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Tribochemistry & Tribofilms

Tribological Properties of Steel and Steel Lubricated With a Poly-α-Olefin Containing Schiff Base Copper Complex

[+] Author and Article Information
Xinlei Gao1

School of Chemical and Environmental Engineering,  Wuhan Polytechnic University, Wuhan, Hubei Province 430023, People’s Republic of Chinagaox10131@163.com

Jian Li, Wanzhen Gao

 Wuhan Research Institute of Materials Protection, Wuhan, Hubei Province 430030, People’s Republic of China

Li Wu

School of Chemical Engineering and Pharmacy,  Wuhan Institute of Technology, Wuhan, Hubei Province 430074, People’s Republic of China

1

Corresponding author.

J. Tribol 134(3), 032301 (Jun 25, 2012) (8 pages) doi:10.1115/1.4006581 History: Received February 09, 2011; Revised March 13, 2012; Published June 25, 2012; Online June 25, 2012

Poly-α-olefin (PAO) is an important synthetic fluid in the field of industry lubricants. To improve the tribological properties of PAO, a Schiff base copper complex was added to the lubricants. The tribological properties of steel and steel lubricated with PAO and PAOs containing a Schiff base copper complex were studied. The friction and wear properties of steel and steel lubricated with PAO and PAOs containing a Schiff base copper complex were evaluated using a SST-ST pin-disc tester. The sliding friction was measured using lubricants with or without a Schiff base copper complex and analyzed using surface analysis techniques including scanning electron microscopy, Fourier transform infrared spectroscopy, and confocal white light microscopy. A UMT-2 universal tribometer was also used to study the tribological properties of modifying PAO containing the Schiff base copper complex. The Schiff base copper complex structure was found to assist in the formation of a stronger tribofilm; more than the tribofilm prepared by lubricating only with PAO and this is crucial in obtaining a low and stable coefficient of friction. A lower stable friction coefficient and wear was found for the steel/steel surface contact when using the PAOs containing the Schiff base copper complex compared to the samples lubricated with the PAO without additives. The excellent tribological performance of the PAOs containing the Schiff base copper complex is attributed to the formation of a useful tribofilm with organic and inorganic groups on the sliding surface.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Reaction of synthesizing salicylaldehyde-ethylenediamine Schiff base and Cu(II) chelate of bis(salicylaldehyde)ethylenediamine

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Figure 2

Pseudo-ternary phase diagram of TX-100, Span 80/n-butanol-PAO-alcohol (S + AS denotes surfactant/cosurfactant mixture, O denotes PAO, and E denotes alcohol)

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Figure 3

A sketch of the samples in the pin-disk tester. (a) A sketch of the pin, (b) a sketch of the disc, and (c) a sketch of the pin-disc surface contact.

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Figure 4

Friction coefficients as a function of time with steel/steel surface contacts and lubricants in the macroscopic friction tests

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Figure 5

Friction coefficients as a function of time for the steel/steel surface contacts with lubricants in the microscopic friction tests

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Figure 6

Flectional ratio of the surface of the original 100Cr6 steel by FTIR

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Figure 7

Flectional ratio of the 100Cr6 steel surface after immersion in PAO for different times

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Figure 8

Flectional ratio of the 100Cr6 steel surface after immersion in the modified PAO containing 0.5% of the Schiff base copper complex for different times

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Figure 9

Flectional ratio of the 100Cr6 steel surface after immersion in the modified PAO containing 1% of the Schiff base copper complex for different times

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Figure 10

Flectional ratio of the 100Cr6 steel surface after immersion in the modified PAO containing 2% of the Schiff base copper complex for different times

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Figure 11

Schematics of the tribofilm containing the Schiff base copper complex. (a) Schematic of the original steel surface, (b) schematic of the steel surface, which is in contact with the PAO containing the Schiff base copper complex, (c) schematic of the steel surface lubricated with the PAO containing a Schiff base copper complex during the friction process, and (d) schematic of the steel surface lubricated with PAO containing the Schiff base copper complex after the friction process.

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