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A Study of Erosion-Corrosion in Aluminum Radiator Alloys
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English
Abstract
The frequent occurrence of erosion-corrosion attack in service failures of aluminum radiators suggests the need for a rapid test which will predict erosion-corrosion susceptibility in aluminum alloys under conditions simulating those in an actual radiator. This paper describes a multijet test apparatus which has been used to compare the erosion-corrosion resistance of aluminum alloys in antifreeze solutions at 200 F. Impingement velocities of up to 130 ft/s have been used.
The effect of short-term jet impingement has been found to produce a mode of erosion-corrosion attack similar to that found in a 6951 alloy radiator after 40,000 miles of service. Attack appears to progress through several distinct stages starting with the development of a high density of pits which eventually become coalesced together at points of very high impingement velocity. The rate of attack has been found to be dependent on alloy composition and properties, jet velocity, and metal surface condition.
The test would indicate that the susceptibility of aluminum radiator alloys to erosion-corrosion failure can be predicted by the effects of high-speed antifreeze jets produced with the equipment described.
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Authors
Citation
Anthony, W. and Popplewell, J., "A Study of Erosion-Corrosion in Aluminum Radiator Alloys," SAE Technical Paper 720009, 1972, https://doi.org/10.4271/720009.Also In
References
- Herr H. K. “Fluxless Vacuum Brazing of Aluminum.” Metals Progress 96 December 1969 68 70
- Terrill J. R. “Brazing Aluminum in a Dry Air Atmosphere.” Metals Progress 96 December 1969 70 73
- May R. “The Jet Impingement Apparatus for 1254, The Assessment of Corrosion by Moving Sea Water.” Journal of Institute of Metals 77 1950 331 344
- Thiruvengadam A. Rudy S. L. “Experimental and Analytical Investigations on Multiple Liquid Impact Erosion.” National Aeronautical and Space Administration, NASA Contractor Report NASA CR-1288 March 1969