On-Line Feedback Control of Sliding Friction of Metals Lubricated by Adsorbed Boundary SDS Films

Liu, Chenxu; Li, Xiaosong; Li, Xinxin; Li, Weizi; Tian, Yu; Meng, Yonggang

doi:10.3390/lubricants10070148

Cited by 9 publications

(13 citation statements)

References 28 publications

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“…Only when the positive potential was applied, a relatively complete boundary film was formed, which resulted in the significantly increase of the contact resistance. On the contrary, at the initial stage of boundary film failure, the change of contact resistance was more quickly than that of COF [39].…”

Section: Effect Of Electric Fields On Boundary Film and Wear Particle...mentioning

confidence: 86%

Mitigation of tribocorrosion of metals in aqueous solutions by potential-enhanced adsorption of surfactants

et al. 2023

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Corrosion and corrosive wear occur commonly on metals surface in aqueous solutions. External electric field is usually considered as one of the factors to accelerate corrosion or corrosive wear of materials in the presence of conventional electrolytes. This work aims to reposition widely believed perspective by experimental justification which have been conducted in aqueous solutions containing surfactants. Electric potential of metal surfaces was modulated externally within the electrochemical potential window of the metal electrode-solution-counter electrode system, which actively regulated the adsorption or desorption of surfactant molecule in the aqueous solution over the electrodes to form a molecular barrier of electron transportation across the electrode-electrolyte interface. The advantage of the approach over the anodic passivation is negligible redox reactions on the protected electrode surface while a better lubricious and wear resistant film than oxide is maintained in the meantime. Tribopairs of several metal/metal and metal/ceramic were tested by employing a ball-on-disc tribometer with anionic and cationic surfactants solutions. For anionic surfactant as the modifier, positive surface potential enables coefficient of friction to be decreased by promoting the formation of adsorption film on metal surface in aqueous solutions. For cationic surfactant, negative surface potential plays a role in decreasing the coefficient of friction. Phase diagrams of friction and wear in wide ranges of surfactant concentration and surface potential were plotted for the tested metal/metal and metal/ceramic tribopairs. These results indicate that the adsorption behavior of molecules or ions at the metal-aqueous interface can be well regulated when an external electric field is present without inducing corrosion or corrosive wear.

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Section: Effect Of Electric Fields On Boundary Film and Wear Particle...mentioning

confidence: 86%

Mitigation of tribocorrosion of metals in aqueous solutions by potential-enhanced adsorption of surfactants

et al. 2023

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“…The lubrication condition of the bearing also has a crucial influence on the interference images of the oil film, with significant differences observed between oil film interference images at different lubrication levels (Liang et al, 2022). The resulting thermal effects are one of the primary causes of bearing wear (Li et al, 2023). Therefore, interference images can be used to monitor the oil film thickness and wear of bearings (Rosenkranz et al, 2017) to ensure the safe operation of bearings.…”

Section: Optical Interference Methodsmentioning

confidence: 99%

“…, 2022). The resulting thermal effects are one of the primary causes of bearing wear (Li et al. , 2023).…”

Section: Optical Measurement Methodsmentioning

confidence: 99%

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Shang,

Sun,

Cai

2024

ILT

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Purpose The purpose of this study is to investigate the application of non-destructive testing methods in measuring bearing oil film thickness to ensure that bearings are in a normal lubrication state. The oil film thickness is a crucial parameter reflecting the lubrication status of bearings, directly influencing the operational state of bearing transmission systems. However, it is challenging to accurately measure the oil film thickness under traditional disassembly conditions due to factors such as bearing structure and working conditions. Therefore, there is an urgent need for a nondestructive testing method to measure the oil film thickness and its status. Design/methodology/approach This paper introduces methods for optically, electrically and acoustically measuring the oil film thickness and status of bearings. It discusses the adaptability and measurement accuracy of different bearing oil film measurement methods and the impact of varying measurement conditions on accuracy. In addition, it compares the application scenarios of other techniques and the influence of the environment on detection results. Findings Ultrasonic measurement stands out due to its widespread adaptability, making it suitable for oil film thickness detection in various states and monitoring continuous changes in oil film thickness. Different methods can be selected depending on the measurement environment to compensate for measurement accuracy and enhance detection effectiveness. Originality/value This paper reviews the basic principles and latest applications of optical, electrical and acoustic measurement of oil film thickness and status. It analyzes applicable measurement methods for oil film under different conditions. It discusses the future trends of detection methods, providing possible solutions for bearing oil film thickness detection in complex engineering environments.

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“…Therefore, previous studies through controlling ion adsorption and its lubrication by applying electric potential provided no effective method to study the tribological characteristics of anions between two positively charged surfaces, no matter at the microscale (by EC-SFA and EC-SFM) or macroscale (by universal micro tribometer) conditions, but these findings still provide us with thought-provoking opinion of friction control. 35 Besides, pH-induced switchable friction was achieved using nanohydrogel brushes under aqueous solutions through governing the hydration state. 36 Inspired by our previous findings, friction surfaces can be positively charged in acidic aqueous solutions at a pH value lower than the isoelectric point (IEP).…”

Section: Introductionmentioning

confidence: 99%

Macroscale Superlubricity of Hydrated Anions in the Boundary Lubrication Regime

Han,

Zhao,

Sun

et al. 2023

ACS Appl. Mater. Interfaces

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Cations can achieve excellent hydration lubrication at smooth interfaces under both microscale and macroscale conditions due to the boundary layer composed of hydration shells surrounding charges, but what about anions? Commonly used friction pairs are negatively charged at the solid/solution interface. Achieving anionic adsorption through constructing positively charged surfaces is a prerequisite for studying the hydration lubrication of anions. Here we report the hydration layer composed of anions adsorbed on the positively charged polymer/ sapphire interface at acidic electrolyte solutions with pH below the isoelectric point, which contributes to the hydration lubrication of anions. Strongly hydrated anions (for the case of SO 4 2−) exhibit stable superlubricity comparable to cations, with strikingly low boundary friction coefficient of 0.003−0.007 under contact pressures above 15 MPa without a running-in period. The hydration lubrication performance of anions is determined by both the ionic hydration strength and ion adsorption density based on the surface potential and tribological experiments. The results shed light on the role of anions in superlubricity and hydration lubrication, which may be relevant for understanding the lubrication mechanism and improving lubrication performance in acidic environments, for example, in acid pumps, sealing rings of compressors for handling acidic media, and processing devices of nuclear waste.

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On-Line Feedback Control of Sliding Friction of Metals Lubricated by Adsorbed Boundary SDS Films

Cited by 9 publications

References 28 publications

Mitigation of tribocorrosion of metals in aqueous solutions by potential-enhanced adsorption of surfactants

Mitigation of tribocorrosion of metals in aqueous solutions by potential-enhanced adsorption of surfactants

A comprehensive review of non-destructive methods for bearing lubricating oil film thickness measurement

Macroscale Superlubricity of Hydrated Anions in the Boundary Lubrication Regime

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