The friction and wear behavior of ZP additive is investigated as an alternative to ZDDP (poisonous for catalyst-based emission control systems). The effect of temperature (25°C and 100°C), of load (200 N and 320 N) and the wear kinetics (5 min and 60 min experiments) were studied. Physico-chemical characterization of the wear tracks were performed by XPS. A protection against wear even at ambient temperature was found. This feature was attributed to the presence of zinc polyphosphate in the tribofilm.

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