Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication

Abstract Ionic liquids (ILs) have recently been developed as a novel class of lubricant anti-wear (AW) additives, but the formation mechanism of their wear protective tribofilms is not yet well understood. Unlike the conventional metal-containing AW additives that self-react to grow a tribofilm, the...

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Autores principales:	Yan Zhou, Donovan N. Leonard, Wei Guo, Jun Qu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/68e23711992d4c8590d5ee24825691eb
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spelling	oai:doaj.org-article:68e23711992d4c8590d5ee24825691eb2021-12-02T11:41:10ZUnderstanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication10.1038/s41598-017-09029-z2045-2322https://doaj.org/article/68e23711992d4c8590d5ee24825691eb2017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-09029-zhttps://doaj.org/toc/2045-2322Abstract Ionic liquids (ILs) have recently been developed as a novel class of lubricant anti-wear (AW) additives, but the formation mechanism of their wear protective tribofilms is not yet well understood. Unlike the conventional metal-containing AW additives that self-react to grow a tribofilm, the metal-free ILs require a supplier of metal cations in the tribofilm growth. The two apparent sources of metal cations are the contact surface and the wear debris, and the latter contains important ‘historical’ interface information but often is overlooked. We correlated the morphological and compositional characteristics of tribofilms and wear debris from an IL-lubricated steel–steel contact. A complete multi-step formation mechanism is proposed for the tribofilm of metal-free AW additives, including direct tribochemical reactions between the metallic contact surface with oxygen to form an oxide interlayer, wear debris generation and breakdown, tribofilm growth via mechanical deposition, chemical deposition, and oxygen diffusion.Yan ZhouDonovan N. LeonardWei GuoJun QuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yan Zhou Donovan N. Leonard Wei Guo Jun Qu Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
description	Abstract Ionic liquids (ILs) have recently been developed as a novel class of lubricant anti-wear (AW) additives, but the formation mechanism of their wear protective tribofilms is not yet well understood. Unlike the conventional metal-containing AW additives that self-react to grow a tribofilm, the metal-free ILs require a supplier of metal cations in the tribofilm growth. The two apparent sources of metal cations are the contact surface and the wear debris, and the latter contains important ‘historical’ interface information but often is overlooked. We correlated the morphological and compositional characteristics of tribofilms and wear debris from an IL-lubricated steel–steel contact. A complete multi-step formation mechanism is proposed for the tribofilm of metal-free AW additives, including direct tribochemical reactions between the metallic contact surface with oxygen to form an oxide interlayer, wear debris generation and breakdown, tribofilm growth via mechanical deposition, chemical deposition, and oxygen diffusion.
format	article
author	Yan Zhou Donovan N. Leonard Wei Guo Jun Qu
author_facet	Yan Zhou Donovan N. Leonard Wei Guo Jun Qu
author_sort	Yan Zhou
title	Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
title_short	Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
title_full	Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
title_fullStr	Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
title_full_unstemmed	Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication
title_sort	understanding tribofilm formation mechanisms in ionic liquid lubrication
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/68e23711992d4c8590d5ee24825691eb
work_keys_str_mv	AT yanzhou understandingtribofilmformationmechanismsinionicliquidlubrication AT donovannleonard understandingtribofilmformationmechanismsinionicliquidlubrication AT weiguo understandingtribofilmformationmechanismsinionicliquidlubrication AT junqu understandingtribofilmformationmechanismsinionicliquidlubrication
_version_	1718395464913518592

Understanding Tribofilm Formation Mechanisms in Ionic Liquid Lubrication

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