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Synthesis of molybdenum polyisobutenyl succinate (MoPIBS) and a study of its tribological characteristics
Author(s) -
Fu S. F.,
Tao D. H.,
Zhang J. H.
Publication year - 2004
Publication title -
lubrication science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.632
H-Index - 36
eISSN - 1557-6833
pISSN - 0954-0075
DOI - 10.1002/ls.3010170105
Subject(s) - x ray photoelectron spectroscopy , tribology , auger electron spectroscopy , molybdenum , materials science , boundary lubrication , lubrication , chemical engineering , metallurgy , composite material , physics , nuclear physics , engineering
In view of the increasing awareness of the need for environmental protection, it is considered important to have more low‐ or non‐phosphorus additives in engine oils. To this end, molybdenum polyisobutenyl succinate (MoPIBS) was synthesised and its structure investigated using spectroscopy. The antiwear and friction‐reducing behaviour of MoPIBS as an oil additive was investigated and compared to that of zinc dialkyldithio‐phosphate (ZnDDP) using a four‐ball tester. The results indicated that MoPIBS in white oil exhibits very good antiwear and friction‐reducing properties, better than those of ZnDDP, but that the load‐carrying capacity is poorer than that of ZnDDP. The worn surfaces were investigated using Auger electron spectroscopy (AES) and X‐ray photoelectron spectroscopy (XPS). It was found that the boundary lubrication film on the worn surfaces was mainly composed of MoO 3 and Fe 2 O 3 , which contributed to improving the tribological properties of MoPIBS as an additive in white oil.