Abstract
The reaction of trimethyl-phosphite, TMPi, with a clean Fe(110) surface has been investigated by ab initio calculations.
Highlights
For the gas phase lubrication (GPL) experiments, once the stabilization of the desired gas partial pressure in the ECT obtained, the friction experiment is started and the coef cient is measured for each reciprocating sliding cycles
We carried out experimental modeling of tribochemical reactions of different organophosphorus compounds by Gas Phase Lubrication
Lubrication with TMPi and dimethyl phosphite (DMPi) gases reduces friction more efficiently than the trimethyl phosphate (TMPa) gas. This friction reduction is correlated with the formation iron phosphide in the tribo lm whereas TMPaderived tribo lm is mainly composed of iron phosphate
Summary
Organophosphorus compounds are important extreme pressure (EP) and anti-wear (AW) additives used in different industrial elds, especially automotive applications.[1,2] While phosphate ester additives were extensively investigated during the last few decades,[3,4,5,6,7,8,9] few studies have been devoted to phosphite compounds despite their increasing use in engine oils,[10,11,12,13,14,15,16] especially for gearbox components. Among the wide variety of phosphite additives used to improve the oil friction reduction performances, the most common ones are triallyl-phosphite, tributyl-phosphite, dilauryl-phosphite, dioleyl-phosphite and triphenyl-phosphite. The chemical structure of these additives greatly in uences the nature of the formed tribo lm and its tribological performances. Riga et al.[16] showed that shorter phosphite chains give better anti-wear performances. This seems to be related to the formation of a tribo lm containing iron phosphide that was identi ed by Barcro 17 as Fe2P on rubbed surfaces lubricated by tricresyl-phosphate (TCP). The lubrication mechanism of TCP was attributed to a polishing action via the formation of an iron/iron phosphide eutectic.[18] In
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