Corrosion resistant aluminum alloy

Abstract

An aluminium-based alloy consisting of 0.05-1.00% by weight of iron, 0.05-0.60% by weight of silicon, less than 0.50% by weight of copper, up to 1.20% by weight of manganese, 0.02 to 0.20% by weight of zirconium, up to 0.50% by weight of chromium, 0.02 to 1.00% by weight of zinc, 0.02 to 0.20% by weight of titanium, 0.02 to 0.20% by weight of vanadium, up to 2.00% by weight of magnesium, up to 0.10% by weight of antimony, up to 0.02% by weight of incidental impurities and the balance aluminium, the total amount of Ti plus Cr plus V being less than 0.3% by weight and the amount of V being lower than the amount of Cr, said aluminium-based alloy exhibiting high corrosion resistance and high extradability.

1 . An aluminium-based alloy consisting of 
 0.05-1.00% by weight of iron,    0.05-0.60% by weight of silicon,    less than 0.50% by weight of copper,    up to 1.20% by weight of manganese,    0.02 to 0.20% by weight of zirconium,    up to 0.50% by weight of chromium,    0.02 to 1.00% by weight of zinc,    0.02 to 0.20% by weight of titanium,    0.02 to 0.20% by weight of vanadium,    up to 2.00% by weight of magnesium,    up to 0.10% by weight of antimony,    up to 0.02% by weight of incidental impurities    and the balance aluminium, the total amount of Ti plus Cr plus V being less than 0.3% by weight and the amount of V being lower than the amount of Cr, said aluminium-based alloy exhibiting high corrosion resistance and high extrudability.    
     
     
         2 . The alloy of  claim 1 , wherein said iron content ranges between 0.05-0.55% by weight.  
     
     
         3 . The alloy of  claim 2 , wherein said iron content ranges between 0.05-0.25% by weight  
     
     
         4 . The alloy of any one of the preceding claims, wherein said silicon content ranges between 0.05-0.20% by weight.  
     
     
         5 . The alloy of any one of the preceding claims, wherein said silicon content ranges between 0.05-0.15% by weight.  
     
     
         6 . The alloy of any one of the preceding claims wherein said copper content ranges below 0.05% by weight.  
     
     
         7 . The alloy of any one of the preceding claims wherein said zirconium content ranges between 0.02 and 0.18% by weight.  
     
     
         8 . The alloy of any one of the preceding claims wherein said zinc content ranges between 0.02 and 0.50% by weight.  
     
     
         9 . The alloy of  claim 8  wherein said zinc content ranges between 0.10 and 0.50% by weight.  
     
     
         10 . The alloy of  claim 9  wherein said zinc content ranges between 0.10 and 0.25% by weight.  
     
     
         11 . The alloy of any one of the preceding claims wherein said titanium content ranges between 0.02 and 0.15% by weight.  
     
     
         12 . The alloy of any one of the preceding claims wherein said vanadium content ranges between 0.02 and 0.12% by weight.  
     
     
         13 . The alloy of any one of the preceding claims wherein said manganese content ranges between 0.05 and 0.30% by weight.  
     
     
         14 . The alloy of  claim 13  wherein said chromium content ranges between 0.02 and 0.25% by weight.  
     
     
         15 . The alloy of any one of the claims  13  or  14  wherein said magnesium content ranges between 0.00 and 0.03% by weight.  
     
     
         16 . The alloy of any one of the  claims 1  to  12  wherein said manganese content ranges between 0.50 and 0.80% by weight.  
     
     
         17 . The alloy of  claim 16  wherein said chromium content ranges between 0.02 and 0.18% by weight.  
     
     
         18 . The alloy of any one of the claims  16  or  17  wherein said magnesium content ranges between 0.00 and 0.30% by weight.  
     
     
         19 . The alloy of any one of the  claims 1  to  12  wherein said zirconium content ranges from 0.10 to 0.18% by weight.  
     
     
         20 . The alloy of  claim 18  which after casting has been heated with a rate of less than 150° C./hour heating rate to a temperature of between 450 and 550° C., and kept at said temperature from 2 to 10 hours.  
     
     
         21 . The alloy of  claim 19  that after cold forming has been annealed with controlled and slow heating rate to temperatures of between 150 and 350 degrees C. and kept at temperature for between 10 and 10000 min.