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Electrostatic accumulation at the oil-lubricated interface may cause electrostatic adsorption of impurities and oil aging. However, there are still great challenges in terms of the triboelectric mechanism and electrostatic regulation under the oil lubrication state. Under poly-α-olefin 4 (PAO 4) lubrication, the electrostatic accumulation at the interface is serious (−1,873 V), which can be attributed to the inhibitory effect of lubricating oil on the transfer film and electrostatic breakdown in interfacial air. When sorbitan monostearate (Span 60) was added to PAO oil, the surface potential of polytetrafluoroethylene (PTFE) was significantly reduced because the adsorption of Span 60 inhibited electron transfer at the interface. This study reveals the triboelectric mechanism under oil lubrication from a tribological perspective and offers new strategies for electrostatic protection of oil-lubricating interfaces.

This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).
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