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Field Corrosion Performance of Magnesium Powertrain Components in Light Truck
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Abstract
Field inspection of 41 vehicles equipped with magnesium clutch housings or transfer cases was carried out after service in Nova Scotia or Prince Edward Island for periods up to five years. This area is reported to be the most severe location in North America for salt-induced corrosion of automobiles. The die cast magnesium components were unpainted, but basic measures were taken to control galvanic corrosion.
The clutch housings had the longest history, with production spanning the years 1982-1987. The general surface corrosion of these housings was negligible, notably less than that of die cast aluminum 380 or carbon steel components on the same vehicle. Slight galvanic corrosion of exposed bolt bosses was observed, induced by the plated bolt. Some galvanic action was noted at the face-to-face junction between the magnesium clutch housings and aluminum 380 transmission cases. This was not sufficiently advanced to indicate a threat to component function. No galvanic action between the magnesium clutch housing and the Aluminum 5052 spacer plate at the block end was detected.
Transfer case history was limited to the 1987 model year. The five trucks examined had only one winter's service. The magnesium cases showed no significant corrosion, either general surface or galvanic.
Some supplementary Salt Spray test results are reported.
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Citation
Hawke, D., Davis, J., and Fekete, R., "Field Corrosion Performance of Magnesium Powertrain Components in Light Truck," SAE Technical Paper 890206, 1989, https://doi.org/10.4271/890206.Also In
References
- Reichek K. N. Clark K. J. Hillis J. E. “Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy” Society of Automotive Engineers International Congress & Exposition Detroit February -March 1985
- Frey D. Albright D. L. “Development of a Magnesium Alloy Structural Truck Component” Proceedings of the 41st World Magnesium Conference London June 1984
- Davis J.B.F. “Magnesium in Drive Train Components” Society of Automotive Engineers International Congress & Exposition Detroit February - March 1985
- “Cracking Down on Corrosion” American Iron and Steel Institute Publication SG 731-1078-20M-SR
- Turcotte R. Baboian R. “Comparative Corrosivity of the Automotive Environment” Society of Automotive Engineers International Congress & Exposition Detroit Feburary 1986
- Chance R. L. “Corrosion, De-icing Salts, and the Environment” National Association of Corrosion Engineers Conference March 1974
- Hawke D. L. Hillis J. E. Unsworth W. “Preventive Practice for Controlling the Galvanic Corrosion of Magnesium Alloys” International Magnesium Association Technical Committee Report 1988