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Effects of Chemical Surface Treatments on the Performance of an Automotive Paint System on Die Cast Magnesium
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English
Abstract
High purity die cast magnesium clutch housings and 4WD transfer cases have demonstrated their ability to function in corrosive road salt environments without the use of protective coatings. The weight reduction opportunities offered by magnesium also extend to highly visible components such as wheels, retractable headlight covers, and exterior mirror housings, where a decorative and durable finish is required. This paper examines the effects of chemical surface preparation on the performance of a typical automotive paint system on die cast AZ91D, in salt and fresh water laboratory exposures. The effects of prior mechanical damage to the coating by Gravelometer testing and other means are examined. Mild etching chrome pickles provided superior paint preparation for nominally clean as-cast surfaces. Commercial iron phosphates were effective when applied over previously pickled surfaces.
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Hawke, D. and Gaw, K., "Effects of Chemical Surface Treatments on the Performance of an Automotive Paint System on Die Cast Magnesium," SAE Technical Paper 920074, 1992, https://doi.org/10.4271/920074.Also In
References
- Reichek K. N. Clark K. J. Hillis J.E. “ Controlling the Salt Water Corrosion Performance of Magnesium AZ91 Alloy ” SAE Technical Paper 850417 February 1985
- Hawke D. L. Davis J. B. Fekete R. “ Field Corrosion Performance of Magnesium Powertrain Components in Light Truck ” SAE Technical Paper 890206 February 1985
- Hillis J. E. Murray R. W. “ Finishing Alternatives for High Purity Magnesium Alloys ” SDCE Paper GT87-003 May 1987
- Operations in Magnesium Finishing Dow Chemical Manual 1982
- Chromating of Magnesium Castings Data Manual, Hydro Magnesium
- Protection and Surface Treatment Bulletin Magnesium Elektron Ltd.
- Freeman D. B. “ Phosphating and Metal Pre-treatment ” Industrial Press Inc. New York, NY 1986