Metal treatment – Compositions – Heat treating
Patent
1981-10-15
1984-10-16
Dean, R.
Metal treatment
Compositions
Heat treating
148 206, 148159, 148417, C22F 104
Patent
active
044772920
ABSTRACT:
A three-step thermal aging method for improving the strength and corrosion resistance of an article comprising a solution heat treated aluminum alloy containing zinc, magnesium, copper and at least one element selected from the group consisting of chromium, manganese and zirconium. The article is precipitation hardened at about 175.degree. to 325.degree. F., heat treated for from several minutes to a few hours at a temperature of about 360.degree. to 390.degree. F. and again precipitation hardened at about 175.degree. to 325.degree. F. In a preferred embodiment the article treated comprises aluminum alloy 7075 in the T6 condition. The method of the invention is easier to control and is suitable for treating articles of greater thickness than other comparable methods.
REFERENCES:
patent: 3856584 (1974-12-01), Cina
Aluminum Company of America
Dean R.
Klepac Glenn E.
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