Method of producing hardened aluminum alloy sheets having superior corrosion resistance
US5062901A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 15, 1990 |
| Grant date | Nov 5, 1991 |
| Priority date | — |
| Expiry date | May 15, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22F1/047
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides a method of producing a hardened aluminum alloy sheet comprising the steps of casting an aluminum alloy containing 4.0 to 6.0% Mg in a conventional including, homogenizing, hot rolling, cold rolling, intermediate annealing and stabilizing treatment, the improvement which comprises: the aluminum alloy is provided as an Al-Mg-Cu alloy containing, in addition to Mg, 0.05 to 0.50% Cu; and the Al-Mg-Cu alloy is subjected to a final intermediate annealing treatment comprising a heating to temperatures of 350.degree. to 500.degree. C. and rapid cooling to temperatures of 70.degree. C. or less at a cooling rate of 1.degree. C./sec or more and a finishing cold rolling with a reduction of at least 50%, followed by the stabilizing treatment, thereby providing a hardened aluminum alloy sheet having a superior corrosion resistance together with high levels of strength and formability. In the above production method, the finishing cold rolling with a reduction of at least 50% may be followed by coating and baking operations carried out under application of tension to the alloy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.