Research described in this work relates to tribological properties of fatty acids and aims at providing more information on better understanding of the wear process in the presence of low-sulphur diesel fuels containing these substances at low concentration under boundary lubrication conditions. Experiments were carried out in steel-steel system using ball-on-disc machine. To get detailed information on interactions of diesel fuel components with fatty acids, model hydrocarbons and low-sulphur diesel fuel cuts were used as hydrocarbon bases. Although the overall picture of obtained results is very complex, it can be concluded that: (a) antiwear properties of fatty acids are controlled by carboxylates generated during friction; (b) tribooxidation products of the hydrocarbon base are formed in the tribological system and take part in processes on friction surface; (c) 'prowear' behaviour of fatty acids (appearing at some concentration of fatty acid in n-hexadecane) is the result of intermolecular interactions that prevent participation of fatty acid monomers and hydrocarbon tribooxidation products in triboreactions; (d) antiwear properties of fatty acids used as lubricating additives in diesel fuels depend on chemical constitution of hydrocarbon base; (e) fatty acids added to low-sulphur diesel fuels show excellent antiwear properties.
Diesel fuel lubricity - A review
2003
16 Seiten, 15 Bilder, 6 Tabellen, 42 Quellen
Conference paper
English
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