C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/24.5
C25D 11/04 (2006.01) B32B 15/20 (2006.01) C25D 11/08 (2006.01)
Patent
CA 1118708
ABSTRACT OF THE DISCLOSURE 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 using an electrolyte bath temperature of 50° to 85°F. The anodized surface is then removed from the electrolyte bath and washed free of electrolyte within from one half to two and one half minutes from cessation of anodizing current, dried and coated with an adhesive resin. The anodized aluminum metal surfaces are then juxtaposed with an adhesive resin 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 porous hydration resistant aluminum oxide surface which minimizes adhesive failure at the oxide-adhesive interface under aqueous exposure. Alloys containing copper and other alloying constituents may be successfully anodized and bonded by this process.
270187
Firminhac Ralph H.
Marceau J. Arthur
Moji Yukimori
Boeing Company (the)
Smart & Biggar
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