A Study on the Tribofilm Growth and Tribological Properties of Tribofilms Formed from Zinc Dialkyl Dithiophosphate (ZDDP) and Molybdenum Dialkyl Dithiocarbamate (MoDTC)

Lü, Renguo; Shiode, Sora; Tani, Hiroshi; Tagawa, Norio; Koganezawa, Shinji

doi:10.2474/trol.13.157

Cited by 8 publications

(7 citation statements)

References 28 publications

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“…Shi et al found that similar low friction mechanism was observed on the graphene/copper/hydroxypropyl-methylcellulose coating [26]. Additives in oil lubricants, which are also widely used in industry, generate additive-derived tribofilms on sliding surfaces due to sliding heat and high shear stress at the real contact area, resulting in high wear resistance and low friction [27][28][29][30][31][32][33][34][35]. Both systems can be reconsidered as excellent systems designed to transition to the desired state (e.g., low friction surfaces) upon the occurrence of the phenomenon to be controlled (e.g., friction).…”

Section: Introductionmentioning

confidence: 76%

Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction

Murashima,

Aono,

Umehara

et al. 2023

Tribology Online

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With the increasing demand for active friction control, we newly proposed to use dielectrophoresis to change the flow of PG-dropletcontaining PAO4 to reduce the friction coefficient. The friction result with a 1-mm roller shows 20% reduction in friction coefficient (from 0.065 to 0.052) at AC 100 V, and in situ observation exhibits that PG tracks are formed over the contact area. On the other hand, at a high bias of 1000 V, the friction coefficient increases to 0.065. In this situation, in situ observation exhibits that PG forms a horseshoeshaped track covering only the roller edges. Controlled friction tests and FEM analysis using 5-mm rollers revealed a unique behavior; a balanced bias effectively attracts the PG to the roller surface, and surface forces can resist mild dielectrophoretic forces to spread the PG across the roller surface. The present study strongly suggests the importance that the bias strength should be controlled to achieve a balance between surface force and dielectrophoretic force in order to obtain excellent lubrication conditions.

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Section: Introductionmentioning

confidence: 76%

Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction

Murashima,

Aono,

Umehara

et al. 2023

Tribology Online

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“…This highlighted the enhanced antiwear property of ZDDP when combined with MoDTC, as opposed to the increased wear observed in ZDDP alone scenario. 108 Consequently, the inclusion of MoDTC with ZDDP yields an improved antiwear performance for soft surfaces. In a similar study involving ADC12 alloy, blending of tert-butoxy-functionalized h-BN nanosheets (h-BN-TBO) with ZDDP, the introduction of the latter into the ZDDP-containing lubricant led to a remarkable improvement in the tribological properties owing to the synergistic interaction between the blend constituents.…”

Section: ■ Influence Of Supplementary Additives On Tribofilm Formatio...mentioning

confidence: 99%

“…The blending of MoDTC with ZDDP has been observed to retard ZDDP tribofilm growth owing to the competitive adsorption phenomena between ZDDP and MoDTC . In a macroscale investigation, Lu et al reported a synergistic effect when an optimal concentration of MoDTC was mixed with ZDDP, leading to the transformation of ZDDP into an antiwear zinc phosphate glass tribofilm, while MoDTC decomposed to a MoS 2 tribolayer, inducing a low coefficient of friction on the surface. − The adsorption of these low-friction MoS 2 layers in the wear scar is promoted by the generation of FeS 2 , N-containing species and phosphate layers, which collectively serve as protective layers for retaining the MoS 2 . The inclusion of MoDTC in ZDDP-containing lubricant resulted in only a marginal increase in wear compared to ZDDP alone, and this wear was still lower than that observed with the base oil .…”

Section: Influence Of Supplementary Additives On Tribofilm Formation ...mentioning

confidence: 99%

“…Interestingly, the Al matrix, away from the Si phase, exhibited lower friction followed by the formation of a thin tribofilm in the Al matrix. This highlighted the enhanced antiwear property of ZDDP when combined with MoDTC, as opposed to the increased wear observed in ZDDP alone scenario . Consequently, the inclusion of MoDTC with ZDDP yields an improved antiwear performance for soft surfaces.…”

