Study on tribological behavior, lubrication and anti-corrosion properties of W/O microemulsion for cold rolling of copper strip

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hao Wu ◽  
Sang Xiong ◽  
Wei Lin ◽  
Fanxin Kong
Keyword(s):  
Cold Rolling ◽  
Peer Review ◽  
Tribological Behavior ◽  
Copper Surface ◽  
Corrosion Properties ◽  
Copper Strip ◽  
Content Type ◽  
Base Oil ◽  
Lubrication Performance ◽  
Rolling Oil

Purpose The purpose of this paper is to improve lubrication and anti-corrosion properties of the water-in-oil (W/O) microemulsion for rolling of copper strip and sheet to replace the traditional rolling oil. Design/methodology/approach The W/O microemulsion is prepared by using hydrogenated base oil, a deionized aqueous solution of 0.03 mol/L of Na2SO4 and composite emulsifier such as Sp20, Tx-7 or sodium petroleum sulfonate. Tribological behavior of the microemulsions and traditional cold rolling oil was conducted by MR-10A four-ball tester. The lubrication performance of microemulsion for cold rolling of copper strip was performed by cold-rolling experiment. The morphology of worn surface and the rolled copper was characterized. Anti-corrosion properties of microemulsion for rolled copper was investigated, and the corroded surface was analyzed by X-ray photoelectron spectrometer (XPS). Findings The results show that the extreme pressure and antiwear properties of the microemulsions have been improved; the average friction coefficient of the improved microemulsion is 0.065, which is 30% lower than the commercial cold rolling oil. For cold rolling of copper strip, the microemulsion has a higher thinning effect than the commercial cold rolling oil, and a smooth surface is obtained and the surface roughness (Sa) is decreased by 6.8%. The XPS analysis indicated microemulsion adsorbed on the copper surface mitigate the corrosion of oils. Originality/value This paper used the prepared W/O microemulsion as a new lubricant in the process of rolling for copper strip and sheet in industry, demonstrating the microemulsion has broad application prospects in the future. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-06-2020-0227/

scholarly journals Tribological behavior of oils additised with a phosphonium-derived ionic liquid compared to a commercial oil

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Marlene Bartolomé Sáez ◽  
Antolin E. Hernández Battez ◽  
Jorge Espina Casado ◽  
José L. Viesca Rodríguez ◽  
Alfonso Fernández-González ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Peer Review ◽  
Formation Rate ◽  
Antiwear Additives ◽  
Stribeck Curve ◽  
Content Type ◽  
Base Oil ◽  
Base Oils ◽  
Antiwear Properties ◽  
Commercial Oil

Purpose The purpose of this paper is to study the antifriction, antiwear and tribolayer formation properties of the trihexyltetradecylphosphonium bis(2,4,4-trimethylpentyl) phosphinate ionic liquid (IL) as additive at 1 wt.% in two base oils and their mixtures, comparing the results with those of a commercial oil. Design/methodology/approach The mixture of the base oils used in the formulation of the commercial oil SAE 0W20 plus the IL was tested under rolling/sliding and reciprocating conditions to determine the so-called Stribeck curve, the tribolayer formation and the antifriction and antiwear behaviors. Findings The use of this IL as additive in these oils does not change their viscosity; improves the antifriction and antiwear properties of the base oils, making equal or outperforming these properties of the SAE 0W20; and the thickness and formation rate of the tribolayer resulting from the IL-surface interaction is highly dependent on the type of base oil and influence on the friction and wear results. Originality/value The use of this IL allows to replace partial or totally commercial antifriction and antiwear additives. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2020-0179/

Deformation mechanism and tribological behavior of hydrogen-free carburized layer on Ti-6Al-4V alloy

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Tian Tian ◽  
Ruibo Zhao ◽  
Dongbo Wei ◽  
Kai Yang ◽  
Pingze Zhang
Keyword(s):  
Peer Review ◽  
Deformation Mechanism ◽  
Tribological Behavior ◽  
Scratch Test ◽  
Hardness Profile ◽  
Cross Sectional ◽  
Content Type ◽  
Elastic Plastic ◽  
The Coefficient Of Friction ◽  
Carburized Layer

