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    Ultralow friction of copper by a green water-based lubricant containing phytic acid

    Year: 2021

    Journal: J. Mol. Liq., Volume 338, SEP 15

    Authors: Chen, Wenhao; Fu, Xiaojing; Cao, Lei; Gao, Shuai; Wan, Yong

    Organizations: National Natural Science Foundation of China [51975304]; Shandong Provincial Natural Science Foundation [ZR2019MEE016]

    Keywords: Ultralow friction; Water-based lubricant; Phytic acid; Copper

    Water can be used as an ecological lubricant base if the water-based lubricant additives are properly developed to enhance its tribological properties. Moreover, those additives should be friendly to both human and nature. Inositol hexakisphosphoric acid (IP6), known as phytic acid, is biodegradable and non-toxic and widely used in food industrial. We focus here on understanding the lubrication of copper by IP6 aqueous solution. A pin-on-disk tester is used to investigate the lubrication performance of using IP6 aqueous solution under boundary lubrication condition. Lower friction coefficient of 0.03 is obtained when 20 wt% IP6 solution is used. The tribofilms are characterized by using X-ray photoelectron spectroscopy. The results indicate that the surface hydrate tribofilms from adsorption of IP6 molecules on the copper surface provides excellent lubrication performance. (C) 2021 Elsevier B.V. All rights reserved.
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