Corrosion resistant aluminum alloy

• US 20030165397A1
• Filed: 04/24/2003
• Published: 09/04/2003
• Est. Priority Date: 05/22/2000
• Status: Abandoned Application

• Current Assignee: Norsk Hydro Asa (Norsk Hydro)
• Original Assignee: Norsk Hydro Asa (Norsk Hydro)
• Inventors: Auran, Lars, Furu, Trond, Daaland, Ole
• Application Number:
  US10/296,335
• Publication Number:
  US 20030165397A1
• Time in Patent Office: Days
• US Class Current: 420/540
• CPC Class Codes: C22C 21/00 Alloys based on aluminium
• CPC Class Codes: C22C 21/02 with silicon as the next major constituent
• CPC Class Codes: C22C 21/10 with zinc as the next major constituent
• CPC Class Codes: F28F 21/084 from aluminium or aluminium alloys

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.

Claims

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.