Abstract
Tribochemical interactions between antiwear/antifriction molybdenum dithiophosphate (Modtp) and dispersant amine additives (polyisobutenyl succinimide (PIBSI) and polyisobutenylacetylamine (PIB-Amine)) have been investigated by a coupling friction experiment in a Cameron Plint tribometer and chemical analysis by transmission electron microscopy (TEM), XPS and AES. Antagonist effects have been observed on friction data in the case of the Modtp/PIB-Amine combination in oil. In contrast, friction properties of the Modtp have not been modified in a significant way by adding PIBSI. Both XPS and AES suggest that the addition of PIB-Amine to Modtp has inhibited the formation of the tribofilm, whereas in the case of the addition of PIBSI to Modtp no noticeable change in the film composition was observed. Observation by TEM of wear fragments confirms an inhibition of the formation of the polyphosphate/MoS2 tribofilm when PIB-Amine is used as a detergent-dispersant additive. All the results suggested that the amine plays a fundamental role in inhibiting the Modtp tribofilm formation. The results with PIBSI allow us to conclude that the role of the amine depends either on its ability to form coordination complexes with Mo or on its adsorption properties on metallic surfaces. Copyright © 2000 John Wiley & Sons, Ltd.
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