Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1997-11-21
1999-06-15
Ryan, Patrick
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148415, 148440, 148689, 148688, 420542, 420543, 420548, 420550, C22F 100
Patent
active
059118458
ABSTRACT:
A high-strength extruded article of an age-hardening aluminum alloy capable of educing an achromatic dark gray color after the anodizing treatment thereof and a method for the production thereof are disclosed. The method comprises subjecting an alloy billet comprising 0.9 to 3.0% by weight of Si, 0.3 to 0.6% by weight of Mg, less than 0.3% by weight of Fe, and the balance of Al and unavoidable impurities or an alloy billet comprising 0.005 to 0.1% by weight of Ti either alone or in combination with 0.001 to 0.02% by weight of B besides the components mentioned above to a soaking treatment at a temperature in the range of from 350 to 480.degree. C. for 2 to 12 hours, extruding the soaked alloy billet at a billet temperature in the range of from 380 to 450 .degree. C., and subjecting the extruded alloy to an aging treatment at a temperature in the range of from 170 to 200.degree. C. for 2 to 8 hours. By the use of this method, there is obtained an extruded article which contains precipitated metallic silicon particles uniformly distributed therein and including those of particle sizes in the range of from 0.1 to 2 .mu.m in a proportion of not less than 85% of the total number of the precipitated particles and has the ability to educe a dark gray color of an achromatic color tone in consequence of a subsequent anodic oxidation thereof.
REFERENCES:
patent: 4174232 (1979-11-01), Lenz et al.
Chiba Hiroshi
Fukagawa Kazuyuki
Kawase Kengo
Satomura Mitsunao
Yamamoto Shoso
Elve M. Alexandra
Ryan Patrick
YKK Corporation
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