Chemistry: electrical and wave energy – Processes and products
Patent
1977-08-15
1978-11-28
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
204 38E, 204 58, 428416, 428469, C25D 1124
Patent
active
041274512
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 using an electrolyte bath temperature of 60.degree. to 85.degree. 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 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 to the oxide-adhesive interface under aqeuous exposure. Alloys containing copper and other constituents may be successfully anodized and bonded by this process.
REFERENCES:
"The Surface Treatment of Al and its Alloys", by S. Wernick et al., 1964, p. 597.
Firminhac Ralph H.
Marceau J. Arthur
Moji Yukimori
Andrews R. L.
The Boeing Company
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