This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Development of an Understanding of the Critical Factors Influencing Waterside Corrosion Behaviour of Brazed Aluminium Radiators
Annotation ability available
Sector:
Language:
English
Abstract
The application of aluminium alloy materials for automotive heat exchangers, including engine cooling and air conditioning systems, is now widespread. To meet the industry demands of both extended service life and improved reliability for heat exchanger components, it is important that the critical factors influencing corrosion behaviour are properly understood, particularly with the trend towards downgauging of materials.
To maximise resistance to waterside corrosion, manufacturers have adopted the approach of using an internal cladding, commonly a high purity or zinc - containing alloy, to provide sacrificial protection of the core material.
Recent studies have shown that the presence of an internal cladding can, under certain conditions, promote rapid localised attack of the core alloy.
This paper will discuss the implication of these results to in-service performance of radiator units and describe the development of a rapid screening test for evaluating the performance of different core/cladding systems.
Recommended Content
Citation
Gray, A. and Howells, A., "Development of an Understanding of the Critical Factors Influencing Waterside Corrosion Behaviour of Brazed Aluminium Radiators," SAE Technical Paper 940499, 1994, https://doi.org/10.4271/940499.Also In
References
- Zamin, M. “The role of Mn in the corrosion behaviour of Al-Mn alloys” Corrosion 37 627 632 Nov. 1981
- Cooke, W.E. Wright, T.E. Hirschfield, J.A. “Furnace brazing of aluminium with a non-corrosive flux” SAE 780300 March 1978
- Fortin, P.E. Marois, P.H. Evans, D.G.S. Aug. 1991
- Finegan, W.D. May 1986
- Woods, R.A. Scott, A.C. Harris, J.F. “A corrosion resistant alloy for vacuum brazed aluminium heat exchangers” SAE 910591 1991
- Marshall, G.J. Bolingbroke, R.K. Gray, A. Metallurgical Transactions 1993 24A 1935 1942
- Scholin, K. Mannershog, B. “Corrosion resistant aluminium radiator materials for vacuum and controlled atmosphere brazing” SAE 931077 1993
- Dorward, R.C. “Laboratory corrosion tests on aluminium radiator materials” SAE 780302 1978
- Wiggle, R.R. Hospadoruk, V. “A rapid method of predict the effectiveness of inhibited engine coolants in aluminium heat exchangers” SAE 800800 1980
- Garcia, J. Shearer, R. “Internal corrosion testing of aluminium heat exchangers” SAE 931107 1993
- Ando, Y. Nita, I. Uramato, M. Ochiai, H. Fujiyoshi, T. “Development of aluminium radiators using the Nocolok brazing process - corrosion resistance of new aluminium radiators by applying a Nocolok brazing process” SAE 870180 1987
- Brown, B.F. Fujii, E.P. Dahlberg, J. J. Electrochem. Society 47 1121 1951
- Gray, A. Newton, C.J. Alexander, M. “Microstructural effects on the localised corrosion behaviour of 8090 sheet” Proceedings of 6th International Conference on Al-Li Alloys, Garmisch- Partenkirchen 7-11 October 1991 Peters, M. Winkler, P.J. 2 1992 691 696