The use of magnesium diecastings for many automotive applications is mainly hindered by the lack of cost effective functional coating systems. For car body applications, e.g. no satisfying coating systern is currently available matching Class A surface requirements for exterior car body components. In the first part of this paper a novel multilayer coating systern is introduced containing one layer based on silicone-modified organic resins which provides excellent corrosion resistance and an improved leveling behavior. Thus the coverage of different surface defects originating from diecasting is possible without or with only minimum posttreatment like sanding and grinding. Results showing the performance of the novel coating systerns in salt spray testing and VDA cyclic testing are presented. The second part of the paper focuses on the application of thermally sprayed ceramic and metallurgical coatings on magnesium substrates to provide wear resistant surfaces for tribological application. The surfaces are coated with a secondary polymer layer or thin film in order to obtain in addition a low friction coefficient under dry lubrication conditions. Experimental results of the tribological performance of these combined coating systerns on different magnesium alloys are presented.
Functional coating systems on magnesium diecastings for corrosion protection and tribological applications
Funktionelle Beschichtungssysteme auf Magnesium-Formgußteile für Korrosionsschutz und tribologische Anwendungen
2001
6 Seiten, 11 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
SAE Technical Papers | 2001
|British Library Conference Proceedings | 2001
|Designing Magnesium Diecastings
SAE Technical Papers | 1980
|Designing magnesium diecastings
Kraftfahrwesen | 1980
|