The effect of aromatic hydrocarbons in lubricant base oils on the efficiency of adsorptive additives

Abstract

This paper describes a study of the effect of aromatics in lubricant base oils on the efficiency of adsorptive additives in terms of lubrication and rust-inhibition performance. The additives investigated were sulphurised isobutylene, tricresyl phosphate (TCP), sorbitol monooleate (Span-80), and alkylene succinic acid. Four-ball friction and wear tests, a modified ASTM D 665 rust test, an electrochemical test, and Xray photoelectron spectroscopy f l P S ) were used to reveal the relationship between the aromatics and the additives. The results show that the aromatic hydrocarbons in the base oils reduce the surface activity of the additives; competitive adsorption between the polar compounds and the additives is not a key factor governing the behaviour of the additives under the test conditions.

Effect of Solvent Cation Alkyl-Chain Length on the Separation of Butylbenzene from n-Tetradecane Using Hexafluorophosphate-Based Ionic Liquids at (313.15 and 333.15) K and 101.3 kPa

“…Similarly, increasing aromatics content in high cetane diesel fuels results in high NO x and particulate emissions . Also, aromatics hydrocarbons in lubricating oils reduces the surface activity of additives used for lubrication and rust inhibition . Conventional removal of aromatics involves the use of solvents such as sulfolane, dimethylformamide (DMF), and N -methyl-2-pyrrolidone (NMP).…”