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Research Article | Open Access

Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations

Hongyun CAI1, Caixia ZHANG1,2( ), Fuping LI1,2, Mengmeng LIU1, Tao ZHANG1,2, Hongyan CHU1,2, Zhifeng LIU2,3( )
Institute of Advanced Manufacturing and Intelligent Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
Machinery Industry Key Laboratory of Heavy Machine Tool Digital Design and Testing Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China
Key Laboratory of CNC Equipment Reliability, Ministry of Education, School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
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Graphical Abstract

Abstract

Hydrophilic polymer coatings on artificial implants generate excellent tribological properties. The friction properties of polymer coatings are affected by salt ion factors. Herein, the atomic force microscopy (AFM) was used to show that the superlubricity was achieved between poly(vinylphosphonic acid) (PVPA)-modified Ti6Al4V and polystyrene (PS) microsphere probe lubricated with monovalent salt solutions (LiCl, NaCl, KCl, and CsCl). Considering that adhesion is an important cause of friction changes, the AFM was further utilized to obtain adhesion between friction pairs in different salt solutions. The results indicated that the larger the cation radius in the lubricant, the smaller the adhesion, and the lower the friction coefficient of the PVPA coating. The electrostatic interaction between the PVPA and one-valence cations in lubricants was analyzed by the molecular dynamics (MD) simulation as it was found to be the main influencing factor of the adhesion. Combined analysis results of friction and adhesion indicated that by adjusting the size of cation radius in lubricant, the adhesion between the tribo-pairs can be changed, and eventually the magnitude of friction can be affected. This study opens up a new avenue for analyzing the friction characteristics of hydrophilic polymer coatings from the perspective of intermolecular forces.

Keywords

atomic force microscopy (AFM)superlubricitypoly(vinylphosphonic acid) (PVPA)cationadhesionmolecular dynamics (MD) simulation

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Friction
Volume 11 Issue 7,
July 2023
Pages 1150-1164
DOI: 10.1007/s40544-022-0632-7
Cite this article:
CAI H, ZHANG C, LI F, et al. Study on the microcosmic superlubricity mechanism of PVPA affected by metal cations. Friction, 2023, 11(7): 1150-1164. https://doi.org/10.1007/s40544-022-0632-7

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Received: 29 March 2021
Revised: 13 July 2021
Accepted: 05 April 2022
Published: 15 August 2022
© The author(s) 2022.

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