Vacuum brazing technology is currently capable of producing aluminum automotive heat exchangers such as radiators and heater cores. The possible use of 7072 claddings on the surfaces exposed to the coolant to provide additional corrosion protection is of considerable interest. This paper describes the effect of typical vacuum brazing cycles on the distribution of zinc in 7072 clad vacuum brazing sheet.For heavier gauges (.05″), there is sufficient retained zinc in the post-braze composite. For lighter gauges (.02″ or less), nominal composition 7072 does not provide adequate retained zinc; however, if the initial zinc concentration is increased to 3% there is sufficient retained zinc so that the cladding is significantly more anodic than the core.
Zinc Distribution in Vacuum Brazed Alclad Brazing Sheet
Sae Technical Papers
1978 Automotive Engineering Congress and Exposition ; 1978
1978-02-01
Conference paper
English
Coolants , Vacuum , Radiators , Heat exchangers , Joining
Zinc distribution in vacuum brazed alclad brazing sheet
Tema Archive | 1978
|Prevention of Zinc Sublimation from Alclad Vacuum Brazing Sheet by Calcium Addition to 7072 Cladding
SAE Technical Papers | 1980
|Prevention of Zink Sublimation from Alclad Vacuum Brazing Sheet by Calcium Addition to 7072 Cladding
Automotive engineering | 1980
|Aluminum Alloy, Alclad Sheet 4.4Cu - 1.5Mg - 0.60Mn (Alclad 2024-O) Annealed, Fine Grain
SAE Technical Papers | 2019
ALUMINUM ALLOY SHEET AND PLATE ALCLAD 1Mg - 0.6Si - 0.25Cu - 0.25Cr (Alclad 6061-T4)
SAE Technical Papers | 1964