Purpose The purpose of this paper is to expound the relationship among microstructure, mechanical property, tribological behavior and deformation mechanism of carburized layer deposited on Ti-6Al-4V alloy by double-glow plasma hydrogen-free carburizing surface technology. Design/methodology/approach Morphologies and phase compositions of the carburized layer were observed by scanning electron microscope and X-ray diffraction. The micro-hardness tests were used to evaluate the surface and cross-sectional hardness of carburized layer. The reciprocating friction and wear experiments under various load conditions were implemented to investigate the tribological behavior of carburized layer. Moreover, scratch test with ramped loading pattern was carried out to illuminate the deformation mechanism of carburized layer. Findings Compared to substrate, the hardness of surface improved to ∼1,100 HV0.1, while the hardness profile of carburized layer presented gradual decrease from ∼1,100 to ∼300 HV0.1 within the distance of the total carburizing-affected region about 30 µm. The coefficient of friction, wear rate and wear morphology of carburized layer were analyzed. Scratch test indicated that the deformation process of carburized layer could be classified into three mechanisms (elastic, changing elastic–plastic and stable elastic–plastic mechanisms), and the deformation transition of the carburizing-affected region was from changing elastic–plastic to elastic mechanisms. Both the elastic and changing elastic–plastic mechanisms are conducive to the wearing course. Originality/value Using this technology, hydrogen embrittlement was avoided and wear resistance property of titanium alloy was greatly improved. Simultaneously, the constitutive relation during the whole loading process was deduced in terms of scratch approach, and the deformation mechanism of carburized layer was discussed from a novel viewpoint. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-11-2019-0489/

Experimental analysis and modeling of viscosity and thermal conductivity of GNPs/SAE 5W40 nanolubricant

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Valéry Tusambila Wadi ◽  
Özkan Özmen ◽  
Mehmet Baki Karamış
Keyword(s):  
Thermal Conductivity ◽  
Peer Review ◽  
Dynamic Viscosity ◽  
Ann Model ◽  
Step Method ◽  
Rotational Viscometer ◽  
Content Type ◽  
Base Oil ◽  
Artificial Neural Network Ann ◽  
The Stability

Purpose The purpose of this study is to investigate thermal conductivity and dynamic viscosity of graphene nanoplatelet-based (GNP) nanolubricant. Design/methodology/approach Nanolubricants in concentrations of 0.025, 0.05, 0.1 and 0.5 Wt% were prepared by means of two-step method. The stability of nanolubricants was monitored by visual inspection and dynamic light scattering tests. Thermal conductivity and dynamic viscosity of nanolubricants in various temperatures between 25°C–70°C were measured with KD2-Pro analyser device and a rotational viscometer MRC VIS-8, respectively. A comparison between experimentally achieved results and those obtained from existing models was performed. New correlations were proposed and artificial neural network (ANN) model was used for predicting thermal conductivity and dynamic viscosity. Findings The designed nanolubricant showed good stability after at least 21 days. Thermal conductivity and dynamic viscosity increased with particles concentration. In addition, as the temperature increased, thermal conductivity increased but dynamic viscosity decreased. Compared to the base oil, maximum enhancements were achieved at 70°C with the concentration of 0.5 Wt.% for dynamic viscosity and at 55°C with the same concentration for thermal conductivity. Besides, ANN results showed better performance than proposed correlations. Practical implications This study outcomes will contribute to enhance thermophysical properties of conventional lubricating oils. Originality/value To the best of our knowledge, there is no paper related to experimental study, new correlations and modelling with ANN of thermal conductivity and dynamic viscosity of GNPs/SAE 5W40 nanolubricant in the available literature. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2020-0088/

