Method for providing environmentally stable aluminum surfaces fo

Details Method for providing environmentally stable aluminum surfaces fo Method for providing environmentally stable aluminum surfaces fo

1976-02-26

1978-04-18

Andrews, R. L.

Chemistry: electrical and wave energy

Processes and products

204 38E, 204 58, 156151, 428469, C25D 1108, C25D 1118

Patent

active

040850129

ABSTRACT:
Environmentally stable bond joints of aluminum metal and aluminum alloys in adhesively joined structures are formed by utilizing a prebonding anodization of the aluminum surfaces in a phosphoric acid electrolyte containing from about 1.5 to about 50% H.sub.3 PO.sub.4 at 1 to 50 volts for a period of 5 to 60 minutes using a bath temperature of 50.degree. to 100.degree. F. The anodized surface is then washed free of electrolyte, dried and coated with an adhesive resin. The aluminum metal segments are then arranged in a composite arrangement and bonded together under pressure and heat to cure the adhesive resin. The resulting structure is resistant to failure of the bond joints on exposure to moist atmospheric conditions. The surface preparation provides a hydration resistant aluminum oxide surface which minimizes adhesive-aluminum separation under aqueous exposure. Alloys containing copper and other alloying constituents may be successfully anodized and bonded by this process.

REFERENCES:
patent: 2036962 (1936-04-01), Fischer
patent: 2430468 (1947-11-01), Julich et al.
patent: 3594289 (1971-07-01), Watkinson et al.
patent: 3672972 (1972-06-01), Dorsey
patent: 3734784 (1973-05-01), Bereday et al.
patent: 3798096 (1974-03-01), Grunwald et al.
patent: 3799848 (1974-03-01), Kolic et al.
patent: 3945899 (1976-03-01), Nikaido et al.
Surface Treatment of Al by Wernick et al., 3rd Ed., 1964, p. 759.
"The Surface Treatment and Finishing of Al", by Wernick et al., 3rd Ed., 1964, pp. 284-286.
"American Wrought Alloys", Aluminum, S. Wernick, 1964, p. 759.

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