Method for improving corrosion resistance of plate-type vacuum b

Details Method for improving corrosion resistance of plate-type vacuum b Method for improving corrosion resistance of plate-type vacuum b

1993-04-27

1995-01-03

Ramsey, Kenneth J.

Metal fusion bonding

Process

Plural joints

228222, 2282332, 22826251, B23K 119

Patent

active

053779010

ABSTRACT:
A method is provided for enhancing the corrosion resistance of a 3000 series aluminum alloy. In particular, the method encompasses processing steps which promote corrosion resistance of brazed assemblies, such as tubeplate-and-center type evaporator units for automobile air conditioning systems. The method is directed at virtually eliminating the precipitation of CuAl.sub.2 particles in the grain boundaries of a 3000 series aluminum alloy, such that evaporator units formed from such an alloy are characterized by enhanced and more consistent corrosion resistance, as well as improved mechanical properties. The primary processing step involves rapidly cooling the evaporator unit after brazing so as to maintain the copper present in the 3000 series aluminum alloy in solid solution. In addition, the reheat and annealing steps are preferably controlled so as to avoid the formation of CuAl.sub.2 particles prior to brazing.

REFERENCES:
patent: 4035201 (1977-07-01), Anderson et al.
patent: 4172548 (1979-10-01), Nakamura
patent: 5037707 (1991-08-01), Fortin et al.
patent: 5125452 (1992-06-01), Yamauchi et al.
patent: 5176205 (1993-01-01), Anthony
Kirk-Othmer, "Encyclopedia of Chemical Technology," Third Edition, vol. 2, (1978), pp. 181-183.

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