Surface analysis of tribofilm formed by phosphorus-nitrogen (P-N) ionic liquid in synthetic ester and water-based emulsion

Zheng, Ganlin; Ding, Tong‐Mei; Zhang, Gangqiang; Xiang, Xianzheng; Xu, Yong; Ren, Tianhui; Li, Fan; Zheng, Lei

doi:10.1016/j.triboint.2017.05.029

Cited by 21 publications

(12 citation statements)

References 32 publications

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“…Figure 6 c shows a wear surface with polished abrasion conditions. This is likely a result of the greater number of exposed CNCs that may act as an interfacial separator, not only to prevent wear but also to provide a rolling-bearing effect [ 37 , 38 , 39 , 40 ]. As such, the lowest friction and fine polishing of rolling abrasion resulted in the minimum wear volume at a CNC addition of 1.0 wt.%.…”

Section: Resultsmentioning

confidence: 99%

Tribological Properties of Oil-in-Water Emulsion with Carbon Nanocapsule Additives

et al. 2020

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An experimental investigation was performed on the coefficients of friction (COFs) and wear properties of pure water and oil-in-water (O/W) working fluids containing carbon nanocapsules (CNCs) with concentrations ranging from 0 to 1.0 wt.%. For the O/W working fluid, the ratio of oil to water was set as 6%. It was shown that for the water working fluid, the COF decreased by around 20% as the CNC content increased from 0 to 1.0 wt.%. In contrast, the wear volume increased by 50% as the CNC addition increased from 0 to 0.5 wt.%, but it fell to a value slightly lower than that achieved using only pure water (i.e., no CNCs) as the CNC content was further increased to 1.0 wt.%. For the O/W emulsion, the addition of 0.8 wt.% CNCs reduced the COF by around 30% compared to that of the emulsion with no CNCs. Overall, the results showed that while the addition of a small quantity (6%) of oil to the water working fluid had a relatively small effect on the wear performance, the addition of an appropriate quantity of CNCs (i.e., 0.8 wt.%) resulted in a significantly lower COF and an improved wear surface.

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Section: Resultsmentioning

confidence: 99%

Tribological Properties of Oil-in-Water Emulsion with Carbon Nanocapsule Additives

et al. 2020

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“…An X-ray beam was monochromatized by a fixed-exit double-crystal Si(111) monochromator, and it covered the photon region of 2,460-2,490 eV with 0.30 eV resolution. The maximum analysis depths at the K-edge were approximately 5 μm and 50 nm for FY and TEY mode, respectively [19,26]. All the spectra were collected with a step size of…”

Section: Xanes Analysismentioning

confidence: 99%

“…In addition, some important facts and viewpoints have been heeded after years of research. The tribochemical reaction of ZDDP or phosphate-containing additive could be enhanced with elevated load, interval time, speed, and temperature [18,19], indicating that frictional conditions play an important role in the lubricating effectiveness of tribofilm. Therefore, a study of the interaction between frictional conditions and the evolution of sulfur-tribofilm is necessary and important for its application in oil.…”

Section: Introductionmentioning

confidence: 99%

Friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES

et al. 2019

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The effects of friction conditions, such as rotational speed, frictional time, and applied load, on the evolution mechanism of sulfide and sulfate on the top and bottom layers of tribofilm were investigated by total electron yield (TEY) and fluorescence yield (FY) mode X-ray absorption near-edge structure (XANES) spectra in the same beam line (4B7A). The results demonstrated that the top and bottom layers of tribofilms were covered by sulfide and sulfate. The addition of dialkylpentasulfide (DPS) could form complex nonuniform tribofilm. In addition, the friction condition (speed, load, or time) has its unique role in the generation of sulfide and sulfate at a specific depth on the tribofilm surface. The enhancement of friction conditions could promote the sulfur tribochemical reaction in a comparatively large range and alter the relative intensity of sulfurization and the sulfur-oxidizing process.

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“…The results contribute to the increase in the number of aliphatic chains and active phosphorus elements in RSOPE, which increases the lubricity and strengthens the loading-carrying capacity of the W-EG. This means RSOPE can produce physical adsorption and chemical reactions film on the stainless-steel surface [19][20][21][22].…”

Section: Corrosion Resistance Propertiesmentioning

confidence: 99%

“…When the concentration was more than 0.5 wt%, PPE solution can meet the requirements of lubricating and antiwear properties. Ren et al [5] studied a P-N type ionic liquid (T672) in synthetic ester (pentaerythritol tetraoleate known as PETO) and water-based emulsion. The results showed that the improvement of tribological properties is determined by oligomeric phosphate.…”

Section: Introductionmentioning

confidence: 99%

Tribological Behavior of Plant Oil-Based Extreme Pressure Lubricant Additive in Water-Ethylene Glycol Liquid

Ding¹,

Yang²,

Xu³

et al. 2019

Journal of Renewable Materials

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A water-soluble lubricant additive (RSOPE) was prepared by esterification reaction using fatty acid from rubber seed oil. The RSOPE was added into water-ethylene glycol (W-EG) solution as lubricant additive. Dispersion stability and rheological properties were investigated. We used a four-ball tribotester to assess the lubrication performance of W-EG based fluid with the RSOPE additive. The stainless-steel surface was analyzed using scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Good dispersion stability was observed in the RSOPE/W-EG solutions. Furthermore, non-Newtonian fluid behavior at low shear rates and Newtonian fluid behavior at high shear rates was exhibited. The addition of RSOPE into water-glycol reduced the friction coefficients (COF) and wear scar diameters (WSD). The maximum nonseizure loads (PB) increased from 98 N to 752 N and the W-EG solution with RSOPE had good corrosion resistance properties. Good tribological performances for W-EG solution with RSOPE were attributed to the boundary tribofilm composed of iron oxide, iron phosphide and so on.

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Surface analysis of tribofilm formed by phosphorus-nitrogen (P-N) ionic liquid in synthetic ester and water-based emulsion

Cited by 21 publications

References 32 publications

Tribological Properties of Oil-in-Water Emulsion with Carbon Nanocapsule Additives

Tribological Properties of Oil-in-Water Emulsion with Carbon Nanocapsule Additives

Friction-condition-dependent sulfide and sulfate evolution on dialkylpentasulfide tribofilm studied by XANES

Tribological Behavior of Plant Oil-Based Extreme Pressure Lubricant Additive in Water-Ethylene Glycol Liquid

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