Flynn, Thiel, Boutell & Tanis
Aluminum alloy sheet for containers excellent in corrosion resistance and method of producing same
 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 corrosion. 
Sumitomo Light Metal Industries, Ltd.
C C Y
C22C C22C Y10T
inventional inventional additional
Hideo Shin
Ito Tsuchida