Reactivity of oil‐soluble IL with silicon surface at elevated temperature

The reactivity of an oil‐miscible ionic liquid, phosphonium phosphate (PP), and the common anti‐wear additive zinc dialkyl dithio phosphate (ZDDP) with a solid surface at elevated temperature in the absence of any tribological motion is investigated. Understanding the thermal film build up, composit...

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Bibliographic Details
Published in:Lubrication science 2019-06, Vol.31 (4), p.151-162
Main Authors: Al‐Sallami, Waleed, Parsaeian, Pourya, Dorgham, Abdel, Neville, Anne
Format: Article
Language:English
Subjects:
Additives
ATR‐FTIR
Film thickness
Fourier transforms
High temperature
Infrared reflection
Ionic liquids
Ions
Lubrication
Morphology
Organic chemistry
Photoelectron spectroscopy
Photoelectrons
Scanning electron microscopy
SEM‐EDS
Silicon
Solid surfaces
soluble IL
Tribology
X ray photoelectron spectroscopy
XPS and formation of thermal film
ZDDP
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Summary:The reactivity of an oil‐miscible ionic liquid, phosphonium phosphate (PP), and the common anti‐wear additive zinc dialkyl dithio phosphate (ZDDP) with a solid surface at elevated temperature in the absence of any tribological motion is investigated. Understanding the thermal film build up, composition, and relative thickness will help in the understanding of lubrication mechanisms once tribological effects are introduced. Attenuated total reflection–Fourier transform infrared (ATR‐FTIR), scanning electron microscopy–energy dispersive spectroscopy (SEM‐EDS), and X‐ray photoelectron spectroscopy (XPS) are employed to characterise silicon surfaces before and after the experiments in terms of surface chemistry and surface morphology. The results show that both additives react with the silicon surface to produce thermal films. However, ZDDP forms a thicker film. PP reacts with the silicon and forms a thermal film, but the reaction rate is self‐limited such that an increase of time to 24 hours does not significantly increase the film thickness.
ISSN:0954-0075
1557-6833
DOI:10.1002/ls.1456