Process for improving the corrosion resistance of brazing sheet

Details Process for improving the corrosion resistance of brazing sheet Process for improving the corrosion resistance of brazing sheet

C - Chemistry, Metallurgy

22

F

13/20, 148/30.5

C22F 1/043 (2006.01) B23K 1/19 (2006.01) B23K 35/28 (2006.01) B32B 15/01 (2006.01)

Patent

CA 1309322

Abstract A process is described for producing a corrosion resistant aluminum composite sheet product for use in brazing. The process steps comprise: (a) casting an aluminum-base core material containing no more than 0.4% iron, no more than 0.15% silicon, from about 0.1% to about 0.6% copper and from about 0.7% to about 1.5 manganese, (b) cladding the as-cast core material with an aluminum- base brazing alloy, with hot rolling to form a sheet product, and (c) directly cold rolling the sheet product to final gauge. When this product is subjected to a brazing heat cycle, a band of dense precipitate is formed in the core alloy immediately adjacent the cladding which protects the core against corrosion.

557720

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