Abstract
Some bis-(aryl/alkyl)thiuram disulphides, bis-(aryl)xanthogens and (aryl/alkyl)dithiocarbamates were synthesized and their extreme pressure (EP) and anti-wear (AW) properties evaluated using a Seta-Shell four-ball lubricant testing machine. Bis-(phenyl)xanthogen, bis-(ethanol)thiuram disulphide, bis-(diethanol)thiuram disulphide, bis-(naphthyl)thiuram disulphide and N,N-diethanol dithiocarbamate were found to be efficient EP additives showing a welding load in the range 315–500 kgf. The coefficient of friction and mean specific pressure were evaluated and their variation with load in the case of different additives explained. No additive was found to posses efficient anti-wear property.
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