Abstract
The study aim is to develop methods of efficiency enhancement for the antiwear additives in the lubricants based on hydrocarbon oils. The tribological properties of triaryl and trialkyl phosphorothionates with similar hydrocarbyl groups have been compared. The testing has been carried out in the contact unit of combined rolling and sliding friction. It has been shown that trioctyl phosphorothionate is considerably superior to tribenzyl phosphorothionate and triphenyl phosphorothionate in antifriction and antiwear properties. The obtained results validate the suggestion that for a given polar group contained in an antiwear additive molecule the maximal efficiency can be achieved with sufficiently great hydrocarbonyl groups, when their structures are similar to the prevailing structure of the lubricant hydrocarbon molecules.
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