Aluminum alloy tube and fin assembly for heat exchangers having improved corrosion resistance after brazing

  • US 7,781,071 B2
  • Filed: 12/22/2003
  • Issued: 08/24/2010
  • Est. Priority Date: 12/23/2002
  • Status: Active Grant
First Claim
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1. A brazed heat exchanger assembly comprising extruded heat exchanger tubes joined to heat exchanger fins;

  • wherein said heat exchanger tubes are formed of a first aluminum alloy comprising 0.4 to 1.1% percent by weight manganese, up to 0.01% by weight copper, up to 0.05% by weight zinc, up to 0.2% by weight iron, up to 0.2% by weight silicon, up to 0.01% by weight nickel, up to 0.05% by weight titanium, and a balance of aluminum and incidental impurities;

    wherein said heat exchanger fins are formed of a second aluminum alloy comprising 0.9 to 1.5% by weight manganese and at least 0.5% by weight zinc;

    wherein the heat exchanger tubes exhibit good self corrosion protection and the heat exchanger fins are galvanically sacrificial relative to the heat exchanger tubes; and

    wherein the manganese weight percent of the first aluminum alloy is related to the manganese weight percent of the second aluminum alloy by the formula
    Mntube(wt %)>

    Mnfin(wt %)−

    0.8 wt %where Mntube is the manganese weight percent of the first aluminum alloy and Mnfin is the manganese weight percent of the second aluminum alloy.

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