C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
75/83, 148/55.6
C21D 1/44 (2006.01) C22C 21/10 (2006.01) C22F 1/053 (2006.01)
Patent
CA 1047901
Abstract of the Disclosure A method of thermally treating an article composed of an alloy consisting essentially of aluminum, 4 to 8% zinc, 1.5 to 3.5% magnesium, 1 to 2.5% copper, and at least one element selected from the group consisting of 0.05 to 0.3% chromium, 0.1 to 0.5% manganese, and 0.05 to 0.3% zirconium, which method includes solution heat treating the article and subsequently sub- jecting the article to a time and temperature effective for increas- ing the resistance to corrosion of the alloy over its resistance in the T6 condition, the time and temperature being from 10 seconds to 10 minutes and from 350 to 520°F, or else 435 to 520°F, respec-tively. An alloy consisting essentially of aluminum, 4 to 8% zinc, 1.5 to 3.5% magnesium, 1 to 2.5% copper, and at least one element selected from the group consisting of 0.05 to 0.3% chromium, 0.1 to 0.5% manganese and 0.05 to 0.3% zirconium, having a corrosion resistance increased over that of its T6 condition, with a solution potential lying in the range minus 825 to minus 935 millivolts, a yield strength lying in the range 46 to 72 ksi, a dislocation den- sity above that exhibited by aluminum alloy 7075 in the T73 condi- tion, denuded grain boundary regions, and grain boundary precipitate.
204543
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