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preprint ZDDP AS.pdf (3.38 MB)
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Structure and Formation of Soot Particles from Tribofilm Decomposition Under Real Engine Conditions

preprint
submitted on 08.09.2020 and posted on 09.09.2020 by Thomas Thersleff, Istvan Zoltan Jenei, Serhiy Budnyk, Nicole Dörr, Adam Slabon
Lubrication of an internal combustion engine is critical for unwanted energy and material losses. Zinc dialkyldithiophosphate (ZDDP) is a commonly used anti-wear additive that forms by in situ decomposition a protecting interface between sliding surfaces. The interface consists of the tribofilm on both surfaces and oil in the contact. Soot particles from a petrol engine and gas engine were analyzed using X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) techniques: electron energy loss spectroscopy (EELS) and energy dispersive X-ray spectroscopy (EDS). These techniques revealed that the end-products in soot contain 3-5 nm ZnO-based particles with additions of phosphorus and sulfur, originating from the ZDDP anti-wear additive. Our results unravel the tribofilm decomposition under real field conditions and hint toward potentially unidentified hazards with respect to ZDDP-containing lubricants.

Funding

MISTRA SafeChem

N.D. thanks: COMET InTribology (FFG no. 872176, project coordinator: AC2T research GmbH).

History

Email Address of Submitting Author

adam.slabon@mmk.su.se

Institution

Stockholm University

Country

Sweden

ORCID For Submitting Author

0000-0002-4452-1831

Declaration of Conflict of Interest

no conflict to declare

Version Notes

version 1.0

Exports