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Evaluation of Organic molybdenum Complex as a Synergist for Arylamine Antioxidant in Synthetic Lubricants
Technical Paper
2005-01-3824
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
An oil-soluble additive molybdenum complex (MoCP) compound was synthesized. The antioxidation properties of a formulation including polyalphaolefin synthetic lubricant (PAO), the complex of p, p'-dioctyldiphenylamine (DODPA) and MoCP, were evaluated by a differential scanning calorimetry (DSC) test and oxidation-corrosion tests. The former measures the incipient oxidation temperature (IOT) and oxidation induction time (OIT) of the lubricant at high temperature. The latter measures the oxidation stability of the oil including viscosity and total acid number increase. In the first test, the IOT and OIT of the PAO containing DODPA were improved respectively after combining with MoCP compound. In the oxidation-corrosion test, in comparison to the base fluid, the additive hardly exhibited antioxidation properties, but the combination of MoCP with DODPA showed a reduction in viscosity Increase of about 32.4%. The Total acid number increase was 25.4% less than those of the lubricants containing DODPA. These results indicate that the additive shows good oxidative synergisms with DODPA antioxidant. In addition, the changes occurring to DODPA in the oxidation of the PAO with and without MoCP were followed by gas chromatography mass spectrometer (GC/MS) measurements. The proposed mechanism of the inhibition involves a synergy between MoCP and DODPA.
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Jianqiang, H., Zhuliang, P., Feng, J., and Jianqiang, H., "Evaluation of Organic molybdenum Complex as a Synergist for Arylamine Antioxidant in Synthetic Lubricants," SAE Technical Paper 2005-01-3824, 2005, https://doi.org/10.4271/2005-01-3824.Also In
References
- Ohgake, R. Sunami, M. Yoshida. T Watanabe, H. 1989 “ASTM special Technical Publication No. 1021,” 32 33
- Bakunin V N Parenago O P. 1992 “A Mechanism of Thermooxidative Degradation of Polyol Ester Lubricants,” Joun: Syn. Lubr. 4 2 127 143
- Colclough, T. 1993 “Atmospheric oxidation and antioxidants,” II Lubrication Oil Oxidation and Stabilizaion Scott G. Elsevier Science Publishers
- Gatto, V. 1. Devlin, M. T. 1997 “Lubricant Containing Molybdenum Compound and Secondary Diarylamine,”
- Arai, K. Tomizawa, H. 1997 “Lubricating Oil Composition,”
- Shaub, H. 2001 “Mixed Antioxidant Composition,”
- Devries, L. King, 1. 1983 “Antioxidant Combinations of Molybdenum Complexes and Aromatic Amine Compounds,”
- Rounds, F. 1990 “Effects of Organic Molybdenum Compounds on the Friction and Wear Observed with ZDP-Containing Lubricant Blends,” Trib. Trans. 33 3 345 354
- Beca, S Toncka A Georges J M et al. 2004 “Synergistic effects of MoDTC and ZDTP on frictional behaviour of tribofilms at the nanometer scale” Trib. Lett. 17 4 797 809
- Muraki, M Wada, H. 2002 “Influence of the alkyl group of zinc dialkyldithiophosphate on the frictional characteristics of molybdenum dialkyldithiocarbamate under sliding conditions” Trib. Inter. 35 857 863
- Hartley, R J Maddoups, M. 2002 “Lubricant Oil Composition,”
- Barnes A M Bartle K D Thibon V R A. 2001 “A review of zinc dialkyldithiophosphates (ZDDPS): characterization of and role in lubricating oil.,” Tribology International 34 389 95
- Yamaguchi E Onopchenko A Franciso MM Chany 1999 “The relative oxidation inhibition performance of some netutral and basic zinc dithiophosphate salts,” Trib. Trans. 42 4 895 901
- Hakan K. 2001 “The impact of crankcase oil containing phosphorus on catalytic converters and engine exhaust emission,” Industrial Lubrication and Tribology 53 6 237 255
- Mazzamaro, C. A. Hutchings, M. Vargo, M. W. Evans, S. Cassidy, D. 1994 “Proper Antioxidant Selection for API SH by Statistical Evaluation in a New Sequence IIIE Screening Test,” SAE Technical Paper No. 940793 SAE Warrendale, PA
- Piecourt C G Grossiord C Mogne T L et al. 2000 “Tribochemical interactions between molybdenum dithiophosphate and succinimide additives,” Surface and Interface Analysis 30 646 650
- Masashi U Masanori K Aritoshi F et al. 1987 “Molybdenum-containing Lubricant Composition,”
- Gallo R Hoornaert P Roman J P. 1992 “Overbased Additives for Lubricant Oils Containing a Molybdenum Complex, Process for Preparing them and Compositions Containing the Said Additives,”