ZINC DISTRIBUTION IN VACUUM BRAZED ALCLAD BRAZING SHEET
The effect of typical vacuum brazing cycles on the distribution of zinc in 7072 clad vacuum brazing sheet is described. The cladding contains a 1.0% concentration of zinc, which can be lost by both sublimation into the environment and diffusion into the core. Where both types of losses occur, there is a subsurface region anodic to the surface. For heavier gauges, there is sufficient retained zinc in the postbraze composite. For lighter gauges, nominal composition 7072 does not provide adequate retained zinc. If the initial zinc concentration is increased to 3.0%, there is sufficient retained zinc so that the cladding is significantly more anodic than the core.
- Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
Warrendale, PA United States 15096
- McNamara, P
- Singleton, O R
- Publication Date: 1978
- Features: References;
- Pagination: 10 p.
- TRT Terms: Aluminum; Brazing; Clad metals; Vehicle components; Zinc
- Subject Areas: Safety and Human Factors; Vehicles and Equipment;
- Accession Number: 00395642
- Record Type: Publication
- Source Agency: National Highway Traffic Safety Administration
- Report/Paper Numbers: SAE 780301, HS-025 411U
- Files: HSL, USDOT
- Created Date: Jun 30 1985 12:00AM