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Effect of base oil polarity on micro and nano friction behaviour of base oil +ZDDP solutions
Vienna University of Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Vienna University of Technology.
SKF Engineering & Research Center, Nieuwegein.
2009 (English)In: 3rd Vienna International Conference on Nano-Technology: March 18-20, 2009; Vienna, Austria / [ed] Wilfried J. Bartz, Wien: Österreichische Tribolog. Ges., , 2009, 98-102 p.Conference paper (Refereed)
Abstract [en]

Ball-on-disc tribo tests and atomic force microscopy (AFM) were used to analyze the effect of base oil polarity on the friction behaviour of steel-steel contacts lubricated with base oil + zinc dialkyldithiophosphate (ZDDP) solutions. Understanding the lubrication properties of the first chemisorbed layer of additives on work pieces yields important information for the optimization of lubrication in various solutions, in particular with regard to the type of additive and amount needed.To characterize the influence of oil polarity, two reference base oils (hexadecane - non polar and diethylenglycol - polar) were blended with different concentrations of ZDDP-C4, and the solutions were tested. A monolayer of base oil/additive solution is deposited on an ASI 52100 steel plate and is scanned on AFM contact mode under several rubbing time and applied load conditions.An AFM technique is developed to estimate microscopic values of friction coefficients showing how the oil polarity contributes to the differences in friction behaviour of the solution due to the addition of ZDDP. With different base oils (hexadecane - non polar base oil and diethylenglycol - polar oil) we observed a significant different of friction behaviour (in micro scale and nano scale) due to the addition of ZDDP compared to the base oil alone. This observation may be attributed to the contribution of base oil to transport the ZDDP additive onto the surface that will be discussed in more detail below. This results display the importance of base oil polarity on the friction behaviour of formulated lubricants containing additives.

Place, publisher, year, edition, pages
Wien: Österreichische Tribolog. Ges., , 2009. 98-102 p.
Research subject
Machine Elements
URN: urn:nbn:se:ltu:diva-34756Local ID: 909834a0-e9b5-11de-bae5-000ea68e967bISBN: 978-3-901657-32-0OAI: diva2:1008007
Vienna International Conference on Nano-Tribology : 19/03/2009 - 20/03/2009
Godkänd; 2009; 20091215 (aldara)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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