Chemistry: electrical and wave energy – Processes and products
Patent
1978-03-23
1980-09-30
Mack, John H.
Chemistry: electrical and wave energy
Processes and products
204 35N, 204 37R, 204 38A, C25D 1118, C25D 1120, C25D 1122
Patent
active
042253985
ABSTRACT:
The corrosion resistance of an anodically oxidized surface film on aluminum articles is improved by sealing micropores and the like in such surface film with an aqueous sealing solution or dispersion containing siliceous material, such as silicic acid or a silicate, therein and thereafter overcoating the so-sealed surface with a select coating composition. The aqueous sealing solution is brought into contact with the aluminum article, such as by dipping the article into the solution and drying the so-coated article. Optionally, an electrical voltage may be applied through the sealing liquid and through the aluminum article during the sealing process. Further, in certain embodiments an electrical voltage may be applied through the sealing liquid before the liquid contacts the aluminum article. If desired, the surface of the aluminum article may be colored prior to sealing.
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Fred Pearlstein, Sealing Anodized Aluminum, Metal Finishing Aug. 1960, pp. 40-43.
Wernick and Pinner, Surface Treatment and Finishing of Aluminum _and Its Alloys, Robert Draper, Ltd. 1956, pp. 354-369.
Hasegawa Mutsuo
Hayashi Shinji
Hirono Hatsuo
Nagata Katsuyuki
Yamagata Hiroshi
Leader William
Mack John H.
Yoshida Kogyo K.K.
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