Application of soft X-ray absorption spectroscopy in chemical characterization of antiwear films generated by ZDDP Part I: the effects of physical parameters

Yin, Zhanfeng; Kasrai, M.; Fuller, Marina L. Suominen; Bancroft, G.M.; Fyfe, K.; Tan, K. H.

doi:10.1016/s0043-1648(96)07272-9

Cited by 234 publications

(184 citation statements)

References 53 publications

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“…The general conditions is that there is a viscous layer of physically -adsorbed additive on the top layer of the tribofilm which can be easily removed by means of solvents and washing. Underneath this viscous layer, there is a chemically adsorbed layer of amorphous zinc and iron polyphosphates with different chain lengths [3,[24][25][26]. The ZDDP tribofilm has a layered structure with different chain lengths at different positions in the layer [24,26]; shorter chain polyphosphate layers are present at the bottom adjacent to the substrate interlinked with the iron oxide.…”

Section: Chemistry Of Zddp Tribofilmmentioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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Understanding the true interfacial mechanisms involved in the growth of tribofilms generated by Zinc Dialkyl Dithiophosphate (ZDDP) is important because it is the most widely used antiwear additive and there is legislative pressure to find efficient environmentally-friendly replacements. The main focus of this study is to investigate the durability of the ZDDP tribofilm and correlate it to the chemical and physical properties of the glassy polyphosphates.A novel experimental method has been developed to study the effect of lubricant temperature and contact load on tribofilm growth and durability. Results show that physical parameters such as temperature and pressure significantly influence the tribofilm durability. XPS analyses were carried out before suspending the test and after changing the oil to assess the difference in chemical structure of the tribofilm before and after stopping the test. The chemical analyses suggest that there are different chemical properties across the thickness of the tribofilm and these determine the durability characteristics.

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Section: Chemistry Of Zddp Tribofilmmentioning

confidence: 99%

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

Parsaeian

Ghanbarzadeh

Eijk

et al. 2017

Applied Surface Science

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“…The above results indicate that the active elements (such as S, P, Zn, and N) are likely to react with the surfaces of sliding pairs to form inorganic compounds of higher toughness. Numerous studies have established that the lubricating mechanism of ZDDP can be attributed to the formation of tribochemical film by S, P, and Zn [4,36,41]. Therefore, it is deduced that the effective lubricating performance of P 888S S P and N 88816 can be attributed to the tribochemical reactions in the process of friction.…”

Section: Xps Spectra Of Wear Scar Surfacesmentioning

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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“…A lot of investigations have been conducted to evaluate the performances of additive mixtures and to determine the composition of associated tribofilms. Several factors were identified as playing a role: additive structure [1,2], additives concentration [3][4][5][6], base oil nature [7,8], …, or combinations of these parameters. A detailed review on published information on that topic was written by Willermet [9].…”

Section: Introductionmentioning

confidence: 99%

“…A detailed review on published information on that topic was written by Willermet [9]. Non-chemical parameters such as characteristics of the solid antagonists (hardness, roughness) or test conditions (load, temperature, sliding speed) [3,10] also might influence the additive interactions.…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of MoDTC and ZDTP on Frictional Behaviour of Tribofilms at the Nanometer Scale

et al. 2004

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The layered structure and the rheological properties of anti-wear films generated in a rolling/sliding contact from lubricants containing zinc dialkyldithiophosphate (ZDTP) and/or molybdenum dialkyldithiocarbamate (MoDTC) additives have been studied by dynamic nanoindentation experiments coupled with a simple modelling of the stiffness measurements. Local nano-friction experiments were conducted with the same device in order to determine the evolution of the friction coefficient as a function of the applied pressure for the different lubricant formulations. For the MoDTC film, the applied pressure in the friction test remains low (<0.5 GPa) and the apparent friction coefficient is high (µ>0.4). For the tribofilms containing MoDTC together with ZDTP, which permits the applied pressure to increase up to a few GPa through some accommodation process, a very low friction domain appears (0.01<µ<0.05), located a few nanometers below the surface of the tribofilm. This low friction coefficient is attributed to the presence of MoS 2 planes sliding over each other in a favourable configuration obtained when the pressure is sufficiently high, which is made possible by the presence of ZDTP.

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Application of soft X-ray absorption spectroscopy in chemical characterization of antiwear films generated by ZDDP Part I: the effects of physical parameters

Cited by 234 publications

References 53 publications

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

A new insight into the interfacial mechanisms of the tribofilm formed by zinc dialkyl dithiophosphate

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

Synergistic Effects of MoDTC and ZDTP on Frictional Behaviour of Tribofilms at the Nanometer Scale

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