This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Elucidation of the Sulfide Corrosion Mechanism in Piston Pin Bushings
Technical Paper
2020-01-1079
ISSN: 0148-7191, e-ISSN: 2688-3627
This content contains downloadable datasets
Annotation ability available
Sector:
Language:
English
Abstract
Recent trends to downsize engines have resulted in lighter weight and greater compactness. At the same time, however, power density has increased due to the addition of turbocharger and other such means to supplement engine power and torque, and this has increased the thermal and mechanical load. In this kind of environment, corrosion of the copper alloy bushing (piston pin bushing) that is press-fitted in the small end of the connecting rod becomes an issue. The material used in automobile bearings, of which the bushing is a typical example, is known to undergo sulfidation corrosion through reaction with an extreme-pressure additive Zinc Dialkyldithiophosphate (ZnDTP) in the lubricating oil. However, that reaction path has not been clarified. The purpose of the present research, therefore, is to clarify the reaction path of ZnDTP and copper in an actual engine environment. In order to ascertain the effects of the heat, copper content, and state of deterioration of the oil on corrosion, component corrosion tests were conducted. The results of the component corrosion tests suggested that the main factor in the corrosion mechanism was not the direct reaction between ZnDTP and copper, but rather that intermediate products contribute greatly. The structure of the intermediate products was identified by making complementary use of X-ray diffraction (XRD), X-ray absorption near edge structure (XANES), and extended X-ray absorption fine structure (EXAFS) analysis at the Aichi Synchrotron Radiation Center. The corrosion reaction path was then clarified by making use of the structure of the products obtained in this way together with first principles calculation to comprehensively evaluate the energy generated in each reaction path.
Authors
Citation
Motani, R., Maeyama, K., Yoshii, K., Oshida, S. et al., "Elucidation of the Sulfide Corrosion Mechanism in Piston Pin Bushings," SAE Technical Paper 2020-01-1079, 2020, https://doi.org/10.4271/2020-01-1079.Data Sets - Support Documents
| Title | Description | Download |
|---|---|---|
| Unnamed Dataset 1 | ||
| Unnamed Dataset 2 | ||
| Unnamed Dataset 3 | ||
| Unnamed Dataset 4 |
Also In
References
- Iwama , Y. , Yamane , M. , Iizuka , K. , and Wadayama , K. Blackening of Bearing Material Caused by Lubricating Oil for Automotive Engine Transactions of the Society of Automotive Engineers of Japan 47 2 615 619 2016
- Jayne , D. , Shanklin , J. , and Stachew , C. Controlling the Corrosion of Copper Alloys in Engine Oil Formulations: Antiwear, Friction Modifier, Dispersant Synergy SAE Technical Paper 2002-01-2767 2002 https://doi.org/10.4271/2002-01-2767
- Spikes , H. History and Mechanisms of ZDDP Tribology Letters 17 3 469 489 2004
- Fujii , A. , Fujiwara , A. , Nagakari , M. , and Nagatomi , E. Study of ZnDTP Degradation Controlled by Low Treatrate Metallic Detergents and the Mechanism Journal of Japanese Society of Tribologists 61 9 615 626 2016
- Ravel , B. and Newville , M. ATHENA, ARTEMIS, HEPHAESTUS: Data Analysis for X-Rayabsorption Spectroscopy Using IFEFFIT Journal of Synchrotron Radiation 12 537 541 2005 10.1107/S0909049505012719
- Newville , M. J. Synchrotron Rad. 8 322 324 2001
- Materials Design, Inc. 2014
- Kresse , G. and Furthmuller , J. Phys. Rev. B54 11169 1996
- Kresse , G. and Furthmuller , J. Computat. Mat. Sci. 6 15 1996
- Kresse , G. and Joubert , D. Phys. Rev. B59 1758 1999