Claims
- 1. A method of preparing an aluminum base alloy which is resistant to corrosion comprising the steps of:
- a. casting an alloy consisting essentially of 0.2 to 1.0% by weight zinc, up to 5.0% by weight magnesium, less than 0.1% by weight iron, balance aluminum;
- b. homogenizing said cast alloy for 4 to 30 hours at 1050.degree.-1125.degree. F;
- c. rapidly cooling said homogenized alloy;
- d. hot working the quenched alloy at 850.degree. to 1000.degree. F with a reduction of approximately 20% during each pass through the hot working station;
- e. cold working the alloy with a reduction of approximately 20% during each pass through the cold working station;
- f. heating the cold worked alloy for 5 to 30 minutes at 750.degree. to 1050.degree. F;
- g. cold working said alloy down to the final desired working thickness; and
- h. heating said cold worked alloy for 1 to 25 minutes at 100.degree. to 800.degree. F.
- 2. A method according to claim 1 wherein said hot working is performed in step (d) in at least two passes.
- 3. A method according to claim 1 wherein said cold working is performed in steps (e) and (g) in at least two passes.
- 4. A method according to claim 1 wherein said cooling is with water.
- 5. A method according to claim 1 wherein the hot working of step (d) is performed to reduce the thickness of said alloy down to approximately 0.2 inch.
- 6. A method according to claim 1 wherein the cold working of step (e) is performed to reduce the thickness of said alloy down to approximately 0.2 inch.
- 7. A method according to claim 1 wherein the cold working of step (g) is performed to reduce the thickness of said alloy down to approximately 0.02 inch.
- 8. A method according to claim 1 wherein said alloy additionally contains from 0.001 to 0.1% by weight silicon.
- 9. A method according to claim 1 wherein said alloy contains from 0.5 to 2.0% by weight magnesium.
- 10. A method according to claim 1 wherein said alloy contains from 0.4 to 0.8% by weight zinc.
- 11. A method according to claim 1 wherein said alloy contains from 0.001 to 0.1% by weight iron.
Parent Case Info
This is a division of application Ser. No. 707,185, filed July 21, 1976.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3661657 |
Wong |
May 1972 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
707185 |
Jul 1976 |
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