Experimental simulation of chemical reactions between ZDDP tribofilms and steel surfaces during friction processes

Minfray, Clotilde; Mogne, Th. Le; Lubrecht, Antonius; Martin, Jean‐Michel

doi:10.1007/s11249-005-9012-5

Cited by 35 publications

(28 citation statements)

References 28 publications

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“…The ratio is corrected for the contributions to NBO originating from sulphate groups and carbon bound to oxygen was composed of long-chain poly(thio)phosphates, in agreement with previous work [11,29]. A potential drawback of the oscillating-load test approach is that part of the film formed at high contact pressure might be transferred to areas at low contact pressures [33,34]. However, no evidence for a possible transfer was found and the results are in agreement with results obtained with the constant-load test [11].…”

Section: Comparison Of the Constant-load And Oscillatingload Approachessupporting

confidence: 85%

“…It has been suggested that during a tribological contact similar reactions occur on the surfaces of both counterparts, starting at room temperature [11,32]. But while it has been proven that the tribofilm changes on the disc as a function of test temperature from a zinc phosphate at low temperature to a zinc polyphosphate at higher temperature [11,20,22,25,26] only very little analysis of the ball has been carried out [33,34].…”

Section: Introductionmentioning

confidence: 99%

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Pressure Dependence of ZnDTP Tribochemical Film Formation: A Combinatorial Approach

2007

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Combinatorial testing has been performed on zinc dialkyldithiophosphate (ZnDTP)-containing lubricants, to investigate the effects of contact pressure on the formation of tribochemical films. Contact pressures ranging from 25 to 500 MPa were applied in ball-on-disc tribotests with oscillating load. Both the ball and the disc were investigated by means of small-area and imaging X-ray photoelectron spectroscopy (XPS). The thickness and the composition of the reaction layer were estimated from the XPS data. The thickness of the reaction layer in the tribologically stressed areas of the ball and of the disc increased with both temperature and contact pressure. The reaction layer mainly consisted of short-chain poly(thio)phosphates, shorter chains being observed at higher contact pressures. At high pressures, the presence of a thick, high-toughness short-chain poly(thio)phosphate layer can explain the lower friction and dimensional wear coefficients observed. On the ball, similar anti-wear film formation mechanisms were observed as on the disc, zinc sulphide being deposited in the post-contact region.

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Section: Comparison Of the Constant-load And Oscillatingload Approachessupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Pressure Dependence of ZnDTP Tribochemical Film Formation: A Combinatorial Approach

2007

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“…In the process of friction, the lubricants are likely to be contaminated and oxidized to certain extent, which results in corrosion and wear of the rubbing surfaces [4,35]. ZDDP as corrosion inhibitor and antioxidant has aroused scholars' extensive interest and been widely studied; it is the generally-used lubricant additive [36].…”

Section: Corrosion and Electrochemical Testsmentioning

confidence: 99%

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Huang

et al. 2017

Friction

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Abstract:To enhance the lubricating and extreme pressure (EP) performance of base oils, two types of oil-soluble ionic liquids (ILs) with similar anion albeit dissimilar cations were synthesized. The physical properties of the prepared ILs were measured. The anticorrosion properties of ILs were assessed by conducting corrosion tests on steel discs and copper strips, which revealed the remarkable anticorrosion properties of the ILs in comparison with those of the commercial additive zinc dialkyldithiophosphate (ZDDP). The tribological properties of the two ILs as additives for poly-α-olefin-10 (PAO10) with various mass concentrations were investigated. The tribological test results indicate that these ILs as additives are capable of reducing friction and wear of sliding contacts remarkably as well as enhance the EP performance of blank PAO10. Under similar test conditions, these IL additives exhibit higher lubricating and anti-wear (AW) performances than those of ZDDP based additive package in PAO10. Subsequently, X-ray photoelectron spectroscopy (XPS) and energy dispersive spectrometer (EDS) were conducted to study the lubricating mechanism of the two ILs. The results indicate that the formation of tribochemical film plays the most crucial role in enhancing the lubricating and AW behavior of the mixture lubricants.

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“…The composition of the tribological films formed in the presence of ZnDTP is heterogeneous, with longer polyphosphate chain lengths being present in the outermost layer and a layer of shorter-chain-length polyphosphates at the bottom, which also contains zinc, iron, and some sulfur and unreacted/partially reacted additive adsorbed on the surface [8][9][10]44]. Many parameters can influence the composition and the thickness of the tribofilms.…”

Section: Comparison With the Tribochemistry Of Zndtp Filmsmentioning

confidence: 99%

Tribochemistry of Bulk Zinc Metaphosphate Glasses

et al. 2010

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Zinc polyphosphate glasses are the principal component of the antiwear tribofilms formed on steel surfaces in the presence of additives, such as zinc dialkyldithiophosphates. In this work, amorphous, zinc metaphosphate glasses have been synthesized and characterized by means of X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), elemental analysis, and X-ray photoelectron spectroscopy (XPS). Tribological tests were performed by rubbing steel balls against the zinc metaphosphate discs in a poly-aolefin (PAO) bath at room temperature. XPS was used in order to characterize the tribostressed areas on both metaphosphate discs and steel balls. A transfer film, constituted of iron and zinc polyphosphates, was formed on the contact area of the balls. This transfer film was found to reduce friction and prevent ball wear. A reduction in the relative intensities of XPS signals related to bridging-oxygen species and a binding energy shift of 0.4 eV of the P 2p toward lower values demonstrated the presence of shorter-chain-length phosphates inside the tribo-tracks on the discs. Furthermore, iron was transferred to the glass during the tribological tests. A tribochemical reaction between zinc metaphosphate and iron oxide has been proposed as an explanation for the depolymerization of the glass and the formation of iron phosphate.

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Experimental simulation of chemical reactions between ZDDP tribofilms and steel surfaces during friction processes

Cited by 35 publications

References 28 publications

Pressure Dependence of ZnDTP Tribochemical Film Formation: A Combinatorial Approach

Pressure Dependence of ZnDTP Tribochemical Film Formation: A Combinatorial Approach

Oil-soluble ionic liquids as antiwear and extreme pressure additives in poly-α-olefin for steel/steel contacts

Tribochemistry of Bulk Zinc Metaphosphate Glasses

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