ZDDP Tribofilm Formation from a Formulated Oil on Textured Cylinder Liners
Leonardo Cerqueira Dias,Giuseppe Pintaúde,Alessandro Augusto Olimpio Ferreira Vittorino,H.L. Costa +3 more
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TLDR
In this paper , the authors investigated the synergistic effect between surface texturing via Maskless Electrochemical Texturing (MECT) and ZDDP additive on a gray cast iron cylinder liner.Abstract:
Surface texturing can improve lubrication and entrap wear debris but increases the effective roughness of the surfaces, which can induce higher contact pressures. On the one hand, this can be detrimental, but on the other hand, the increase in contact pressure could be used to activate the formation of a ZDDP tribofilm from fully-formulated lubricants. This work investigates the synergistic effect between surface texturing via Maskless Electrochemical Texturing (MECT) and ZDDP additive. The surface texture consisted of an array of annular pockets manufactured on a gray cast iron cylinder liner. These textured surfaces were evaluated by scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDX). The results indicated that surface texturing via MECT changes the chemical composition of the surfaces, by inducing a preferential dissolution of the metal matrix. Consequently, it exposed the carbon present in the material. The tribological performance was evaluated by a ring-on-cylinder-liner tribometer in reciprocating sliding under boundary lubrication conditions using both a base oil and a commercial formulated oil containing ZDDP additive. For comparison, a commercially honed liner was also tested. After the tribological tests, the surfaces were evaluated by white light interferometry and SEM/EDX. Although the textured surfaces showed higher friction, they induced more ZDDP-tribofilm formation than conventional cylinder liner finish.read more
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References
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The History and Mechanisms of ZDDP
TL;DR: In this paper, the authors present a review of the mechanisms of action of the zinc dialkyldithophosphate (ZDDP) additive, concluding that we now know a great deal about the properties and morphology of ZDDP antiwear films, but still relatively little about the reaction pathways that lead to the formation or about the kinetics of ZDP film generation and removal.
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Improving Tribological Performance of Mechanical Components by Laser Surface Texturing
TL;DR: In this paper, a feasibility study was performed both theoretically and experimentally using the Laser Surface Texturing (LST) technique to produce the micro-dimples on their surfaces, which can serve either as a micro-hydrodynamic bearing in cases of full or mixed lubrication.
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