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Friction and wear behaviour of liquid paraffin containing an S‐P type additive and amine

Sulphurised olefin (SO) and dibutyl phosphite (DBP) are two popular antiwear and extreme‐pressure additives for gear oils. Investigation of the effects of the weight ratio of SO to DBP in liquid paraffin, and the effects of dodecyl amine, on the friction and antiwear properties of oil, were conducted with a four‐ball wear tester. The chemical composition of the film, formed was examined using X‐ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and reflecting infrared spectro‐scopic (IR) microscopy.