Journal ArticleDOI
Effects of hydroperoxides on wear as measured in four-ball wear tests
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TLDR
In this article, four-ball wear studies have demonstrated that hydroperoxides formed by oil oxidation can greatly increase wear of rubbing steel parts, while peroxides have no effect on the wear of steel parts.Abstract:
Four-ball wear studies have demonstrated that hydroperoxides formed by oil oxidation can greatly increase wear of rubbing steel parts. Peroxides, in contrast, have no effect on the wear of steel parts. Engine oil components, including the antiwear additive type, the detergent, the dispersant, and the base oil, as well as the type of steel, can all influence the magnitude of the prowear effect of hydroperoxides. Surface analyses by SEM, EDAX, and XRF showed hydroperoxides reduced the surface coating formed by antiwear additives. Wear tests on blends containing potential oil additive reaction products demonstrated that none caused the high wear observed with hydroperoxides. Presented at the 46th Annual Meeting in Montreal, Quebec, Canada April 29–May 2, 1991read more
Citations
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Journal ArticleDOI
The History and Mechanisms of ZDDP
TL;DR: In this paper, the authors present a review of the mechanisms of action of the zinc dialkyldithophosphate (ZDDP) additive, concluding that we now know a great deal about the properties and morphology of ZDDP antiwear films, but still relatively little about the reaction pathways that lead to the formation or about the kinetics of ZDP film generation and removal.
Journal ArticleDOI
Vegetable oil-based lubricants—A review of oxidation
N.J. Fox,Gwidon Stachowiak +1 more
TL;DR: In this paper, the basic mechanism of vegetable oil autoxidation is presented, along with methods used to monitor and analyse the products of oxidation, and the potential impact of such oxidation products on lubrication performance is discussed.
Journal ArticleDOI
Mechanisms of antiwear tribofilm growth revealed in situ by single-asperity sliding contacts
Nitya Nand Gosvami,J.A. Bares,Filippo Mangolini,Andrew R. Konicek,Dalia G. Yablon,Robert W. Carpick +5 more
TL;DR: Atomic force microscopy monitoring in ZDDP-containing lubricant base stock at elevated temperatures monitored the growth and properties of the tribofilms in situ in well-defined single-asperity sliding nanocontacts, highlighting the critical role of stress and thermal activation.
Journal ArticleDOI
Application of soft X-ray absorption spectroscopy in chemical characterization of antiwear films generated by ZDDP Part I: the effects of physical parameters
TL;DR: In this paper, the effects of physical parameters on the composition and mechanism of anti-wear film formation are discussed, and a new mechanism for anti-wear film formation is proposed based on the above information.
Journal ArticleDOI
Oxidative stability of biodiesel: Causes, effects and prevention
TL;DR: In this paper, a comprehensive analysis of biodiesel oxidation is provided for greater understanding to eradicate the disadvantages associated with the utilisation of the biodiesel and the implications of oxidation on fuel properties, lubricity, performance and emission.
References
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Journal ArticleDOI
The role of hydroperoxides in engine wear and the effect of zinc dialkyldithiophosphates
J. J. Habeeb,W. H. Stover +1 more
TL;DR: In this article, the value train wear was examined in a motored 2.3 l engine similar to that wed in the Sequence V-D test, where model hydroperoxides were added to the crankcase oil to simulate used oil.
The role of hydroperoxides in engine wear and the effect of zinc dialkyldithiophosphates
J. J. Habeeb,W. H. Stover +1 more
TL;DR: Role des hydroperoxydes dans l'usure des moteurs et effets des dialkyldithiophosphates de zinc de zinc as discussed by the authors.
Journal ArticleDOI
The Effects of Antioxidant Reactions on the Wear Behavior of a Zinc Dialkyldithiophosphate
TL;DR: In this paper, the wear behavior of a synthetic hydrocarbon bare oil as a function of time and concentration of added zinc di-n-octyldithiophosphate, ZDTP, has been carried out utilizing the 4-ball apparatus.
Journal ArticleDOI
Lubricant Degradation and Wear V. Reaction Products of a Zinc Dialkyldithiophosphate and Peroxy Radicals
P. A. Willermet,S. K. Kandah +1 more
TL;DR: In this paper, it was shown that reaction of zinc di-n-octyldithiophosphate with peroxy radicals in laboratory experiments led to products which were ineffective as anti-wear agents.
Journal ArticleDOI
Effects of Organic Molybdenum Compounds on the Friction and Wear Observed with ZDP-Containing Lubricant Blends
TL;DR: Combining an organic molybdenum compound with a zinc dialkyl dithiophosphate (ZDP) antiwear additive can significantly reduce kinetic friction at loads in the antiwear regime as determined in laboratory, 4-ball wear tests as discussed by the authors.