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Research Papers: Lubricants

The Tribological Study of Novel Benzotriazolyl-Containing Anticorrosive Polysulfides in Rapeseed Oil

[+] Author and Article Information
Jing Li, Hua Wu

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R.C.

Tianhui Ren1

School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240, P.R.C.thren@sjtu.edu.cn

1

Corresponding author.

J. Tribol 131(1), 011801 (Dec 03, 2008) (6 pages) doi:10.1115/1.2991125 History: Received April 19, 2008; Revised July 24, 2008; Published December 03, 2008

Two novel benzotriazolyl-containing polysulfides were synthesized as a part of the efforts of molecular design. The tribological properties of the synthetic products as additives in rapeseed oil were evaluated using a four-ball machine and compared with that of diiso-butylpolysulfides (DIBPS). The copper corrosion-inhibiting performance and thermal stabilities of the additives were explored as well. The results showed that the synthetic heterocyclic polysulfides had better corrosion-inhibiting properties and thermal stability than the DIBPS. Moreover, the heterocyclic polysulfide additives can improve extreme pressure properties of rapeseed oil as well as antiwear and friction-reducing abilities. However, compared with DIBPS, the heterocyclic polysulfide additives showed a little weaker performance. Tribofilms were investigated by means of scanning electron microscopy and X-ray photoelectron spectroscopy. Surface analysis indicated that the benzotriazolyl-containing polysulfides experienced tribochemical reactions with the rubbing steel surface to generate FeS and FeS2, which together with the chemically absorbed organic N-containing species formed a surface protective film and hence significantly reduce wear of the steel-steel frictional pair. The titled synthetic compounds could be used as promising environmentally friendly multifunctional lubricating additives.

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Figures

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Figure ch1

Synthesis route of the additive

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Figure 1

The maximum nonseizure loads of various lubricants (four-ball machine, rotary speed of 1450 rpm, 10 s)

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Figure 2

Variation in WSD of lower steel balls with additive concentration (four-ball machine, 392 N, rotary speed of 1450 rpm, duration of 30 min)

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Figure 3

Variation in the friction coefficient with additive concentration (four-ball machine, 392 N, rotary speed of 1450 rpm, duration of 30 min)

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Figure 4

The variations in the wear scar diameters of the three lower balls with load under the lubrication of the rapeseed base stock containing 1.0 wt % BBBS or 1.0 wt % BBHS and 1.0 wt % DIBPS (four-ball machine, rotary speed of 1450 rpm, duration of 30 min)

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Figure 5

The variations in the friction coefficient with load for various lubricant systems (four-ball machine, additive concentration of 1.0 wt %, speed of 1450 rpm, duration 30 of min)

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Figure 6

Typical TGA curves of DIBPS, BBBS, and BBHS

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Figure 8

[(a)–(d)] XPS spectra of (a) O1s, (b) N1s, (c) S2p, and (d) Fe2p on the worn steel surface lubricated with RSO-1.0 wt % BBBS (four-ball machine, load of 392 N, rotary speed of 1450 rpm, duration of 30 min)

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Figure 7

[(a)–(d)] SEM morphologies of the worn steel surfaces lubricated with RSO alone and RSO-1.0 wt % BBBS (four-ball machine, load of 392 N, rotary speed of 1450 rpm, duration of 30 min). (a) Lubricated with RSO, (b) enlarged image of (a), (c) lubricated with RSO-1.0 wt % BBBS, and (d) enlarged image of (c).

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