Effect of Coexistent Additives on the Friction Characteristics and Tribofilm formation of Zinc Dialkyldithiophosphate

Abstract

The major aim of this study is to investigate the tribofilm formation and friction-speed characteristics of ZnDTP in the presence of other lubricant additives. Simultaneous measurement of friction and electrical conductivity were employed using ZnDTP and several kinds of functionally different additives. Several analyses of friction surfaces were also carried out in order to measure the reaction film thickness and investigate the chemical composition of this film. It was demonstrated that the presence of each additive with ZnDTP prevented the formation of a ZnDTP tribofilm and thereby could provide lower friction than ZnDTP alone.

Characterization of the reaction film formed by zinc dialkyldithiophosphate using two different ellipsometric analyses

“…The ZnDTP reaction film studied here was formed using a cylinderon-disk tribometer [21,22]. The upper disk specimen (diameter of 33.5 mm and contact width of 0.85 mm) was rotated against the stationary cylinder specimen (diameter of 10 mm and length of 40 mm) at 20.0 cm/s with an axial load of 143 N. Four kinds of specimens with a sliding distance of 10, 24, 50, and 370 m were prepared.…”