Corrosion-resistant aluminum alloy

Abstract

An extrudable, drawable and brazeable aluminum alloy that has improved corrosion resistance and is suitable for use in thin-wall fluid-carrying tube lines. Preferred alloys consist essentially of, by weight, about 0.17 to about 0.22% iron, about 0.06 to about 0.10% silicon, about 0.30 to about 0.70% manganese, about 0.10 to about 0.30% magnesium, and about 0.19 to about 0.25% zinc, with the balance aluminum and incidental impurities.

1 . An aluminum alloy consisting essentially of, by weight, about 0.17 to about 0.22% iron, about 0.06 to about 0.10% silicon, about 0.30 to about 0.70% manganese, about 0.10 to about 0.30% magnesium, and about 0.19 to about 0.25% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         2 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.18 to 0.22 weight percent iron.  
     
     
         3 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.30 to 0.40 weight percent manganese.  
     
     
         4 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.40 to 0.52 weight percent manganese.  
     
     
         5 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.62 to 0.70 weight percent manganese.  
     
     
         6 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.10 to 0.15 weight percent magnesium.  
     
     
         7 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.15 to 0.20 weight percent magnesium.  
     
     
         8 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.25 to 0.30 weight percent magnesium.  
     
     
         9 . An aluminum alloy according to  claim 1 , wherein the alloy contains 0.20 to 0.25 weight percent zinc.  
     
     
         10 . An aluminum alloy according to  claim 1 , wherein the alloy consists of, by weight, 0.17 to 0.22% iron, 0.06 to 0.10% silicon, 0.30 to 0.40% manganese, 0.10 to 0.15% magnesium, and 0.19 to 0.25% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         11 . An aluminum alloy according to  claim 1 , wherein the alloy consists of, by weight, 0.17 to 0.22% iron, 0.06 to 0.10% silicon, 0.40 to 0.52% manganese, 0.15 to 0.20% magnesium, and 0.19 to 0.25% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         12 . An aluminum alloy according to  claim 1 , wherein the alloy consists of, by weight, 0.18 to 0.22% iron, 0.06 to 0.10% silicon, 0.62 to 0.70% manganese, 0.25 to 0.30% magnesium, and 0.20 to 0.25% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         13 . A fluid-carrying tube of an automotive air-conditioning system, the tube being drawn from an aluminum alloy consisting of, by weight, about 0.17 to about 0.22% iron, about 0.06 to about 0.10% silicon, about 0.30 to about 0.70% manganese, about 0.10 to about 0.30% magnesium, and about 0.19 to about 0.25% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         14 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.30 to 0.40 weight percent manganese.  
     
     
         15 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.40 to 0.52 weight percent manganese.  
     
     
         16 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.62 to 0.70 weight percent manganese.  
     
     
         17 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.10 to 0.15 weight percent magnesium.  
     
     
         18 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.15 to 0.20 weight percent magnesium.  
     
     
         19 . A fluid-carrying tube according to  claim 13 , wherein the alloy contains 0.25 to 0.30 weight percent magnesium.  
     
     
         20 . A fluid-carrying tube according to  claim 13 , wherein the alloy consists of, by weight, about 0.20% iron, about 0.08% silicon, about 0.34% manganese, about 0.11% magnesium, and about 0.19% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         21 . A fluid-carrying tube according to  claim 13 , wherein the alloy consists of, by weight, about 0.20% iron, about 0.08% silicon, about 0.45% manganese, about 0.17% magnesium, and about 0.19% zinc, with the balance essentially aluminum and incidental impurities.  
     
     
         22 . A fluid-carrying tube according to  claim 13 , wherein the alloy consists of, by weight, about 0.21% iron, about 0.08% silicon, about 0.68% manganese, about 0.28% magnesium, and about 0.25% zinc, with the balance essentially aluminum and incidental impurities.