The influence of chemical structure of certain nitrogen‐containing organic compounds on their antiwear effectiveness: The critical role of hydroxy group

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Abstract
Certain nitrogen compounds and their derivatives used as antiwear additives in base stocks have been tested on a four‐ball machine and an HQ‐1 tester for their relative antiwear effectiveness. The preliminary results indicate that the heterocyclic nitrogen compounds, in general, have a beneficial effect on the antiwear performance of base stocks. Hydroxy groups involved in some nitrogen‐containing compounds have been found to improve their antiwear performance significantly. In particular, one of the hydroxy‐substituted benzothiazoles is most effective in wear reduction and anti‐scuffing. However, the beneficial effect of a hydroxy group has not been observed for short‐chain amines.