Potential-Controlled Boundary Lubrication of Stainless Steels in Non-aqueous Sodium Dodecyl Sulfate Solutions

Yang, Xiaoyong; Meng, Yonggang; Tian, Yu

doi:10.1007/s11249-013-0240-9

Cited by 30 publications

(17 citation statements)

References 23 publications

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“…In our previous report [18], we showed a bad wear resistance of 0.5 mM SDS/PC solution on steel surface at -0.9 V, which is opposite to the result for the IL/PC solution in this report. The contrary effects of negative electrical potential on wear are attributed to the difference in the adsorbed components on the steel surface at the potential.…”

Section: Ellipsometric Testcontrasting

confidence: 99%

“…3.1. The CV measurement results are analogous to those observed for steels in SDS/PC solutions [18].…”

Section: Adsorption Of Ions On Steel Surface At Different Potentialssupporting

confidence: 81%

“…In the present work, we study tribological performance of three imidazolium IL additives, 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIm]BF 4 ), 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIm]PF 6 ) and 1-decyl-3-methylimidazolium hexafluorophosphate ([DMIm]PF 6 ), in ester propylene carbonate (PC) base lubricant under different electrical potentials. As shown in previous investigations, the electrical potential plays an important role in ionic surfactant adsorption on metal surfaces in liquids [14][15][16] and thus has an impact on the boundary lubrication in water or PC environment [10,17,18]. The purpose of this study was to investigate the synergetic effect of imidazolium ILs and electrical potential on the lubricity of the ester PC.…”

Section: Introductionmentioning

confidence: 87%

“…To provide new evidence for the adsorption of ions on steel surfaces in non-aqueous IL solutions at OCP, we measured the impedance characteristics of steel surfaces in IL/PC solutions at OCP using EIS technique, the detail of which is available in our previous report [18]. Figure 7 shows the impedance spectra of AISI 4340 electrodes in 0.5 mM (empty triangles), 1 mM (empty squares) and concentration is increased.…”

Section: Adsorption Of Ions On Steel Surface At Different Potentialsmentioning

confidence: 99%

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Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

2014

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Three different ionic liquids (ILs), 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIm]BF 4 ), 1-octyl-3-methylimidazolium hexafluorophosphate ([OMIm]PF 6 ) and 1-decyl-3-methylimidazolium hexafluorophosphate ([DMIm]PF 6 ), were used as additives in the base ester propylene carbonate (PC) for the lubrication of AISI 4340 steel surfaces. Ball-on-disk friction tests were done under different electrical potentials to investigate the synergetic effect of IL concentration and electrical potential on lubrication performance, and electrochemical and ellipsometric tests were conducted to explore the adsorption of IL additives at different potentials. The friction reduction and anti-wear performance of the tested three IL/PC solutions illustrated similar dependence on electrical potential. In the potential range from -0.6 to ?0.6 V, friction coefficient increases rapidly. When the potential is more negative than -0.6 V, friction coefficient is at the lower level of about 0.13. When the potential is greater than ?0.6 V, friction coefficient is at the higher level of about 0.2. The electrochemical test results show that [DMIm]PF 6 /PC solution is the lowest in corrosion against AISI 4340 steel among the three tested lubricants. The wear of steel surface in 0.5 mM [DMIm]PF 6 /PC solution is reduced when electrical potential is shifted to -1.0 V comparing with that at open-circuit potential. The potential-dependent friction and wear behaviors are explained in terms of the variation of the adsorbed ion species and the surface concentration of the adsorbed ions under different additive concentration and electrical potential conditions.

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Section: Ellipsometric Testcontrasting

confidence: 99%

“…3.1. The CV measurement results are analogous to those observed for steels in SDS/PC solutions [18].…”

Section: Adsorption Of Ions On Steel Surface At Different Potentialssupporting

confidence: 81%

Section: Introductionmentioning

confidence: 87%

Section: Adsorption Of Ions On Steel Surface At Different Potentialsmentioning

confidence: 99%

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Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

2014

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“…Suitable additives are needed to improve the tribological properties of water-based lubricants so that its potential applications would be extended [3,4]. Surfactants such as sodium dodecyl sulfate (SDS) are usually used in aqueous solutions as they are easily adsorbed to liquid/ solid interfaces because of their amphiphilic nature, which is especially efficient in the boundary lubrication regime [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Stick–Slip Friction of Stainless Steel in Sodium Dodecyl Sulfate Aqueous Solution in the Boundary Lubrication Regime

Zhang

Meng

2014

Tribol Lett

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The objective of this study is to correlate the mass and structure of the adsorbed sodium dodecyl sulfate (SDS) on stainless steel surface in aqueous solution with the boundary lubrication behavior, especially the stick-slip phenomenon of the ZrO 2 /stainless steel friction pair. Surface tension measurement, quartz crystal microbalance (QCM) technique and ball-on-flat friction test were performed in this study. The adsorption isotherm of SDS on stainless steel surface in SDS aqueous solution was measured by QCM, and four-stage adsorption behavior was found at the solid/liquid interface. As the SDS concentration increases, the mass of the adsorbed SDS molecules increases, while the structure of the adsorbed layer changes from monomers to hemimicelles. Tribological properties of ZrO 2 /stainless steel friction pair in SDS aqueous solution were verified with an UMT-3 tester. Boundary lubrication was emphasized as water-based lubrication easily fails in hydrodynamic lubrication due to its low viscosity. Stickslip phenomenon was observed in the boundary lubrication of the adsorbed SDS film under certain loading and sliding conditions. Both the static and kinetic friction coefficients were analyzed with respect to the SDS concentration and sliding velocity. The stick-slip phenomenon is related to both of the adsorbed mass and adsorption structure of the SDS boundary film.

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Controllable Friction of Green Ionic Liquids via Environmental Humidity

et al. 2020

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Intelligent control of friction is an attractive but challenging topic. In this work, it is investigated if it would be possible to adjust friction in a lubricated contact by controlling environmental humidity. By exploiting the ability to adjust the environmental humidity by various saturated salt solutions, friction behavior of contacts lubricated with Choline l‐Proline ([Cho][Pro]) is modulated in a wide range of relative humidity (RH). The friction increases when the environmental humidity is increased and decreases when water is partially evaporated to a lower RH. It is thus possible to control friction by environmental humidity. The addition of water in ionic liquids (ILs) causes a decrease in viscosity, but as the tests are calculated to be performed in boundary lubrication the viscosity change is not the main factor for the change in friction. The friction sensitivity of RH can be explained by the effect of adhesion on the water uptake from humid air by [Cho][Pro]. Furthermore, the reversible changes of H‐bond types determined by the water content could be another explanation to the altered friction.

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Potential-Controlled Boundary Lubrication of Stainless Steels in Non-aqueous Sodium Dodecyl Sulfate Solutions

Cited by 30 publications

References 23 publications

Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

Effect of Imidazolium Ionic Liquid Additives on Lubrication Performance of Propylene Carbonate under Different Electrical Potentials

Stick–Slip Friction of Stainless Steel in Sodium Dodecyl Sulfate Aqueous Solution in the Boundary Lubrication Regime

Controllable Friction of Green Ionic Liquids via Environmental Humidity

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