High corrosion resistant aluminium alloy

Abstract

An aluminum-based, corrosion resistant, alloy comprising: 0.06-0.35% by weight of iron, 0.05-0.15% by weight of silicon, 0.01-1.0% by weight of manganese, 0.02-0.60% by weight of magnesium, 0.05-0.70% by weight of zinc, one or more of the elements zirconium, titanium, chromium and copper up to a maximum of 1.30% by weight, up to 0.15% by weight of other impurities, each no greater than 0.03% by weight, and the balance aluminum, said aluminum-based alloy exhibit high corrosion resistance and improved formability.

1 . An aluminium-based, corrosion resistant, alloy comprising: 
 0.06-0.35% by weight of iron,    0.05-0.15% by weight of silicon,    0.01-1.0% by weight of manganese,    0.02-0.60% by weight of magnesium,    0.05-0.70% by weight of zinc,    one or more of the elements zirconium, titanium, chromium and copper up to a maximum of 1.30% by weight,    up to 0.15% by weight of other impurities, each no greater than 0.03% by weight, and the balance aluminium    
     
     
         2 . The alloy according to  claim 1 , wherein said iron content ranges between about 0.10-0.20% by weight.  
     
     
         3 . The alloy according to any one of the preceeding claims wherein said manganese content ranges between about 0.50-0.70% by weight.  
     
     
         4 . The alloy according to any one of the preceeding claims wherein said magnesium content ranges between about 0.15-0.30% by weight.  
     
     
         5 . The alloy according to any one of the preceeding claims wherein said zinc content ranges between about 0.10-0.30% by weight.  
     
     
         6 . The alloy according to any one of the preceeding claims wherein said zirconium content ranges between about 0.10-0.18% by weight.  
     
     
         7 . The alloy according to any one of the preceeding claims wherein said titanium content ranges between about 0.10-0.15% by weight.  
     
     
         8 . The alloy according to any one of the preceeding claims wherein said chromium content ranges between about 0.05-0.15% by weight.  
     
     
         9 . The alloy according to any of the preceeding claims wherein said copper content ranges below about 0.01% by weight.  
     
     
         10 . The alloy as in  claim 1  when extruded and drawn into tubing, has a wall thickness of about 0.4 mm and exhibit a resistance to perforation at least 10 times the exposure of conventional alloys in a cyclical accelerated corrosion test per ASTM G85-85 Annex A3.