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• W4386827369 endingPage "158419" @default.
• W4386827369 startingPage "158419" @default.
• W4386827369 abstract "Zinc dialkyldithiophosphates (ZDDPs) have been commonly used as anti-wear additives in the automotive industry for the past 80 years. Despite their widespread use, a general agreement on their primary functioning mechanism is still lacking. The morphology and composition of the ZDDPs phosphate-based tribofilm, which is essential for its lubricant functioning, have been widely studied experimentally. However, the formation process and the relevant driving forces are still largely debated. In particular, it is unclear whether the stress-induced molecular dissociation occurs in the bulk oil or on the substrate. In this work, we employ ab initio density-functional theory simulations to compare ZDDP fragmentation in vacuum and over a reactive substrate, considering the effects of surface oxidation on the dissociation path. To do so, we developed a computational protocol to study the effects of shear stress on molecules. Our results show that the molecular dissociation is endothermic in the absence of a supporting substrate, while in the presence of an iron substrate, it becomes highly energetically favoured. Moreover, the presence of the substrate changes the reaction path, inducing the detachment of organophosphorus units from Zn-S ones. At the same time, surface oxidation reduces the molecule–substrate interaction. These findings provide valuable insights into the early stages of the formation of phosphate-based tribofilms." @default.
• W4386827369 created "2023-09-19" @default.
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• W4386827369 date "2024-01-01" @default.
• W4386827369 modified "2023-10-02" @default.
• W4386827369 title "Zinc dialkyldithiophosphates adsorption and dissociation on ferrous substrates: An ab initio study" @default.
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• W4386827369 doi "https://doi.org/10.1016/j.apsusc.2023.158419" @default.
• W4386827369 hasPublicationYear "2024" @default.
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