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Title: Antiwear properties of Binary Ashless Blend of Phosphonium Ionic Liquids and Borate Esters in Fully Formulated Oil (no Zn)

Abstract

In this study, interaction of ionic liquid (IL) and borate esters (SBs) as antiwear (AW) additives with steel surfaces in tribological contacts was examined using blends which contained no prior AW additives but all the other ingredients present in a fully formulated engine oil. In detail, low phosphorus oil blends were prepared by adding trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate (P_DEHP) at 700ppm phosphorus and 2-methoxy-4,4,6-trimethyl-1,3,2-dioxaborinane or trimethoxyboroxine at 200ppm boron treat rate to a partially formulated oil. The tribological properties of these novel ionic liquid (IL) additive and IL+SB additive mixtures were compared with those of zinc dialkyldithiophosphate (ZDDP) at equal phosphorus levels in the oil blends. Tribological experiments with a reciprocating cylinder on flat contact revealed that both P_DEHP and binary mixtures of P_DEHP+SB offer superior wear protection than ZDDP and the partially formulated oil without AW additives, expressed by a wear reduction of minimum 50%. X-ray absorption near edge structure spectroscopy (XANES) analysis revealed that tribologically formed films are primarily composed of calcium phosphate for oils with AW additives. The interaction of P_DEHP with SB results in additional boron oxide/boric acid and to some extent boron phosphate domains incorporated into the tribofilms.

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE) - Office of Vehicle Technologies (VTO); Natural Sciences and Engineering Research Council of Canada (NSERC); U. S. Nuclear Regulatory Commission (NRC)
OSTI Identifier:
1530876
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Tribology Letters
Additional Journal Information:
Journal Volume: 67; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
XANES; borate esters; fully formulated oils; ionic liquids; wear

Citation Formats

Sharma, Vibhu, Doerr, Nicole, Erdemir, Ali, and Aswath, Pranesh B. Antiwear properties of Binary Ashless Blend of Phosphonium Ionic Liquids and Borate Esters in Fully Formulated Oil (no Zn). United States: N. p., 2019. Web. doi:10.1007/s11249-019-1152-0.
Sharma, Vibhu, Doerr, Nicole, Erdemir, Ali, & Aswath, Pranesh B. Antiwear properties of Binary Ashless Blend of Phosphonium Ionic Liquids and Borate Esters in Fully Formulated Oil (no Zn). United States. doi:10.1007/s11249-019-1152-0.
Sharma, Vibhu, Doerr, Nicole, Erdemir, Ali, and Aswath, Pranesh B. Sat . "Antiwear properties of Binary Ashless Blend of Phosphonium Ionic Liquids and Borate Esters in Fully Formulated Oil (no Zn)". United States. doi:10.1007/s11249-019-1152-0.
@article{osti_1530876,
title = {Antiwear properties of Binary Ashless Blend of Phosphonium Ionic Liquids and Borate Esters in Fully Formulated Oil (no Zn)},
author = {Sharma, Vibhu and Doerr, Nicole and Erdemir, Ali and Aswath, Pranesh B.},
abstractNote = {In this study, interaction of ionic liquid (IL) and borate esters (SBs) as antiwear (AW) additives with steel surfaces in tribological contacts was examined using blends which contained no prior AW additives but all the other ingredients present in a fully formulated engine oil. In detail, low phosphorus oil blends were prepared by adding trihexyltetradecylphosphonium bis(2-ethylhexyl)phosphate (P_DEHP) at 700ppm phosphorus and 2-methoxy-4,4,6-trimethyl-1,3,2-dioxaborinane or trimethoxyboroxine at 200ppm boron treat rate to a partially formulated oil. The tribological properties of these novel ionic liquid (IL) additive and IL+SB additive mixtures were compared with those of zinc dialkyldithiophosphate (ZDDP) at equal phosphorus levels in the oil blends. Tribological experiments with a reciprocating cylinder on flat contact revealed that both P_DEHP and binary mixtures of P_DEHP+SB offer superior wear protection than ZDDP and the partially formulated oil without AW additives, expressed by a wear reduction of minimum 50%. X-ray absorption near edge structure spectroscopy (XANES) analysis revealed that tribologically formed films are primarily composed of calcium phosphate for oils with AW additives. The interaction of P_DEHP with SB results in additional boron oxide/boric acid and to some extent boron phosphate domains incorporated into the tribofilms.},
doi = {10.1007/s11249-019-1152-0},
journal = {Tribology Letters},
number = 2,
volume = 67,
place = {United States},
year = {2019},
month = {6}
}