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Research Papers: Lubricants

Corrosion Resistance and Tribological Characteristics of Polyaniline as Lubricating Additive in Grease

[+] Author and Article Information
Zhengfeng Cao

School of Energy Power and
Mechanical Engineering,
North China Electric Power University,
Beijing 102206, China
e-mail: czf90@ncepu.edu.cn

Yanqiu Xia

School of Energy Power and
Mechanical Engineering,
North China Electric Power University,
Beijing 102206, China;
State Key Laboratory of Solid Lubrication,
Lanzhou Institute of Chemical Physics,
Chinese Academy of Sciences,
Lanzhou 730000, China
e-mail: xiayq@ncepu.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 23, 2016; final manuscript received February 18, 2017; published online June 30, 2017. Assoc. Editor: Ning Ren.

J. Tribol 139(6), 061801 (Jun 30, 2017) (7 pages) Paper No: TRIB-16-1293; doi: 10.1115/1.4036271 History: Received September 23, 2016; Revised February 18, 2017

Polyaniline (PANI) was doped as lubricating additive to afford grease. The effect of PANI on the physicochemical characteristics, corrosion resistance, and tribological performances of lubricating grease was investigated in details, and the tribological action mechanisms of lubricating grease were analyzed in relation to worn surface analyses by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscope (EDS). Results indicate that the PANI-doped grease has superior conductive and thermal properties. And PANI-doped grease has an excellent corrosion resistance, which is attributed to the isolation effect and the compact passivated film generated by reaction of PANI and metal. In the meantime, the PANI-doped grease performs superior friction reduction and wear resistance under different applied loads and frequencies. It is mainly ascribed that the PANI can perform like spacers to avoid direct contact between the contact interfaces, and the protective tribofilm is generated by physical adsorption and chemical reaction.

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References

Figures

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Fig. 1

Structural formula of T705 and T706

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Fig. 2

SEM morphology and Fourier transform infrared analysis spectra of PANI

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Fig. 3

TGA curves of the lubricating greases

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Fig. 4

Aluminum and steel blocks after salt spray test. (a) and (a′) PANI grease, (b) and (b′) T705 grease, (c) and (c′) T706 grease, (d) and (d′) graphite grease, and (e) and (e′) base grease (upper blocks are aluminum and lower blocks are steel).

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Fig. 5

Evolution of average COFs (a) and average wear widths (b) for the prepared greases at different additives concentration at RT

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Fig. 6

Evolution of average COFs (a) and average wear widths (b) for the prepared greases at different loads, 5 Hz, and RT

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Fig. 7

Evolution of average COFs (a) and average wear widths (b) for the prepared greases at different frequencies, 40 N, and RT

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Fig. 8

MFT-R4000 tribometer and evolution of friction coefficient with time during a current ramp test from 0 to 20 A for PANI grease at room temperature (load: 20 N, stroke: 5 mm, frequency: 5 Hz, and current: 0–20 A)

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Fig. 9

Morphologies of the worn surfaces lubricated with lubricating greases at 40 N and 5 Hz. (a) and (a′) PANI grease, (b) and (b′) T705 grease, and (c) and (c′) T706 grease.

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Fig. 10

EDS of the worn surfaces lubricated with base and PANI greases at 40 N and 5 Hz. Base grease: (a) steel ball and (b) aluminum block; and PANI grease: (c) steel ball and (d) aluminum block.

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Fig. 11

Schematic of friction mechanism of PANI greases

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