Effect of dodecyl amine on the antiwear property of S-containing organic borates as oil additives

Two sulfur-containing organic borates were prepared. The antiwear property of white oil and n-tetradecane, into which these borates were added, and the effect of dodecyl amine on antiwear property of the synthesized borates were measured by using a four-ball tester and a ring-block tester. The X-ray photoelectron spectroscopy (XPS) was used to examine the rubbed surfaces of the test blocks. It was found that the addition of dodecyl amine can significantly increase both the load-carrying capacity and anti-wear property of S-containing organic borates. The XPS analysis indicated that sulfur on the rubbed surfaces exists in the forms of organic sulfide and FeSO₄, and the addition of amine reduces the adsorption and reaction of sulfur to the rubbing surfaces.