Abstract
The bonded MoS2 solid lubricant coating is an effective measure to mitigate the fretting wear of AISI 1045 steel. In this work, the amino functionalized MoS2 was protonated with acetic acid to make the MoS2 positively charged. The directional arrangement of protonated MoS2 in the coating was achieved by electrophoretic deposition under the electric field force. The bonded directionally aligned MoS2 solid lubricant coating showed high adaptability to various loads and excellent lubrication performance under all three working conditions. At a load of 10 N, the friction coefficient and wear volume of the coating with 5 wt% protonated MoS2 decreased by 20.0% and 37.2% compared to the pure epoxy coating, respectively, and by 0.07% and 16.8% than the randomly arranged MoS2 sample, respectively. The remarkable lubricating properties of MoS2 with directional alignment were attributed to its effective load-bearing and mechanical support, barrier effect on longitudinal extension of cracks, and the formation of a continuous and uniform transfer film.
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Acknowledgements
The authors appreciate the financial support of National Natural Science Foundation of China (Nos. 52075458 and U2141211) and Sichuan Science Foundation for Distinguished Young Scholars (2023NSFSC1957). Thanks the Analytical and Testing Center of Southwest Jiaotong University for support of the scanning electron microscopy (SEM) and Raman measurements.
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The authors have no competing interests to declare that are relevant to the content of this article. The author Minhao ZHU is the Editorial Board Member of this journal.
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Liangliang XIONG. She received her bachelor and Ph.D. degrees in materials physics and chemistry in 2014 and 2020, respectively, from School of Material Science and Engineering at Beihang University. Recently, she is an assistant professor at Southwest Jiaotong University. Her research are mainly two-dimensional lubricating material, fretting wear, and corrosion and protection of materials.
Mengxue WU. She is currently a master candidate at School of Materials Science and Engineering, Southwest Jiaotong University. Her research interests include the tribological properties of lubricating additives and corrosion protection performance of organic coatings.
Xiaoqiang FAN. He received his bachelor degree in 2011 from Qingdao University of Science & Technology and Ph.D. degree from Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences in 2016. He is currently a professor at Southwest Jiaotong University. His research focuses on lubricating materials, corrosion protection, and engineering applications. He has published over 110 papers in international journals, which received more than 1,300 citations.
Minhao ZHU. He received his bachelor and master degrees from Southwest Jiaotong University in 1990 and 1993, respectively. Then he has been working in Southwest Jiaotong University. From 1996 to 2001, he pursued his Ph.D. degree from Southwest Jiaotong University. His current position is a professor and doctoral supervisor. His research areas cover fretting wear, fretting fatigue, surface engineering, and design of fastener connection. He has published over 400 papers in international journals such as Carbon, Tribology International, Surface & Coatings Technology, Tribology Letters, Wear, and Friction, etc., which received more than 1,000 citations.
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Xiong, L., Wu, M., Fan, X. et al. Study on the preparation and fretting behavior of bonded oriented MoS2 solid lubricant coating. Friction (2024). https://doi.org/10.1007/s40544-024-0895-2
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DOI: https://doi.org/10.1007/s40544-024-0895-2