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Wang J.,CAS Lanzhou Institute of Chemical Physics | Wang J.,University of Chinese Academy of Sciences | Wang J.,Navy Logistical Technical Equipment Research Institute | Li C.,Navy Logistical Technical Equipment Research Institute | And 2 more authors.
Tribology Letters | Year: 2011

A water-soluble boron (B)-containing thiophosphite derivative (BTP) was synthesized, and its tribological, anticorrosion, and antirust properties as an additive for the base liquid of water-glycol hydraulic fluid were evaluated in detail. The results of tests demonstrated that BTP is indeed a high-performance and multifunctional water-soluble lubricant additive that was able to remarkably improve the extreme pressure, friction-reducing, antiwear, anticorrosion, and rust-inhibiting properties of the base liquid when added at a low adding concentration (<3 wt%). Based on a performance comparison of BTP and thiophosphite (TP), whose chemical structure is similar to that of BTP but without B, a number of primary conclusions were drawn. The B element existing as alkanolamine borate group could greatly improve the extreme pressure, antiwear, and antirust performance of BTP, especially the antirust performance, but had only a small effect on the friction-reducing and anticorrosion properties. Based on characterizations and analyses of the worn surfaces, we propose that the antiwear mechanism consists of the prepared compound BTP reacting with the steel surface during the friction process to generate a protective film mainly composed of phosphate, sulfide, sulfate, organic amine, and B 2O 3. © 2011 Springer Science+Business Media, LLC.


Wang J.,CAS Lanzhou Institute of Chemical Physics | Wang J.,University of Chinese Academy of Sciences | Wang J.,Navy Logistical Technical Equipment Research Institute | Li C.,Navy Logistical Technical Equipment Research Institute | And 2 more authors.
Lubrication Science | Year: 2012

The tribological behaviour of poly(sodium 4-styrenesulphonate) (PSS) as additive in the base fluid of water-glycol hydraulic fluid was evaluated with four-ball machine and Optimol SRV-IV (Optimol Instruments, Munich, Germany) oscillating friction and wear tester, and its viscosity-enhancing performance was also investigated. The results show that PSS exhibits excellent friction-reducing and anti-wear properties in the base fluid and can significantly improve the latter's welding load and viscosity. The worn surfaces were characterised by scanning electron microscope and X-ray photoelectron spectroscopy. The analytical results of typical elements on the worn surfaces demonstrate that PSS molecules adsorb on the rubbing surface and form a stable chemically absorbed film through the interactions between the sulphonate anions and surface metallic atoms during the sliding process, which contributed to improve the tribological properties of the base fluid. © 2012 John Wiley & Sons, Ltd.


Wang J.,CAS Lanzhou Institute of Chemical Physics | Wang J.,University of Chinese Academy of Sciences | Xu C.,CAS Lanzhou Institute of Chemical Physics | Wang J.,Navy Logistical Technical Equipment Research Institute | And 3 more authors.
Tribology Transactions | Year: 2013

Three S-alkyl-N,N-dicarboxymethyl dithiocarbamates with different alkyl chain lengths were synthesized and their tribological properties as additives for a water-glycol hydraulic fluid were evaluated with four-ball machines and an Optimol SRV-IV oscillating friction and wear tester. The influence of the alkyl chain length on their lubricating abilities was also studied. The results demonstrated that all three Salkyl- N,N-dicarboxymethyl dithiocarbamates can improve the extreme-pressure, antiwear, and friction-reducing properties of the water-glycol hydraulic fluid to different degrees; that is, the additive with the longest alkyl chain exhibited the best tribological properties, especially at high loads. The worn surfaces were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The analytical results of typical elements on the worn surfaces demonstrated that these additives reacted with the steel surfaces during the friction processes and generated a protective film mainly composed of iron sulfides, iron oxides, and organic amines, which played an important role in improving the tribological properties of the base liquid. © Society of Tribologists and Lubrication Engineers.


