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Research Article
Febin Cyriac
Agency for Science Technology and Research
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2428-8769
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Friction, wear and tribofilm growth of organic friction modifiers (glycerol monooleate and oleamide), anti-wear additive (ZDDP) and binary additive system comprising the organic friction modifiers and ZDDP were studied in polyalphaolefin (PAO) and ester oil. The mechanisms underlying base oil polarity-dependent frictional performance of the OFM and AW additives at high temperature (140 oC), either singly or in combination, was investigated in the light of chemical composition analysis of the tribofilms post friction measurements using energy-dispersive X-ray spectroscopy (EDX), static and dynamic time-of-flight secondary ion mass spectrometry (ToF-SIMS). Depending on the rubbing conditions, the boundary friction coefficient of the binary additive systems were found to be either lower than that of individual additives or to lay between the values for the individual additives. Chemical composition analysis of the tribofilms indicated that the nature of base oil controlled interactions between ZDDP and OFM and consequently adsorption and reactive tribofilm formation in the boundary lubrication layer. Surface roughness and wear scar width measured post tribological tests using 3D surface profiler showed improved wear performance in both PAO and ester-based additive formulations.
Keywords
organic friction modifiers, anti-wear additive (ZDDP) ,binary additive system,energy-dispersive X-ray spectroscopy (EDX), lubrication layer.
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CURRENT STATUS: Under Review
Version 1
Posted 12 Apr, 2021
No community comments so far
Editorial decision: Major Revisions Needed
On 13 Apr, 2021
Reviews received
Received 27 Feb, 2021
Reviewers invited
Invitations sent on 25 Feb, 2021
First submitted
On 24 Feb, 2021
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On 24 Feb, 2021
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This preprint is under consideration at Tribology Letters. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Febin Cyriac
Agency for Science Technology and Research
Corresponding Author
ORCiD: https://orcid.org/0000-0003-2428-8769
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Review
Version 1
Posted 12 Apr, 2021
No community comments so far
Editorial decision: Major Revisions Needed
On 13 Apr, 2021
Reviews received
Received 27 Feb, 2021
Reviewers invited
Invitations sent on 25 Feb, 2021
First submitted
On 24 Feb, 2021
Editor assigned
On 24 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Friction, wear and tribofilm growth of organic friction modifiers (glycerol monooleate and oleamide), anti-wear additive (ZDDP) and binary additive system comprising the organic friction modifiers and ZDDP were studied in polyalphaolefin (PAO) and ester oil. The mechanisms underlying base oil polarity-dependent frictional performance of the OFM and AW additives at high temperature (140 oC), either singly or in combination, was investigated in the light of chemical composition analysis of the tribofilms post friction measurements using energy-dispersive X-ray spectroscopy (EDX), static and dynamic time-of-flight secondary ion mass spectrometry (ToF-SIMS). Depending on the rubbing conditions, the boundary friction coefficient of the binary additive systems were found to be either lower than that of individual additives or to lay between the values for the individual additives. Chemical composition analysis of the tribofilms indicated that the nature of base oil controlled interactions between ZDDP and OFM and consequently adsorption and reactive tribofilm formation in the boundary lubrication layer. Surface roughness and wear scar width measured post tribological tests using 3D surface profiler showed improved wear performance in both PAO and ester-based additive formulations.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
Figure 9
Figure 10
Figure 11
Figure 12
Figure 13
Figure 14
This is a list of supplementary files associated with this preprint. Click to download.
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