Influence of microdimple on lubrication performance of textured plunger pump

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hekun Jia ◽  
Zeyuan Zhou ◽  
Bifeng Yin ◽  
Huiqin Zhou ◽  
Bo Xu
Keyword(s):  
Peer Review ◽  
Surface Texture ◽  
High Performance ◽  
Combustion Engine ◽  
Surface Texturing ◽  
Laser Surface Texturing ◽  
Content Type ◽  
Lubrication Performance ◽  
Simulation Results ◽  
The Cost

Purpose The purpose of this study is to investigate the influence of dimple radius, depth and density on the lubrication performance of the plunger. Design/methodology/approach A lubrication model was adopted to consider eccentricity and deformation during the working process of the plunger, and a rig test was performed to confirm the simulation results. The texture was fabricated using laser surface texturing. Findings The simulation results suggested that when dimple radius or depth increases, oil film thickness of the plunger increases before decreasing, and asperity friction displays an opposite trend. Therefore, appropriate microdimple texture could facilitate lubrication performance improvement and reduce the wear. Microdimples were then lased on the plunger surface, and a basic tribological test was conducted to validate the simulation results. The experimental results suggested that the average friction coefficient decreased from 0.18 to 0.13, a reduction of 27.8%. Social implications The introduction of microdimple on a plunger couple to reduce friction and improve lubrication is expected to provide a new approach to developing high-performance plunger couple and improve the performance of the internal combustion engine. If applied, the surface texture could help reduce friction by around 27% and cap the cost relative to the plugger friction. Originality/value The microdimple texture was introduced into the plunger couple of a vehicle to reduce the friction and improve the performance. Findings suggested that surface texture could be used in the automotive industry to improve oil efficiency and lubrication performance. Peer review The peer review history for this article is available at: http://dx.doi.org/10.1108/ILT-07-2020-0259.

Tribological properties of MoS2 powder-lubricated interface

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Cong Liu ◽  
Yanguo Yin ◽  
Baohong Tong ◽  
Guotao Zhang
Keyword(s):  
Peer Review ◽  
Tribological Properties ◽  
Testing Machine ◽  
Point Contact ◽  
Contact Friction ◽  
Content Type ◽  
Friction Noise ◽  
Sliding Interface ◽  
Lubrication Performance ◽  
Powder Lubrication

Purpose This study aims to investigate the effect of MoS2 powder on tribological properties of sliding interfaces. Design/methodology/approach Loose MoS2 powder was introduced in the gap of point-contact friction pairs, and sliding friction test was conducted using a testing machine. Friction noise, wear mark appearance, microstructure and wear debris were characterized with a noise tester, white-light interferometer, scanning electron microscope and ferrograph, respectively. Numerical simulation was also performed to analyze the influence of MoS2 powder on tribological properties of the sliding interface. Findings MoS2 powder remarkably improved the lubrication performance of the sliding interface, whose friction coefficient and wear rate were reduced by one-fifth of the interface values without powder. The addition of MoS2 powder also reduced stress, plastic deformation and friction temperature in the wear mark. The sliding interface with MoS2 powder demonstrated lower friction noise and roughness compared with the interface without powder lubrication. The adherence of MoS2 powder onto the friction interface formed a friction film, which induced the wear mechanism of the sliding interface to change from serious cutting and adhesive wear to delamination and slight cutting wear under the action of normal and shear forces. Originality/value Tribological characteristics of the interface with MoS2 powder lubrication were clarified. This work provides a theoretical basis for solid-powder lubrication and reference for its application in engineering. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0150/

The thermal oxidation mechanism of TMPTO with antioxidants investigated by ReaxFF MD

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Wen Zhan ◽  
Shengpeng Zhan ◽  
HaiTao Duan ◽  
Xinxiang Li ◽  
Jian Li ◽  
...  
Keyword(s):  
Peer Review ◽  
Thermal Oxidation ◽  
High Performance ◽  
Oxidation Mechanism ◽  
Decomposition Reaction ◽  
Deep Oxidation ◽  
Content Type ◽  
Base Oil ◽  
Tert Butyl ◽  
Antioxidant Additives

