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XANES characteristics of tribofilms generated by dithiophosphate additive in water at different test temperatures and durations
Author(s) -
Ma Haibing,
Qiao Rui,
Li Yilin,
Chen Huan,
Ren Tianhui
Publication year - 2009
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.3092
Subject(s) - xanes , tribology , materials science , x ray photoelectron spectroscopy , scanning electron microscope , adsorption , layer (electronics) , absorption of water , absorption (acoustics) , metallurgy , chemical engineering , composite material , spectroscopy , chemistry , organic chemistry , physics , quantum mechanics , engineering
Water‐based lubricants and metal‐working fluids are becoming more and more popular in modern manufacturing due to environmental concerns. Owing to the poor lubricating properties offered by pure water, additives are generally needed to improve the antiwear and extreme pressure properties. In the present work, the tribological behaviors of synthesized additives in water‐based lubricants are studied for different durations and temperatures by a four‐ball machine, and the worn surfaces were analyzed by scanning electron microscopy (SEM) and X‐ray absorption near‐edge structure (XANES) spectroscopy. It was found that the tribological properties changed with the duration and temperature, and the tribofilms mainly consisted of an adsorbed layer and a tribochemical layer. The compositions of tribofilms also changed with duration and temperature, and the different compositions of tribofilms would result in different tribological properties accordingly. Copyright © 2009 John Wiley & Sons, Ltd.