摘要：The blends of bis(1,5-diaryl-2,4-dithiomalonamido)dioxomolybdenum(VI)
complexes in lithium-base grease are evaluated for their extreme pressure
activity in a “four-ball test” using 12.7 mm diameter alloy steel ball
specimen. The additive, bis(1,5-di-p-methoxyphenyl-2,4-dithiomalonamido)dioxomolybdenum(VI)
and bis(1,5-di-p-chloro-phenyl-2,4-dithiomalonamido)dioxomolybdenum(VI) exhibited lower values
of wear-scar diameter at higher load and higher values of weld load, flash temperature
parameter, and pressure wear index as compared with lithium-base grease without additives. The
greases fortified with the developed additives prevent rusting and corrosion of bearings while
grease containing no additives did not pass these tests as per the standard tests. These greases
have also better oxidation protection as compared to the grease that has no additive. The
topography and tribochemistry of the wear-scar surface are carried out by means of scanning
electron microscopy and Auger electron spectroscopy techniques, respectively.