Section: Influence Of Supplementary Additives On Tribofilm Formation ...mentioning

confidence: 99%

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Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Soni,

Gosvami

2024

Langmuir

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Zinc dialkyl dithiophosphate (ZDDP) is a key antiwear additive in lubricants that forms robust phosphate glass-based tribofilms to mitigate wear on rubbing surfaces. The quest to unravel the enigma of these antiwear film formations on sliding surfaces has persisted as an enduring mystery, despite nearly a century of fervent research. This paper presents a comprehensive review of nanotribological investigations, centering on the tribochemical decomposition of ZDDP antiwear additives. The core of the Review explores investigations conducted through the in situ AFM-based technique, which has been used to unveil the underlying stress-assisted thermal activation (SATA) mechanism behind the formation of antiwear tribofilms on diverse surfaces. A thorough analysis is presented, encompassing governing factors, such as compression, shear, and temperature, that wield influence over the intricate process of tribofilm formation. This is substantiated by a spectrum of structural and chemical characterization-based inferences. Furthermore, atomic-scale computer simulation studies are discussed that provide profound insights into tribochemical reaction mechanisms and elucidate the details of chemical processes at atomic level.

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“…The results showed that MoDTC can activate reciprocating tests. Lu [28] monitored the process of friction films formation between MoDTC and ZDDP, and proved that MoDTC accelerated the formation of ZDDP friction films. Xu [29] used Raman microscope and atomic force microscope to study the relationship between the formation and removal of MoDTC/ZDDP friction films.…”

Section: Introductionmentioning

confidence: 98%

Tribological Properties of Polymer Friction Improvers Combined with MoDTC/ZDDP at Different Temperatures

Hong

et al. 2023

Lubricants

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To expand the applications of polymer friction modifiers in low viscosity oils suitable for hybrid power systems, the tribological properties of five kinds of oil samples at different temperatures were studied, which were compounded with polymer friction modifiers Perfad XG 2500, molybdenum dialkyl dithiocarbamate (MoDTC), zinc dialkyl dithiophosphate (ZDDP). When Perfad XG 2500 is used alone, it forms a brush-like surface film at low temperatures, which can provide lower initial friction. With the rise in temperature, its antifriction effect decreases significantly, which is related to the desorption behavior of physical film. When Perfad XG 2500 is combined with MoDTC, it has the best synergistic antifriction effect, and the average friction coefficient is reduced by a maximum of 20.83% (90 °C). Its friction coefficients decrease significantly with the increase in temperature due to the dissociation process of MoDTC catalyzed by high temperature. However, there are many furrows on the worn surfaces, and the sharp features of the profiles are obvious. When Perfad XG 2500 is combined with ZDDP, it has the best synergistic anti-wear effect, and the total wear depth is reduced by 49.6%. Its worn surface is smooth and defect-free, with minimal residual strain. The friction coefficients are hardly affected by temperature, and the average friction coefficient is reduced by a maximum of 14.4% (30 °C). When Perfad XG 2500, MoDTC and ZDDP are used together, the average friction coefficient is reduced by up to 15.2% (30 °C). Its friction coefficient increases slightly with the rise in temperature. The reason for its moderate tribological performance may be related to the superficial competition of various additives.

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A Study on the Tribofilm Growth and Tribological Properties of Tribofilms Formed from Zinc Dialkyl Dithiophosphate (ZDDP) and Molybdenum Dialkyl Dithiocarbamate (MoDTC)

Cited by 8 publications

References 28 publications

Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction

Active control of Lubricant Flow Using Dielectrophoresis and Its Effect on Friction Reduction

Recent Advancements in Understanding of Growth and Properties of Antiwear Tribofilms Derived from Zinc Dialkyl Dithiophosphate Additives under Nanoscale Sliding Contacts

Tribological Properties of Polymer Friction Improvers Combined with MoDTC/ZDDP at Different Temperatures

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