Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1991-03-15
1993-02-09
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
156664, 156665, 156666, 252 792, 252 794, 427309, B44C 122, C23F 100
Patent
active
051850575
ABSTRACT:
The invention provides a process for etching a metal surface by applying, to the metal surface, a solution of ferric chloride at an effective concentration, which solution also contains phosphoric acid. The etching is done in an etching tank and the effective concentration of ferric ions is maintained by diffusing an oxidizing agent which is chlorine gas or a compound which forms HOCl in solution through the tank. A number of other steps which may vary according to the type and grade of metal surface which is to be etched are also performed in terms of the process of the invention, both before and after the application of the etching solution to the metal surface. Metal surfaces etched according to the invention have a coating, for example polytetrafluoroethylene, subsequently applied thereto.
REFERENCES:
patent: 2886420 (1959-05-01), Jones et al.
patent: 3115419 (1963-12-01), Dale
patent: 3761331 (1973-09-01), McClanahan
Abstract No. 27337 "Microetch Solution of Aluminum" 2244 Research Disclosure No. 273, Jan. 1987, p. 28.
Excerpts from "The Surface Treatment and Finishing of Aluminum and its Alloys", S. Wrnick and R. Pinner, 5th Ed.
Jutland Development CC
Powell William A.
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