Aluminum alloys having high corrosion resistance after brazing

Details Aluminum alloys having high corrosion resistance after brazing Aluminum alloys having high corrosion resistance after brazing

2005-09-06

2005-09-06

Wyszomierski, George (Department: 1742)

Metal treatment

Stock

Aluminum base

C420S548000, C420S553000

Reexamination Certificate

active

06939417

ABSTRACT:
When using AA3000 series and AA1000 series aluminum alloys to produce extruded products for heat exchanger applications, by controlling the level of copper and nickel in the alloy to very low levels it is possible to produce excellent corrosion resistance both before and after a brazing cycle. To achieve these results, the copper content should be no more than 0.006% by weight and the nickel no more than 0.005% by weight. A typical alloy of the invention contains about 0.001-0.5% by weight manganese, 0.001-0.7% by weight iron, 0.001-0.02% by weight titanium, 0.001-0.3% by weight silicon, less than 0.006% by weight copper, less than 0.005% by weight nickel and 0.001-0.02% by weight zinc, with the balance consisting of aluminum and incidental impurities. No zinc addition to the alloy is required either by zinc spraying or by alloy addition.

REFERENCES:
patent: 5286316 (1994-02-01), Wade
patent: 2247037 (1998-09-01), None
patent: 0 899 350 (1999-03-01), None
patent: WO 97/46726 (1997-12-01), None
patent: WO 99/04051 (1999-01-01), None

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