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.

  • Supplemental Notes:
    • Presented at the SAE Congress and Exposition, Detroit, 27 February-3 March 1978.
  • Corporate Authors:

    Society of Automotive Engineers (SAE)

    400 Commonwealth Drive
    Warrendale, PA  United States  15096
  • Authors:
    • McNamara, P
    • Singleton, O R
  • Publication Date: 1978

Media Info

  • Features: References;
  • Pagination: 10 p.

Subject/Index Terms

Filing Info

  • 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