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The Antiwear Effectiveness of Micellar Zinc Phosphates and Copper Oxide Through Friction-Induced Cross-Linking

Pawlak, Zenon, Kosse, Vladis, Oloyede, Adekunle, Rauckyte, Teresa, Kopkowski, Andrzej, Hargreaves, Douglas J., Pai, Raghuvir B., & Macintosh, David (2006) The Antiwear Effectiveness of Micellar Zinc Phosphates and Copper Oxide Through Friction-Induced Cross-Linking. In Hargreaves, Douglas J., Kosse, V., & Tan, A. (Eds.) Austrib 06 - International Tribology Conference, 3 - 6 December 2006, Brisbane.

Abstract

Effectiveness of micellar copper oxide and zinc phosphates as antiwear additives in mineral oil has been investigated as a function of their disintegration in tribochemical processes. The use of copper tribofilm coating can provide reasonable very low wear and friction coefficient. The mechanism of wear reduction by micellar copper oxide is based on the formation of metallic copper durable film on the rubbing steel surface during following tribochemical reaction: Cu2+ + 2etribo -> Cu0. This phenomen is named selective transfer. As an effect of the given above reaction, decrease in the concentration of copper and of the other metals, e.g., iron, in oil formulation is observed. Other process responsible for formation of metallic copper is proposed: 2Fe+2 (or Fe0) + 3CuO + 2H2O -> Fe2O3 + 3 Cu0 + 4H+. Zinc phosphates as micellar [Zn(PO3)2] hardcore reverse micelles (RMs) are directly introduced in the sliding contact and undergo physicochemical changes during the film build-up. Consequently, tribochemical reaction with zinc phosphate RMs and iron oxide, through friction-induced cross-linking processes, takes place: [Zn(PO3)2l(RMs) + 2FeO -> Fe2Zn(PO4)2

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ID Code: 10908
Item Type: Conference Paper
Additional URLs:
Keywords: Friction induced cross linking, lubrication
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Mechanical Engineering not elsewhere classified (091399)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Copyright Owner: Copyright 2006 (please consult author)
Deposited On: 27 Nov 2007
Last Modified: 29 Feb 2012 23:22

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