Cen, H, Morina, A orcid.org/0000-0001-8868-2664 and Neville, A orcid.org/0000-0002-6479-1871 (2019) Effect of base oil polarity on the micropitting behaviour in rolling-sliding contacts. Lubrication Science, 31 (4). pp. 113-126. ISSN 0954-0075
Abstract
An automated micropitting test rig that uses the proven three-point contact configuration was applied to study the effect of base oil polarity on micropitting behaviour in rolling-sliding contacts. The tribological tests using one polar (ester) and one non-polar (polyalpha olefin [PAO]) base oil mixed with four different additives were first done in a micropitting rig to study the friction, wear, and micropitting performance. The tested specimen after tribological tests were examined by an optical microscope to study the micropitting on the surface. The X-ray photoelectron spectroscopy (XPS) was applied to obtain the related tribochemical information from the reaction layer. The results showed that higher wear and less micropits formed when testing with ester-based lubricants. This was related to the higher affinity to the steel surface of polar base oil molecules that can compete with additives to attach to the surface, resulting in a thinner reaction layer and shorter chain phosphates.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019 John Wiley & Sons, Ltd. This is the pre-peer reviewed version of the following article: Cen, H, Morina, A and Neville, A (2019) Effect of base oil polarity on the micropitting behaviour in rolling-sliding contacts. Lubrication Science, 31 (4). pp. 113-126. ISSN 0954-0075, which has been published in final form at https://doi.org/10.1002/ls.1453. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. |
Keywords: | Base oil polarity; phosphate chain length; reaction layer thickness; wear; XPS |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mechanical Engineering (Leeds) > Institute of Functional Surfaces (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 04 Apr 2019 10:08 |
Last Modified: | 28 Feb 2020 01:38 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/ls.1453 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:144453 |