Tribological Behaviour of Protic Ionic Liquid Composed of 2-Ethylhexylethylenediaminium Cation and Trifluoromethanesulfonate Anion as Liquid Paraffin Additive†

doi:10.7503/cjcu20180819

Abstract

Abstract:

Tribological behavior of HEtHex(TFS) as additive in liquid paraffin(LP, simulant of lubricating base oils) with different mass fractions for the contact of steel/steel ball was investigated. At the same time, the effects of the temperature and load on the anti-friction and anti-wear properties were studied. The morpho-logies and the elemental compositions of the worn surfaces were analyzed using scanning electron microscope(SEM) and X-ray energy spectroscopy(EDS). The results showed that the value of extreme-pressure increased significantly, and the antifriction and anti-wear properties of the LP improved with the addition of HEtHex-(TFS). The optimum value of HEtHex(TFS) as additive in the LP was 0.75%(mass fraction). The best abilities for the anti-friction and anti-wear property of 0.75% HEtHex(TFS) in the LP were found at 25 ℃, 294 and 196 N, respectively. The results of the elemental analysis showed that a protective boundary film was formed on the steel ball surface and it caused that the anti-friction and anti-wear properties was improved.

Key words: Protic ionic liquid, Lubricant additive, Liquid paraffin, Tribological property, Surface analysis

CLC Number:

O621
O611

TrendMD:

LI Chenguang, HUA Er, LIU Tianxia. Tribological Behaviour of Protic Ionic Liquid Composed of 2-Ethylhexylethylenediaminium Cation and Trifluoromethanesulfonate Anion as Liquid Paraffin Additive^†[J]. Chem. J. Chinese Universities, 2019, 40(7): 1411.

Figures/Tables 14

Fig.1 Structure of HEtHex(TFS)

Fig.2 Stability of oil samples with different mass fractions of HEtHex(TFS) at 25 ℃(A) Ultrasound dispersion just ended; (B) ultrasound dispersion ended after 48 h.

Fig.3 Corrosive photos of oil samples with different mass fractions of HEtHex(TFS) at 25 ℃

Fig.4 Friction coefficient diagram of six kinds of oil samples at 25 ℃

Fig.5 Wear scar diameters of six kinds of oil samples at 25 ℃

Fig.6 Extreme pressure(F) of LP with different mass fractions of HEtHex(TFS) at 25 ℃

Fig.7 Effects of temperature on the friction coefficients of pure LP and LP with 0.75% HEtHex(TFS) under a load of 196 N

Fig.8 Effects of load on the friction coefficients of pure LP and LP with 0.75% HEtHex(TFS) under 25 ℃

Fig.9 Effects of temperature on the scar diameter of pure LP() and LP with 0.75% HEtHex-(TFS)( ) under a load of 196 N

Fig.10 Effects of load on the scar diameter of pure LP( ) and LP with 0.75% HEtHex-(TFS)() under 25 ℃

Fig.11 SEM images of the wear surface of the down ball in LP with different mass fractions of HEtHex(TFS) under 196 N(A) 0, 25 ℃; (B) 0.75%, 25 ℃; (C) 1.25%, 25 ℃; (D) 0, 75 ℃; (E) 0.75%, 75 ℃.

Table 1 EDS analysis of surface elements of wear scar on the down balls for HEtHex(TFS)/LP

No.	w[HEtHex(TFS)] (%)	t/℃	Mass fraction(%)
No.	w[HEtHex(TFS)] (%)	t/℃	C	N	O	F	S	Cr	Fe
1	0	25	4.03	—	—	—	0.38	1.55	94.03
2	0.75	25	4.14	—	—	—	0.60	1.51	93.75
3	1.25	25	3.13	—	0.15	—	0.53	1.45	94.74
4	0	75	3.75	—	—	—	0.42	1.18	94.64
5	0.75	75	2.45	—	—	—	1.10	1.43	95.02

Fig.12 XPS analysis for pure LP(a), LP with 0.75%(b) and 1.25%(c) HEtHex(TFS) at 25 ℃ (A) C1s; (B) O1s; (C) N1s; (D) Fe2p; (E) S2p.

Table 2 XPS analysis of surface elements of wear scar on the top balls of samples 1—3 in Table 1

No.	w[HEtHex(TFS)] (%)	Temperature/℃	Mass fraction(%)
No.	w[HEtHex(TFS)] (%)	Temperature/℃	Fe	C	N	O	F	S
1	0	25	72.72	2.72	19.9	1.14	1.69	1.82
2	0.75	25	70.13	2.74	21.38	1.53	1.75	2.47
3	1.25	25	73.74	2.70	19.61	—	1.65	2.3

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