Paper IX (ii) The Removal of Substrate Material through Thick Zinc Dithiophosphate Anti-Wear Films

Bell, J. C.; Delargy, K.M.; Seeney, A.M.

doi:10.1016/s0167-8922(08)70546-7

Cited by 58 publications

(48 citation statements)

References 11 publications

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“…Only in the center of a worn area does the photoelectron P2p signal found at 134 eV suggest the formation of P-O-P bonds. The formation of polyphosphate has been also reported by other authors [3,14,19,20] and seems thus to occur only at high temperatures and under severe wear conditions.…”

Section: Effect Of Temperaturesupporting

confidence: 75%

Surface analytical studies of surface-additive interactions, by means of in situ and combinatorial approaches

Rossi

Eglin

Piras

et al. 2004

Wear

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Section: Effect Of Temperaturesupporting

confidence: 75%

Surface analytical studies of surface-additive interactions, by means of in situ and combinatorial approaches

Rossi

Eglin

Piras

et al. 2004

Wear

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“…On the other hand, phosphorous containing additives such as ZDDP are widely used in the automotive industry as antiwear and antioxidant additives [7]. They can mitigate wear by forming a protective film, called tribofilm, on the contacting surfaces [8] and by breaking the surface oxidation cycle by decomposing peroxides and peroxy-radicals in the oil [9].…”

Section: Introductionmentioning

confidence: 99%

An in situ synchrotron XAS methodology for surface analysis under high temperature, pressure, and shear

Dorgham

Neville

Ignatyev

et al. 2017

Review of Scientific Instruments

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The complex tribochemical nature of lubricated tribological contacts is inaccessible in real time without altering their initial state. To overcome this issue, a new design of a pin-on-disc tribological apparatus was developed and combined with synchrotron X-ray absorption spectroscopy (XAS). Using the designed apparatus, it is possible to study in situ the transient decomposition reactions of various oil additives on different surfaces under a wide range of realistic operating conditions of contact pressure (1.0–3.0 GPa), temperature (25–120 °C), and sliding speed (30–3000 rpm or 0.15–15 m/s). To test the apparatus, several tribological tests were performed at different shearing times ranging from 2.5 to 60 min. These tests were carried out under helium atmosphere at a temperature of 80 °C, contact pressure of 2.2 GPa, and sliding speed of 50 rpm. The XAS experiments indicate that the zinc dialkyldithiophosphate antiwear additive decomposes in the oil to form a tribofilm on the iron surface at different reaction kinetics from the ones of the thermal film. The tribofilm composition evolves much faster than the one of the thermal film, which confirms that the formation of the tribofilm is a thermally activated process similar to the one of the thermal film but accelerated by shear. Furthermore, the results indicate that the sulfur of the formed film, whether a tribofilm or a thermal film, appears initially in the form of sulfate, with some sulfide, which under heat or shear is reduced into mainly sulfide.

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“…As demonstrated in previous works [3][4][5][6][7][8][9][10] related to the boundary lubrication regime, the friction and wear processes, in the case of conventional additives, are associated to the formation, on the sliding surfaces, of a protective tribofilm resulting from chemical reactions between additives molecules and surfaces. This action mechanism implies that the tribofilm is not immediately formed on the surfaces and the antiwear efficiency is modulated by the reactivity of the additives with the sliding materials.…”

Section: Introductionmentioning

confidence: 99%

Friction Properties of Fluorinated Carbon Nanodiscs and Nanocones

Pandorf¹,

Himmel²,

Mansot³

et al. 2010

Tribol Lett

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The tribologic properties of carbon nanodiscs and nanocones and their fluorinated derivatives are investigated and correlated to their structure and chemical composition (atomic fluorine/carbon ratio). Two families of products are studied obtained by fluorination of ill ordered and highly graphitized carbon nanodiscs and nanocones. The studies clearly point out that friction properties of the nanoparticles are strongly dependent on the structure of the initial carbonaceous compounds. Better tribologic behaviour is obtained when the initial nanoparticles structure is highly ordered (graphitized particles). In that case, an optimum of fluorination rate is put in evidence.

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Paper IX (ii) The Removal of Substrate Material through Thick Zinc Dithiophosphate Anti-Wear Films

Cited by 58 publications

References 11 publications

Surface analytical studies of surface-additive interactions, by means of in situ and combinatorial approaches

Surface analytical studies of surface-additive interactions, by means of in situ and combinatorial approaches

An in situ synchrotron XAS methodology for surface analysis under high temperature, pressure, and shear

Friction Properties of Fluorinated Carbon Nanodiscs and Nanocones

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