The Slow-Speed Frictional Behavior of Some Lubricant Additive Type-Substances

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Abstract
The slow-speed frictional behavior of white oil solutions of stearic acid and of lauric acid was found to be in accord with established concepts of film formation and in quantitative agreement with reliable results already in the literature. The shape of the speed-dependent friction function of decalin solutions of triphenyl phosphate and of diphenyl phosphate was similar to that for the fatty acids, but numerically the coefficients of friction for the phosphate esters were higher. There was evidence for both an acidity effect and a film effect in the action of the phosphates. Di-t-octyl disulfide, di-t-octyl tetrasulfide and t-octyl chloride were associated with stick-slip friction only. The relation between antiseizure in extreme-pressure lubrication and the frictional behavior for these substances is discussed.
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