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Effect of amines on the antiwear properties of P‐containing compounds as oil additives
Author(s) -
Wan Yong,
Liu Weimin,
Ren Tianhui,
Xue Qunji
Publication year - 1994
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.3010060306
Subject(s) - amine gas treating , x ray photoelectron spectroscopy , adsorption , primary (astronomy) , materials science , organic chemistry , chemistry , chemical engineering , physics , astronomy , engineering
This paper reports a study on the effects of concentration and the molecular structure of amines on the antiwear properties of TBP, TCP and TBPi, evaluated with a four‐ball machine. It was found that amines reduce the antiwear properties of P‐containing additives in the order primary>secondary>tertiary amine, and a critical amine concentration exists at which P‐containing additives lose their antiwear properties. XPS analysis indicated that the competitive adsorption of amines onto the rubbed surface causes a reduction of the antiwear properties of P‐containing additives.