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Effect of alkenes on the antiwear mechanism of dialkyl hydrogen phosphites
Author(s) -
Minami Ichiro,
Hong HyunSoo,
Mathur Naresh C.
Publication year - 2001
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.3010130303
Subject(s) - rubbing , squalane , lubricant , hydrogen , boundary lubrication , materials science , cyclohexene , hydrogen bromide , hydrogen phosphate , organic chemistry , chemical engineering , inorganic chemistry , chemistry , metallurgy , phosphate , catalysis , engineering , bromine
The antiwear performances of dialkyl hydrogen phosphites were investigated using a pin‐on‐disc tester under boundary lubrication. Pure phosphites were synthesised, and simple model lubricant systems were used to obtain clear observations. Di(cyclohexyl) hydrogen phosphite in squalane showed excellent antiwear performance, whereas di(n‐hexyl) hydrogen phosphite showed poor performance. Surface analyses were performed, which suggested that: (1) effective antiwear performance was achieved by the formation of a protective film of iron phosphate on the rubbing surface; (2) alkenes were effective in preventing corrosive wear, so better antiwear performance can be achieved when there are alkenes in the solution; and (3) di(cyclohexyl) hydrogen phosphite may undergo pyrolysis to eliminate cyclohexene, which plays an important role in anti‐wear behaviour.