Abstract
AbstractZinc and molybdenum dithiocarbamates are used as effective additives in lubricants of various types. Following earlier reported investigations on their antifriction and antiwear properties, it was found that zinc and molybdenum dithiocarbamates had some antioxidant capabilities, so investigations have been carried out to compare the influence of zinc and molybdenum dithiocarbamates and dithiophosphates on the antioxidant properties of lubricating oils over a wide range of temperatures. The antioxidant activity of a number of synthesised additives was determined by a kinetic method in model conditions; the antioxidant properties of these additives were also compared in more severe conditions. It was found that the effectiveness of metal dithiocarbamates depends on the oxidation test conditions. The influence of zinc and molybdenum dithiocarbamates on the antioxidant properties of lubricating oils increases in the presence of zinc dithiophosphate and calcium phenate.
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