl dithiophosphate (ZDDP) additive, were studied as a function of formation temperature, load and rubbing time. The surface morphology of these films was investigated using atomic force microscopy (AFM), and surface roughness calculated for the observed differing surface morphologies. The morphology of the films is heterogeneous for all the tested conditions, but the surface roughness is dependent on the rubbing condition. X-ray absorption near edge structure (XANES) spectroscopy has been used to characterize the chemistry of these films, and the intensity of the phosphorus K-edge was also used to monitor their thickness. The thickness of these films is in the range of 10-90 nm depending on the running conditions. Phosphorus L-edge spectra show that these films have a similar chemical nature with variable polyphosphate chain-lengths. 31P NMR was used to study the decomposition of ZDDP in the residual oils. The spectra show that the primary and secondary ZDDP react differently under the various conditions. The tribological characteristics of these AW films were probed by measuring the coefficients of friction (l) and the wear scar width (WSW) of the counter faces. l is highly related to the applied load and the results of WSW measurements show that the wear performance is related to all the tested parameters, temperature, load and rubbing time.

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Section: Introductionmentioning

confidence: 99%

Studies on ZDDP Anti-Wear Films Formed Under Different Conditions by XANES Spectroscopy, Atomic Force Microscopy and 31P NMR

Pereira

Kasrai

et al. 2007

Tribol Lett

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“…A competitive adsorption of ZDDPs and detergents limits effective interaction of ZDDP with metallic surface, retarding the efficacy of ZDDP during friction. 38 In particular, such calcium sulfonates deplete the sulphur within tribofilm and calcium phenates make polyphosphate shortening, which gives rise to poor wear behaviour only if its concentration is in excess of 2 wt.%. 39 Also, they helps to suspend carbon soot, alleviating the deleterious effects of carbon agglomeration and thereby wear decrement.…”

Section: Discussionmentioning

confidence: 99%

Unveiling oil-additive/surface hierarchy at real ring-liner contact

Wan

Xia

Pham

et al. 2019

Surfaces and Interfaces

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Zinc-dialkyldithiophosphate (ZDDP) additive in oil has been extensively reported to form a protective tribofilm between the moving components of engine for preventing wear. In this study, surface and interface characterizations were conducted on real piston ring/cylinder liner contacts, the interacting mechanism between oil-additive and solid surfaces under realistic mechanical and thermal conditions was predicted according to the identification of the chemical composition and structure of the tribofilm. The results demonstrate the interesting laminated hierarchy of tribofilm. This tribofilm is composed mainly of dense carbon precipitation at the top region and a thinner polyphosphate intermediate layer in contact with deformed iron oxide substrate on the cylinder liner. The depletion of polyphosphate compounds and competitive growth of solid carbon in term of lubricant's degradation was speculated. These significant findings help manufacturer to understand possible tribochemical processes occurring in the real tribosystem from the practical view, and in particular inspire researchers to develop the new strategy to improve capability and efficiency of oil-additive at sliding contacts.

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Evaluation of lubricating-oil performance and emissions with lubricant formulations using ZDDP as the selected additive in GDI engines: a simultaneous study of VOCs and soot in oil

Kang

2021

J Mech Sci Technol

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Antiwear Film Formation by ZnDTP, Detergent, and Dispersant Components of Passenger Car Motor Oils—Part II: Effects of Low-Molecular-Weight Dispersant on Film Formation

Cited by 13 publications

References 4 publications

Studies on ZDDP Anti-Wear Films Formed Under Different Conditions by XANES Spectroscopy, Atomic Force Microscopy and 31P NMR

Studies on ZDDP Anti-Wear Films Formed Under Different Conditions by XANES Spectroscopy, Atomic Force Microscopy and 31P NMR

Unveiling oil-additive/surface hierarchy at real ring-liner contact

Evaluation of lubricating-oil performance and emissions with lubricant formulations using ZDDP as the selected additive in GDI engines: a simultaneous study of VOCs and soot in oil

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