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Research Article | Open Access

Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions

Wenrui LIU1, Hongdong WANG2( ), Yuhong LIU1( )
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
School of Mechatronic Engineering and Key Laboratory of Advanced Display and System Application, Ministry of Education, Shanghai University, Shanghai 200444, China
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Abstract

Polyalkylene glycol (PAG) aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient (COF, μ < 0.01). However, the prolonged running-in period and low bearing capacity have limited its widespread application. In this study, we determined that the running-in period can be decreased by more than 75% when the pH value of the lubricant is controlled at 3 by introducing various acid solutions. Additionally, less time was required to realize stable superlubricity with inorganic acid at lower pH values. This was mainly attributed to the acceleration effect of hydrogen ions around the contact region. In case of PAG aqueous solution with organic acid, the wear loss between sliding solid surfaces was reduced, and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 MPa. Furthermore, the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid surfaces. This in turn strengthened the structure of the adsorption layers. The unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications.

Keywords

superlubricityrunning-in timebearing pressureorganic acidhydrogen bond

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Friction
Volume 11 Issue 7,
July 2023
Pages 1138-1149
DOI: 10.1007/s40544-022-0626-5
Cite this article:
LIU W, WANG H, LIU Y. Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions. Friction, 2023, 11(7): 1138-1149. https://doi.org/10.1007/s40544-022-0626-5

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Received: 22 February 2021
Revised: 01 July 2021
Accepted: 24 March 2022
Published: 16 July 2022
© The author(s) 2022.

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