A study in EP activity evaluation of some new oil-soluble Mo-S complexes

Abstract

0.5% (w/v) solutions of bis(1,5-diaryl-2,4-dithiomalonamido) dioxomolybdenum complexes in paraffin oil were found to reduce significantly wear and friction of the steel balls in a four-ball test. The additive, bis(1,5-di-p-methoxyphenul-2,4-dithiomalonamido) dioxomolybdenum (VI) afforded higher values of initial seizure load (ISL, 112 kgf), 2.5 second seizure delay load (2.5 s SDL, 126 kgf), weld load (WL, >500 kgf), flash temperature parameter (FTP, 296) and mean Hertz load (MHL, 84 kgf) as compared with the plain paraffin oil and a sulphur-phosphorus additive. The tribological end effects were studied by scanning electron microscopy (SEM) and Auger electron spectroscopy (AES) techniques respectively. © 1992.