Using Electrochemical and Spectroscopic Techniques as Probes for Investigating Metal-Lubricant Interactions

Wang, Simon S.; Tung, Simon C.

doi:10.1080/10402009008981990

Cited by 14 publications

(3 citation statements)

References 14 publications

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“…In the late 1980s Tung et al carried out a series of experiments to study the influence of applied electric field on additive reactions on surfaces and the impact of consequent tribofilms on friction and wear [28,[75][76][77][78][79]. Using two electrodes with a 15-μm gap to minimise resistance, and impedance spectroscopy to estimate film properties, they showed that large potential differences could cause zinc dialkyldithiophosphate (ZDDP) and some other additives dissolved in mineral oil to form films on unrubbed surfaces.…”

Section: Research On Non-aqueous Systemsmentioning

confidence: 99%

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Spikes

2020

Tribol Lett

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Research on the effects of applied electrical potential on friction and wear, a topic sometimes termed “Triboelectrochemistry”, has been reviewed. Historically, most such research has focussed on aqueous lubricants, whose relatively high electrical conductivities enable use of three-electrode electrochemical kinetic techniques, in which the electrode potential at a single electrode | fluid interface is controlled relative to a suitable reference electrode. This has led to identification of several different mechanisms by which applied electrode potentials can influence friction and wear. Of these, the most practically important are: (i) promotion of adsorption/desorption of polar additives on tribological surfaces by controlling the latters’ surface charges; (ii) stimulation or suppression of redox reactions involving either oxygen or lubricant additives at tribological surfaces. In recent years, there has been growing interest in the effects of applied electrical potentials on rubbing contacts lubricated by non-aqueous lubricants, such as ester- and hydrocarbon-based oils. Two different approaches have been used to study this. In one, a DC potential difference in the mV to V range is applied directly across a thin film, lubricated contact to form a pair of electrode | fluid interfaces. This has been found to promote some additive reactions and to influence friction and wear. However, little systematic exploration has been reported of the underlying processes and generally the electrode potentials at the interfaces have not been well defined. The second approach is to increase the conductivity of non-aqueous lubricants by adding secondary electrolytes and/or using micro/nanoscale electrodes, to enable the use of three-electrode electrochemical methods at single metal | fluid interfaces, with reference and counter electrodes. A recent development has been the introduction of ionic liquids as both base fluids and lubricant additives. These have relatively high electrical conductivities, allowing control of applied electrode potentials of individual metal | fluid interfaces, again with reference and counter electrodes. The broadening use of “green”, aqueous-based lubricants also enlarges the possible future scope of applied electrode potentials in tribology. From research to date, there would appear to be considerable opportunities for using applied electrical potentials both to promote desirable and to supress unwanted lubricant interactions with rubbing surfaces, thereby improving the tribological performance of lubricated machine components. Graphical Abstract

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Section: Research On Non-aqueous Systemsmentioning

confidence: 99%

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Spikes

2020

Tribol Lett

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“…2 To understand the mechanism of corrosion in a given lubricating system, electrochemical spectroscopic techniques [3][4][5][6] including linear and non-linear impedance spectroscopy have been studied 7-9 at a very high sinusoidal applied voltage. However, the application of EIS in these systems can be challenging and somewhat restricted due to the poor conductivity of the lubricating oil.…”

Section: Introductionmentioning

confidence: 99%

“…In the past decade, electrochemical impedance spectroscopy (EIS) has been shown to be a simple, relatively quick and inexpensive tool to investigate the corrosion behaviour of a lubricating oil system and has also helped to differentiate between neat and aged oils. 2 To understand the mechanism of corrosion in a given lubricating system, electrochemical spectroscopic techniques [3][4][5][6] including linear and non-linear impedance spectroscopy have been studied [7][8][9] at a very high sinusoidal applied voltage. However, the application of EIS in these systems can be challenging and somewhat restricted due to the poor conductivity of the lubricating oil.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion behaviour of biodegradable base oils using electrochemical techniques

Khemchandani

Jaiswal

Sayanna

et al. 2014

Corrosion Engineering, Science and Technology

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This paper describes an interesting attempt to quantitatively evaluate the corrosion behaviour of base oils using a novel approach based on electrochemical techniques. The present study evaluates the corrosion behaviour of biodegradable base oils with and without additives in an aqueous chloride solution using electrochemical measurements. Potentiodynamic polarisation and electrochemical impedance spectroscopy techniques were used to quantitatively determine the corrosion behaviour of these oils, and the results were compared to the conventional immersion tests. Both these electrochemical measurements were carried out in a three-electrode system where AS1020 mild steel alloy was used as a working electrode in a purpose made pipette cell. The results obtained from the electrochemical measurements help to evaluate the best biodegradable base oil for formulating eco-friendly industrial lubricants.

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Triboelectrochemistry on a nanometre scale

Zhu¹,

Kelsall

Spikes

1996

Tribol Lett

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Atomic force microscopy was used to measure the spatial distribution of friction on iron electrodes under controlled electrode potentials in alkaline electrolytes. Electrochemical oxidation greatly decreased the mean friction values, which were further diminished by addition of octanoic acid, due to the anodic formation of iron oxide and octanoate phases, respectively. While the application of a potential step to oxidising conditions produced a relatively homogeneous spatial distribution of friction, potential cycling between oxidising and reducing conditions resulted in inhomogeneities at the 100 nm scale.

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Using Electrochemical and Spectroscopic Techniques as Probes for Investigating Metal-Lubricant Interactions

Cited by 14 publications

References 14 publications

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Triboelectrochemistry: Influence of Applied Electrical Potentials on Friction and Wear of Lubricated Contacts

Evaluation of corrosion behaviour of biodegradable base oils using electrochemical techniques

Triboelectrochemistry on a nanometre scale

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