Purpose This paper aims to study the thermal oxidation performance of antioxidant additives in ester base oils deeply. Design/methodology/approach ReaxFF molecular dynamics was used to simulate the thermal oxidation process of butyl octyl diphenylamine and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propanoate as two antioxidant additives act on the Trimethylolpropane trioleate (TMPTO) base oil. Meanwhile, combining with the infrared spectroscopy characterization results of the thermal oxidation test, this paper provides theoretical support for the development of high-performance synthetic lubricants and their antioxidant additives. Findings The results show that butyl octyldiphenylamine easily removes the hydrogen atom on the secondary amine, which promotes the formation of more long carbon chain diene radicals or polyene hydroperoxides from TMPTO. Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propanoate could easily decompose into octadecyl hydroperoxide and 2,6-di-tert-butyl 4-propionylphenol, which could convert into 2-tert-butyl-4-peroxyethyl-6-hydroperoxy-tert-butylphenol in the middle of the thermal oxidation reaction, prompting TMPTO to form more short-chain alkenyl and olefin hydroperoxide or other oxide. Originality/value The main change characteristics of base oil molecules are the first thermal decomposition to form oleic acid groups and ethane cyclopropane methyl oleate. Under the action of butyl octyldiphenylamine and octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propanoate, the deep oxidation and decomposition reaction are slowed down. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-01-2020-0037/

Coupling analysis of the fatigue life and the TEHL contact behavior of ball screw under the multidirectional load

2020 ◽  
Vol 72 (10) ◽  
pp. 1285-1293
Author(s):  
Jia-Jia Zhao ◽  
Ming-Xing Lin ◽  
Xian-Chun Song ◽  
Nan Wei
Keyword(s):  
Fatigue Life ◽  
Film Thickness ◽  
Peer Review ◽  
Elastohydrodynamic Lubrication ◽  
Contact Model ◽  
Ball Screw ◽  
Content Type ◽  
Entrainment Velocity ◽  
Contact Points ◽  
Lubrication Performance

Purpose This paper aims to provide thermal elastohydrodynamic lubrication (TEHL) contact model to study all balls’ lubrication performance of the ball screw when the multidirectional load is applied. Design/methodology/approach A new TEHL contact model combining the multidirectional load and the roughness surface texture is established to describe fatigue life of the ball screw. Meanwhile, the authors use the Reynolds equation to study the lubrication performance of the ball screw. Findings When the multidirectional load is applied, contact load, slide-roll ratio and entrainment velocity of all balls have a periodic shape. The TEHL performance values at the ball-screw contact points including contact stress, shear stress, minimum film thickness and temperature rise are higher than that at the ball-nut contact points. The TEHL performance values increase with the increase of root mean square (RMS) except for the film thickness. In addition, the radial load of the ball screw has a significant effect on the fatigue life. Originality/value The results of the studies demonstrate the new TEHL contact model that provides the instructive significance to analyze the fatigue life of the ball screw under the multidirectional load. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2020-0097/

Assessment of artificial neural network for thermohydrodynamic lubrication analysis

2020 ◽  
Vol 72 (10) ◽  
pp. 1233-1238 ◽  
Author(s):  
Nenzi Wang ◽  
Chih-Ming Tsai
Keyword(s):  
Peer Review ◽  
Surrogate Model ◽  
Content Type ◽  
Lubrication Performance ◽  
Fast Solution ◽  
Artificial Neural ◽  
Computationally Intensive ◽  
Hidden Layer ◽  
Maximum Minimum ◽  
Generalized Reynolds Equation

