Aluminum alloy sheet for containers excellent in corrosion resistance and method of producing same
US4707195A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 12, 1984 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Oct 12, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12757
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A high corrosion resistant aluminum alloy sheet useful in the manufacture of containers for saline food and beverage, especially suited for easy opening can end manufacturing, which is made of an aluminum alloy consisting essentially of, by weight percentages PA0 Mg: from 0.50 to 2.0% PA0 Si: from 0.10 to 0.70% PA0 Mn: from 0.30 to 1.5% PA0 Cu: from 0.10 to 1.0% PA1 and the balance being essentially aluminum, the spontaneous electrode potential of the sheet being in the range of from -700 to -630 mV in a 0.1% sodium chloride solution at 25.degree. C., against an AgCl reference electrode. The aluminum alloy sheet is fabricated through a series of steps of hot rolling a cast ingot with the foregoing composition; intermediate cold rolling to an intermediate thickness which is at least one and a half times a final thickness; heating to a temperature of 500.degree. C. or higher; then rapidly cooling from the temperature; and then final cold rolling. The spontaneous electrode potential of the invention alloy sheet is the same level as that of the mild steel or tin-free steel and, thus, can be used in combination with these steel can body materials without causing any detrimental galvanic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.