Caustic etching of aluminum with matte finish and low waste capa

Details Caustic etching of aluminum with matte finish and low waste capa Caustic etching of aluminum with matte finish and low waste capa

1990-12-31

1992-02-25

Powell, William A.

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156665, 156345, 252 795, B44C 122, C23F 100

Patent

active

050910469

ABSTRACT:
A process for etching aluminum in caustic solution capable of providing a consistently uniform matte finish like that of the never dump process, but with little waste like the regeneration process. Etching is performed in a solution containing free sodium hydroxide and dissolved aluminum in a ratio between about 0.6 and 2.1 g/l and also containing an etch equalizing agent at a temperature above about 70.degree. C. Preferably, the etch solution is regenerated through a crystallization loop.

REFERENCES:
patent: 2795490 (1957-06-01), Newman et al.
patent: 2795491 (1957-06-01), Newman et al.
patent: 2975041 (1961-03-01), Holman
patent: 4372805 (1983-02-01), Takahashi et al.
patent: 4417949 (1983-11-01), Lindner et al.
Brown, Craig J., "Regeneration of Caustic Etch Solutions for Aluminum", Plating and Surface Finishing, Jun. 1982.
Kape, J. M., "Chemical Etching of Aluminium in Caustic Soda Based Solutions", Transactions of the Institute of Metal Finishing, 1970, vol. 48, p. 43.
Wernick, J.; Pinner, R.; and Sheasby, P.G., "The Surface Treatment and Finishing of Aluminium and Its Alloys", 1987, pp. 191-203.
Meserve, H. O., Jr., "Chemical Milling Applied to Jet Airliner Body Skins", Plating, Jan. 1969, p. 44.

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