TRIBOTECHNICAL PROPERTIES OF MOTOR AND INDUSTRIAL OILS WITH COPPER, TIN AND ZINC OLEATES

The purpose of this study is to determine the effect of metal ion on the tribological characteristics of metal oleates similar to copper (II) oleate which is the basis of well-known additives such as Valena, Servovit etc. The objects of study are copper (II), zinc (II) and tin (II) oleates. Salts of these metals are selected to clarify the role of such parameters of metal ion, as the active metal and the radius of the ion. Lubricant compositions were prepared with each additive sample. The mass concentration of the additive was 1% in synthetic motor oil of viscosity class SAE 5W-40 (API SN/CF) and in industrial oil I40A. The influence of metal oleates on the friction coefficient of the friction pair of steel 45-steel 10 was investigated. The friction coefficient was measured on the machine friction II5018 according to the scheme "roller-pad" at different temperatures. The investigated additives have the most significant effect on the coefficient of friction when introduced into the oil without additives and less significantly when introduced into the engine oil. The results show that copper oleate reduces the coefficient of friction in contact by 7% -15% when added to the engine oil. Zinc oleate leads to a similar effect and reduces the coefficient of friction by 5.5% -8.5%. Oleate of tin leads to a decrease in the friction coefficient of 23.5%-31%.