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Research Papers: Tribochemistry & Tribofilms

Tribochemical Interactions of Friction Modifier and Antiwear Additives With CrN Coating Under Boundary Lubrication Conditions

[+] Author and Article Information
T. Haque

Institute of Engineering Thermofluids, Surfaces and Interfaces (iETSI), School of Mechanical Engineering, University of Leeds, Leeds, LS 2 9JT, UKt_haque_me@yahoo.com

A. Morina, A. Neville

Institute of Engineering Thermofluids, Surfaces and Interfaces (iETSI), School of Mechanical Engineering, University of Leeds, Leeds, LS 2 9JT, UK

S. Arrowsmith1

Institute of Engineering Thermofluids, Surfaces and Interfaces (iETSI), School of Mechanical Engineering, University of Leeds, Leeds, LS 2 9JT, UK

1

Also at Infineum UK Limited, 1 Milton Hill Abingdon, Oxfordshire, UK.

J. Tribol 130(4), 042302 (Aug 07, 2008) (12 pages) doi:10.1115/1.2961808 History: Received October 16, 2007; Revised April 15, 2008; Published August 07, 2008

In recent years, the optimized use of low friction nonferrous coatings under boundary lubrication conditions has become a challenge to meet the demands of improved fuel economy in automotive applications. This study presents the tribological performance of chromium nitride (CrN) coating using conventional friction modifier (moly dimer) and/or antiwear additive (zinc dialkyl dithiophosphate (ZDDP)) containing lubricants in a pin-on-plate tribometer. Using surface analysis techniques such as the atomic force microscope (AFM) and X-ray photoelectron spectroscopy (XPS), both topographical and chemical analyses of tribofilms were performed. This paper shows that ZDDP and moly dimer both give a positive effect for both low friction and antiwear performance in CrN/cast iron system. Both AFM and XPS analyses give evidence of the formation of ZDDP and moly dimer derived tribofilms on the CrN coating and thus support friction and wear results.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of the arrangement of samples and lubricant in the pin-on-reciprocating plate apparatus

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Figure 2

Friction coefficient as a function of material and lubricant selections

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Figure 3

Dimensional wear coefficients of plates and pins for (a) UC steel/CI and (b) CrN/CI systems

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Figure 4

The surface profile of wear track on the CrN coating given by Oil B1 shows gain of volume

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Figure 5

Roughness of the wear tracks formed on the CrN coated and UC steel plates after the 6h tests for Oils A, B1, and C1

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Figure 6

AFM images of bare surfaces: (a) UC steel and (b) CrN coating

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Figure 7

AFM images of tribofilms formed by Oil A on (a) UC steel and (b) CrN coating

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Figure 8

AFM images of tribofilms formed by Oil B1 on (a) UC steel and (b) CrN coating

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Figure 9

AFM images of tribofilms formed by Oil C1 on (a) UC steel and (b) CrN coating

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Figure 10

XPS peaks of Zn 2p obtained from ZDDP containing oils derives tribofilms—Oil A on CrN plate (i) and CI pin (ii) and Oil C1 on CrN plate (iii) and CI pin (iv)

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Figure 11

Mo 3d curve fitted XPS peaks obtained from moly dimer containing oils derives tribofilms—Oil B1 on CrN plate (i) and CI pin (ii) and Oil C1 on CrN plate (iii) and CI pin (iv)

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Figure 12

XPS peaks for the bridging and nonbridging oxygens in the tribofilms for (a) Oil A and (b) Oil C1

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Figure 13

Schematic diagram for the mechanism of friction and wear: (a) Oil A, (b) Oil B1, and (c) Oil C1

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