Purpose In this study, artificial neural networks (ANNs) are constructed and validated by using the bearing data generated numerically from a thermohydrodynamic (THD) lubrication model. In many tribological simulations, a surrogate model (meta-model) for obtaining a fast solution with sufficient accuracy is highly desired. Design/methodology/approach The THD model is represented by two coupled partial differential equations, a simplified generalized Reynolds equation, considering the viscosity variation across the film thickness direction and a transient energy equation for the 3-D film temperature distribution. The ANNs tested are having a single- or dual-hidden-layer with two inputs and one output. The root-mean-square error and maximum/minimum absolute errors of validation points, when comparing with the THD solutions, were used to evaluate the prediction accuracy of the ANNs. Findings It is demonstrated that a properly constructed ANN surrogate model can predict the THD lubrication performance almost instantly with accuracy adequately retained. Originality/value This study extends the use of ANNs to the applications other than the analyses dealing with experimental data. A similar procedure can be used to build a surrogate model for computationally intensive tribological models to have fast results. One of such applications is conducting extensive optimum design of tribological components or systems. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2020-0109/

An experimental study on the tribological performance of water-lubricated journal bearings with three different materials

2020 ◽  
Vol 72 (10) ◽  
pp. 1159-1165
Author(s):  
Yanfeng Han ◽  
Lei Yin ◽  
Guo Xiang ◽  
Guangwu Zhou ◽  
Haizhou Chen ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Peer Review ◽  
Tribological Behavior ◽  
Operating Conditions ◽  
Butadiene Rubber ◽  
Test Rig ◽  
Vibration Acceleration ◽  
Content Type ◽  
Rubber Bearing

Purpose The tribological behavior, i.e. friction coefficient and wear rate, and vibration characteristics of the water-lubricated bearing was investigated. The water-lubricated bearing is made of three different materials, i.e. polyether-ether-ketone (PEEK), polyimide (PI) and nitrile-butadiene rubber (NBR). Design/methodology/approach The tribological behavior was investigated experimentally on a specially designed test rig. Three vibration sensors were used to record the vibration of the bearing. Findings The results indicated that the variation of friction coefficient with rotation speed agrees well with the trend of Stribeck curve. The tested friction coefficient of rubber bearing is higher than that of the other two bearings whether it is in the state of mixed-lubrication or hydrodynamic lubrication, and which causing a larger wear rate in rubber bearing. The PEEK bearing exhibits the best tribological properties due to it has smaller friction coefficient and wear rate. However, it can be found that the rubber bearing gives the minimum vibration acceleration, which means that the rubber bearing has the most potential to improve the stability of water-lubricated bearing rotor system. Originality/value In this study, a group of experiment studies conducted on a specially designed test rig. The comprehensive performance, including friction coefficient, vibration acceleration and wear rate, of water-lubricated bearing with three different materials, i.e. PEEK, PI and NBR, was compared systematically. The experiment research may offer a reference for the selection of material in water-lubricated bearing in specific operating conditions. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-10-2019-0447/

Research on Lubricating Properties of Alcohol and Ester in Stainless Steel Cold Rolling Process

2012 ◽  
Vol 557-559 ◽  
pp. 1427-1431
Author(s):  
Xu Zhang ◽  
Shi Ting Wang ◽  
Jian Lin Sun ◽  
Guo Hong Ding
Keyword(s):  
Stainless Steel ◽  
Cold Rolling ◽  
Aliphatic Alcohol ◽  
Chemical Properties ◽  
Rolling Process ◽  
304 Stainless Steel ◽  
Base Oil ◽  
Rolling Oil ◽  
Physical And Chemical ◽  
Lubricating Properties

aliphatic ester, aliphatic alcohol, stainless steel, cold rolling oil Abstract: In this paper, the deeply hydrogenated mineral oil 60N was used as base oil. The additives such as mixture of dodecanol and tetradecyl alcohol, hexadecanol alcohol, octadecyl alcohol, ethyl hydride laurate, methyl palmitate and butyl stearate were separately added to the base oil by 10 percent. Evaluate its physical and chemical properties, and cold rolling experiments were carried out on both 202 and 304 stainless steel lubricated by different rolling oil. The results showed that the aliphatic alcohol have better performance in lubricating and volatilizing properties than fatty acid ester. Moreover, the octadecyl alcohol showed the best lubricating properties compared with selected aliphatic alcohol.

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