The paraffin oil admixtures with some Mo-S complexes were evaluated as potential EP lubricant additives in the ‘four-ball test’ using 12.7 mm diameter steel balls of different compositions. The oil-soluble additive, bis(oxinato)-μ-oxo-μ-sulphido-dioxomolybdenum (V), was found to be quite effective against the steel balls of different compositions. The tribochemistry and topography of the used ball specimens were examined by means of scanning auger electron spectroscopy and scanning electron microscopy respectively.
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