Interactions between a Zinc dialkyldithiophosphate (ZDP) and three different commercially available succinimide dispersants were observed through changes in solutions behavior, as determined by viscometry and Fourier Transform Infrared spectroscopy (FTIR), and four-ball tests.The viscometric response observed for two component blends of ZDP and succinimide dispersant in white oil changed as a function of the molar Zn to N ratio, indicative of specific interactions. The break in the viscometric response curve occurred at Zn:N=0.13 for all three succinimide dispersants. FTIR spectra of the same ZDP-dispersant blends were examined and similar Zn:N dependencies were observed.Four-ball tests measuring wear scar diameter, seizure load and weld load showed a dependence on the Zn to N ratio similar to that observed by viscometry. At very low Zn to N ratios wear and seizure load were decreased, while at higher ratios the seizure and weld loads were increased over that for ZDP alone. These studies show that either ZDP-dispersant complexation and/or competition between the ZDP and the dispersant for the metal surface affects wear as measured by the four-ball test.


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    Title :

    Zinc Dialkyldithiophosphate-Dispersant Interactions: Effects on Solution Behavior and Wear


    Additional title:

    Sae Technical Papers


    Contributors:
    Gundic, D. T. (author) / Fabian, L. E. (author) / Hanna, M. E. (author) / Kulp, M. J. (author)

    Conference:

    International Fuels & Lubricants Meeting & Exposition ; 1992



    Publication date :

    1992-10-01




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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