Tribochemistry of ZDDP and MoDDP chemisorbed films

Martin, Jean‐Michel; Mogne, Th. Le; Grossiord, C.; Palermo, Thierry

doi:10.1007/bf00173135

Cited by 43 publications

(28 citation statements)

References 14 publications

(12 reference statements)

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“…The binding energies of ZDDP elements found on the wear scar (figure 6 and table 5) show the formation of a phosphate glass [20,21], which is in agreement with the other work [24]. Detection of the S peak showed formation of sulphides whenever ZDDP was used with MoDTC or alone.…”

Section: Effect Of Modtc On Zddp Tribofilm Formationsupporting

confidence: 82%

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ZDDP and MoDTC interactions and their effect on tribological performance – tribofilm characteristics and its evolution

et al. 2006

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In this work, the interactions between two key additives in current lubricants (ZDDP and MoDTC) and the effect on tribofilm formation and tribofilm evolution under boundary lubrication are studied. The chemical and tribological characteristics of the tribofilms are probed using measurement of friction, wear and film characteristics. Tribofilms have been examined by energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS). In order to investigate the morphology of the reaction films formed, atomic force microscopy (AFM) was used. In this work, for the first time, a link between a proposed MoDTC breakdown mechanism and MoDTC tribofilm characteristics, measured on experimentally derived tribofilms, is made.

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Section: Effect Of Modtc On Zddp Tribofilm Formationsupporting

confidence: 82%

“…It is reported that MoDTC reduces friction by forming a MoS 2 -containing film on the tribological contact [3][4][5][6][7][8]. The layer-lattice structure of the molybdenum disulphide makes it possible for low friction to be achieved between the tribocouple components [9].…”

Section: Introductionmentioning

confidence: 99%

ZDDP and MoDTC interactions and their effect on tribological performance – tribofilm characteristics and its evolution

et al. 2006

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“…Experimentally, various surface analysis techniques have been used for the characterization of these tribofilms: e.g., Auger electron spectroscopy (AES) [11,12], X-ray photoelectron spectroscopy (XPS) [13][14][15] and X-ray absorption near-edge structure (XANES) spectroscopy in both area averaging and imaging modes [16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Steel Hardness on the Performance of ZDDP Antiwear Films: A Multi-Technique Approach

Pereira

Kasrai

et al. 2008

Tribol Lett

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X-ray absorption near-edge structure (XANES) analysis has been used to characterize the chemistry of antiwear films formed in a mineral base oil containing a zinc dialkyl dithiophosphate (ZDDP) additive. These films were formed by rubbing the AISI 1095 steel samples under a reciprocating boundary contact. The steel samples were tempered to produce different Vickers hardness values. The phosphorus L-edge XANES spectra show that these films differ slightly in their chemical nature, with longer chain polyphosphates being formed on samples with higher hardness value. The surface morphology of the films was investigated using Atomic force microscopy (AFM) and the film thickness was probed by Focussed ion beam and Scanning electron microscopy (FIB/SEM) techniques. Furthermore, the nanomechanical properties of these antiwear films were investigated by nanoindentation methods. Tribological measurements of the coefficient of friction (l) and wear scar width (WSW) indicate that the poorest antiwear film was formed on the softest substrate, which exhibited the largest WSW and the highest average l. FIB/ SEM images show that the thicknesses of the antiwear pads and the degree of damage on the substrates both change with the hardness value of the samples.

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“…11, the EDL is not shown and discussed here. The above hypothesis is formulated on the basis of the knowledge, premises, and predictions [12][13][14][15]. Namely, a short-chain-molecule sublayer just off the metal surface can be the product of a ZDDP reaction with iron (steel).…”

Section: Discussion and Interpretation Of The Resultsmentioning

confidence: 99%

“…3) shows an experimental set-up that consists of: the housing of an oil reservoir (chamber) (1); a seal seating-a metal ring (2); the lip seal tested (3); an insulator (4); the oil tested (5); an air bearing (6); the sensor of a torquemeter (7); an electric motor (8); a steel shaft (9) earthed through the carbon brushes; a microprocessor-based system for controlling the angular velocity n and for measuring the braking torque M b of the shaft and temperature T of oil (10); a standard capacitor C s (11); an electrometer for measuring the ring potential U e (12); a computer (13); a DC power supply U DC (14); and an oil heater (15). The chamber (1) was filled with the oil (5) up to a geometrical axis of the rotating shaft (9).…”

Section: Experimental Set-upmentioning

confidence: 99%

Base Oil and Its Blends with ZDDP and Their Effect on Tribocharging, Braking Torque and Electrical Double Layers in a Friction Junction

Gajewski

Głogowski

2010

Tribol Lett

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The paper presents the results of experiments on tribocharging of a blend of mineral-base oil and different zinc dialkyldithiophosphate (ZDDP) contents in a friction junction. A friction junction is constituted by a rotating shaft, a film of pure base oil, or its blend with the ZDDP, and a rotary lip seal, which is the interfacial system as a whole. Experiments were carried out on the specially built experimental facility to be a simplified model of an engine's crankcase (or sump) in whose interior an earthed metal shaft rotated at given angular velocities. Electric potential of a stiffening ring of a lip seal, which is a measure of tribocharging, was measured directly with an electrometer. The stiffening ring's potential is induced by charge in the film of pure base oil or the ZDDP-oil blend and is a function of the oil temperature for different angular shaft velocities and the ZDDP contents. The potential is presented in the form of some characteristics. Also the effects of an external DC electric field on the braking torque of the rotating steel shaft were examined for a range of oil temperatures, angular velocities, and ZDDP contents, and here the torque is presented for one temperature and different DC voltages of both polarities. An analysis of the research results obtained permitted us to show how the ZDDP content in a blend with the base oil tested, angular velocity, and oil temperature could affect tribocharging in the interfacial systems: the rotating shaft-oil and oil-lip seal, as well as the whole oil film in between and both electrical double layers (EDLs) at the surfaces of a shaft and of a lip of a rotary lip seal in the friction junction.

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Tribochemistry of ZDDP and MoDDP chemisorbed films

Cited by 43 publications

References 14 publications

ZDDP and MoDTC interactions and their effect on tribological performance – tribofilm characteristics and its evolution

ZDDP and MoDTC interactions and their effect on tribological performance – tribofilm characteristics and its evolution

The Effect of Steel Hardness on the Performance of ZDDP Antiwear Films: A Multi-Technique Approach

Base Oil and Its Blends with ZDDP and Their Effect on Tribocharging, Braking Torque and Electrical Double Layers in a Friction Junction

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