Research Papers: Technical Briefs

Studies on Lanthanum Complexes of 1-Aryl-2,5-Dithiohydrazodicarbonamides in Paraffin Oil as Extreme Pressure Lubrication Additives

[+] Author and Article Information
R. B. Rastogi

e-mail: rashmi.apc@itbhu.ac.in

D. Tiwary

Department of Applied Chemistry,
Indian Institute of Technology,
Banaras Hindu University,
Varanasi, 221005, India

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the Journal of Tribology. Manuscript received September 1, 2012; final manuscript received May 28, 2013; published online July 3, 2013. Assoc. Editor: Hong Liang.

J. Tribol 135(4), 044502 (Jul 03, 2013) (6 pages) Paper No: TRIB-12-1143; doi: 10.1115/1.4024751 History: Received September 01, 2012; Revised May 28, 2013

Testing of lanthanum complexes of 1-aryl-2,5-dithiohydrazodicarbonamides of the formula LaL3 [LH=1-phenyl-2,5-dithiohydrazodicarbonamide(PhTHC), 1-methylphenyl-2,5-dithiohydrazodicarbon-amide(p-MePhTHC), 1-methoxyphenyl-2,5-dithiohydrazodicarbonamide(p-MeOPhTHC), 1-phenyl-2,5-dithiohydrazodicarbonamide(p-ClPhTHC)] for their application as extreme pressure lubrication (EPL) additives was performed on four ball tester using steel balls of 12.7 mm diameter and MoS2 as reference additive. The efficiency of the complexes has been evaluated using the tribological parameters, wear scar diameter, friction coefficient, initial seizure load, 2.5 s seizure delay load, weld load, mean Hertz load, flash temperature parameter and pressure wear index. The tested complexes behave as good extreme pressure additives; however, the best performance is shown by the p-methoxyphenyl derivative. The surface morphology of the wear scar on steel ball has been studied by atomic force microscopy and scanning electron microscopy. In presence of this complex, roughness of the worn surface is significantly reduced. The composition of wear scar has been analyzed by energy dispersive X-ray spectroscopy. The presence of lanthanum and sulfur in energy dispersive X-ray spectrum emphasizes role of additive in the tribofilm formed on the surface.

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Fig. 1

(a) Photograph of four-ball lubricant tester at operating condition. (b) An enlarged view of four-ball rig (schematic representation).

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Fig. 2


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Fig. 3

Effect of load on wear scar diameter in paraffin oil with or without additive

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Fig. 4

Effect of applied load on friction coefficient with or without additives

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Fig. 5

Effect of applied load on specific mean pressure with or without additives

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Fig. 6

Two dimensional and three dimensional AFM images in presence of additive [La(p-MeOPhTHC)3] at different loads: (a,b); ISL 980 N, (c,d) 2.5 s SDL 1098 N (e.f) JBWL 4900 N

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Fig. 7

Scanning electron micrograph of wear scar produced in presence of [La(p-MeOPhTHC)3] at different magnifications: (a,b) ISL 980 N, (c,d) 2.5 s SDL 1098 N, and (e,f) JBWL 4900 N

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Fig. 8

EDX Spectrum of the worn steel surface lubricated with 0.5% w/v concentration [La(p-MeOPhTHC)3] at 2.5 s SDL(1098 N)



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