Study on the effect of water contamination on zinc Dialkyldithiophosphate (ZDDP) additive in lubricant

Arbain, Nurul Afiqah (2021) Study on the effect of water contamination on zinc Dialkyldithiophosphate (ZDDP) additive in lubricant. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Water has long been identified as the most destructive lubricant contaminant. It can have a significant impact on wear performance, particularly in bearing systems. The lubricant that exposed to water contaminant can gives an adverse effect on the base oil, additive contain and also cause the lubrication system failure. Zinc Dialkyldithiophosphate (ZDDP) is an anti-wear additive that are added into lubricant to improve the surface contact especially surface under sliding contact by the growth of tribofilm layer. The existence of water or moisture from humid environment into the lubrication system can interrupt the development of tribofilm layer. The effect of water on bulk properties of the lubricant in terms of viscosity, Total Acid Number and physical appearance were also investigated. The comparative study was conducted in determining the effect of water on the tribofilm thickness and wear depth under sliding contact condition. The aim of this study is to validate the findings on the sequence of wear generated due to the presence of water in the lubricant.

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