Wang J.,CAS Lanzhou Institute of Chemical Physics | Wang J.,University of Chinese Academy of Sciences | Wang J.,Navy Logistical Technical Equipment Research Institute | Li C.,Navy Logistical Technical Equipment Research Institute | And 2 more authors.
Industrial Lubrication and Tribology | Year: 2014

Purpose - The purpose of this paper is to present the tribological, anticorrosion and antirust properties of three 2,5-dimercapto-1,3,4-thiadiazole (DMTD) derivatives as water-soluble additives in water-glycol hydraulic fluid. Design/methodology/approach - DMTD derivatives possessing excellent corrosion inhibiting and extreme-pressure (EP) properties have long been used as metal passivators and load-carrying additives in lubricating oils and grease. However, there are seldom literatures about DMTD derivatives as water-soluble lubricant additives as yet. In this work, three DMTD derivatives were synthesized and investigated as water-soluble additives in the water-glycol hydraulic fluid. Their tribological properties were evaluated in detail by four-ball wear test machine and Optimol SRV-IV oscillating friction and wear tester. Meanwhile, their anticorrosion and antirust properties were also investigated by copper strip corrosive tests and antirust tests, respectively. The worn surfaces were analyzed by scanning electron microscope and X-ray photonelectron spectroscope, and the EP, antiwear and friction-reducing mechanisms were primarily proposed. Findings - The synthesized three DMTD derivatives (coded as A, B and C) have excellent solubility in the base liquid of the water-glycol hydraulic fluid. The experimental results demonstrated that all these compounds, especially A, could remarkably improve the EP, antiwear and friction-reducing properties of the base liquid. Furthermore, they all have perfect copper corrosion inhibiting and antirust properties with low adding concentration (< 3 weight per cent) in the base liquid and hence could be used as multifunctional additives in the water-glycol hydraulic fluid. Research limitations/implications - This research only focused on the synthesized DMTD derivatives. If possible, some other thiadiazole derivatives also should be investigated. Practical implications - The synthesized DMTD derivatives, especially compound A, can be used as multifunctional water-soluble additives in the water-glycol hydraulic fluid. Originality/value - In this paper, three DMTD derivatives were synthesized and their tribological behaviors as water-soluble lubricant additives were investigated for the first time. In addition, the EP, antiwear and friction-reducing mechanisms were also put forward. Copyright © 2014 Emerald Group Publishing Limited. All rights reserved.


Wang J.,CAS Lanzhou Institute of Chemical Physics | Wang J.,University of Chinese Academy of Sciences | Wang J.,Navy Logistical Technical Equipment Research Institute | Li J.,CAS Lanzhou Institute of Chemical Physics | And 3 more authors.
Industrial Lubrication and Tribology | Year: 2010

Purpose - The purpose of this paper is to prepare water-soluble TiODN 2 nanoparticles and evaluate the tribological properties as additives in water. Design/methodology/approach - Nanoparticles present excellent friction-reducing and antiwear properties as additives in base oils. However, there are seldom literatures about the nanoparticles as additives in water as yet. In this work, water-soluble TiODN2 nanoparticles were prepared by sol-gel method and characterized with transmission electron microscopy and selected area electron diffraction. The tribological properties as additives in water were investigated by SRV and the surface analysis by scanning electron microscope and X-ray photon electron spectroscope. Findings - TiODN2 nanoparticles modified with polyethylene glycol have uniform size about 10?nm and easily dissolve in water. The tribological experiments showed TiODN 2 nanoparticles exhibit excellent friction-reducing and antiwear properties. Research limitations/implications - The paper is restricted to only TiODN2 nanoparticles. Some other water-soluble nanoparticles also should be prepared and their tribological properties investigated. Practical implications - Water-soluble TiODN2 nanoparticles could be used as water additives and improve the tribological properties. Originality/value - This paper emphasises that the water-soluble nanoparticles are prepared and could be used as water additives. © 2010 Emerald Group Publishing Limited. All rights reserved.

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