Chemistry: electrical and wave energy – Processes and products
Patent
1986-10-24
1988-12-27
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
20412995, C25D 544
Patent
active
047939036
ABSTRACT:
An aluminum alloy article is anodized in an aqueous solution of phosphoric acid. Oxide forms on the surfaces of the article and dissolves as it forms to displace contaminants and deoxidize the surfaces. The anodizing etch rate is from about 0.0002 to about 0.0005 inch/surface/hour. Residual oxide on the surfaces is a maximum of about 3000 Angstroms. The article may be left in the solution following anodizing to dissolve a portion of the residual oxide. Preferred anodizing parameters include 15 to 25% by weight phosphoric acid, 75.degree. to 95.degree. F., and 4 to 10 volts. Usual anodizing times are from 5 to 10 minutes. Following deoxidation, the article is ready for subsequent processing, such as anodizing to provide a controlled thickness porous oxide coating followed by adhesive bonding.
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Holmquist Howard W.
Tarr Larry E.
Andrews R. L.
Pauly Joan H.
The Boeing Company
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