Untitled

Najman, M.N.; Kasrai, M.; Bancroft, G.M.; Miller, Anne‐Frances

doi:10.1023/a:1020164127000

Cited by 50 publications

(23 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…metal-free) additives, such as organosulfur compounds [6], phosphates [6][7][8][9][10][11][12][13][14][15][16], amine phosphates [12], phosphites [11,[17][18][19], phosphorothionates [12][13][14][20][21][22][23][24][25][26], and dithiophosphates [12,21,22,24].…”

Section: Introductionmentioning

confidence: 99%

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

2009

View full text Add to dashboard Cite

Investigating the thermo-oxidative reactivity of anti-wear additives in lubricant oil solution at high temperature can significantly contribute to an understanding of the mechanism of thermal film and tribofilm formation on metal surfaces. In this study, the reactivity of triphenyl phosphorothionate (TPPT) in lubricant oil solution at high temperature (423 and 473 K) has been studied by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The results show that the TPPT molecule was highly thermally stable and did not completely decompose in oil solution even upon heating at 423 K for 168 h and at 473 K for 72 h. The degradation of the TPPT molecule, which turned out to be a first-order reaction, started taking place after 6 h at both temperatures, leading to the breakage of the P=S bond with the formation of triphenyl phosphate. During these heating experiments, no oil-insoluble compounds were detected. The oxidation of the base oil as a result of the prolonged heating demonstrated that the TPPT molecule did not effectively act as oxidation inhibitor.

show abstract

Section: Introductionmentioning

confidence: 99%

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

2009

View full text Add to dashboard Cite

show abstract

“…Even at low levels, it is enough to cover the active sites and decrease the performance of a catalyst. In traditional tribology systems, tricresyl phosphate (TCP) has been used as an anti-wear (AW) and extreme pressure (EP) additive with steel parts for the past 60 years [11][12][13][14][15][16]. It is now widely accepted that the effectiveness of TCP as an anti-wear additive is due to the chemical reaction of phosphorus with iron to form an iron phosphate film [15].…”

Section: Introductionmentioning

confidence: 99%

Deactivation Effect of Tricresyl Phosphate (TCP) on Tribochemical Decomposition of Hydrocarbon Oil on a Nascent Steel Surface

et al. 2008

View full text Add to dashboard Cite

A nascent surface has high activity to catalyze the decomposition of a lubricant under boundary lubrication conditions. To reduce the decomposition of a lubricant (multialkylated cyclopentane, MAC), tricresyl phosphate (TCP) was introduced as an additive. The tribological properties and decomposition process of lubricants on the nascent surface of bearing steel 52100 were investigated by a ball-on-disk friction tester in a vacuum chamber with a quadrupole mass spectrometer (Q-MS). The addition of TCP prolonged the induction period for decomposition of the lubricant. During the friction processes, hydrogen and gaseous hydrocarbons desorbed as tribochemical reaction products. XPS analysis revealed that the tribofilm from the additive was mainly composed of iron phosphate, which decreased the probability of generating a nascent surface, resulting in the reduction of desorption rate of gaseous products. The critical load for the mechanical activation of the decomposition correspondingly doubled.

show abstract

“…Associating these results with antifriction properties, the conclusion can be drawn that the tribofilms are composed of an adsorbed layer and a tribochemical layer, and a proper ratio of the mixtures of the adsorbed molecule and tribochemical products in the tribofilms will produce better antifriction results than a single component. As can be seen from the spectroscopy of tribofilms, there is no or only a weak pre-edge feature at approximately 2148.0 eV (the peak is the characteristic of Fe(III) phosphate according to the Refs [18,19]), which indicates that the cation in the films is mainly Fe(II) and not Fe (III).…”

Section: Xanes Spectroscopy Of Tribofilms At Different Durationsmentioning

confidence: 99%

XANES characteristics of tribofilms generated by dithiophosphate additive in water at different test temperatures and durations

Qiao

et al. 2009

Surface & Interface Analysis

View full text Add to dashboard Cite

Water-based lubricants and metal-working fluids are becoming more and more popular in modern manufacturing due to environmental concerns. Owing to the poor lubricating properties offered by pure water, additives are generally needed to improve the antiwear and extreme pressure properties. In the present work, the tribological behaviors of synthesized additives in water-based lubricants are studied for different durations and temperatures by a four-ball machine, and the worn surfaces were analyzed by scanning electron microscopy (SEM) and X-ray absorption near-edge structure (XANES) spectroscopy. It was found that the tribological properties changed with the duration and temperature, and the tribofilms mainly consisted of an adsorbed layer and a tribochemical layer. The compositions of tribofilms also changed with duration and temperature, and the different compositions of tribofilms would result in different tribological properties accordingly.

show abstract

Untitled

Cited by 50 publications

References 15 publications

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

Reactivity of Triphenyl Phosphorothionate in Lubricant Oil Solution

Deactivation Effect of Tricresyl Phosphate (TCP) on Tribochemical Decomposition of Hydrocarbon Oil on a Nascent Steel Surface

XANES characteristics of tribofilms generated by dithiophosphate additive in water at different test temperatures and durations

Contact Info

Product

Resources

About