Alkaline etching of aluminum with matte finish and low waste...

Details Alkaline etching of aluminum with matte finish and low waste... Alkaline etching of aluminum with matte finish and low waste...

C - Chemistry, Metallurgy

23

F

C23F 1/36 (2006.01) B44C 1/22 (2006.01) C23F 1/46 (2006.01)

Patent

CA 2098813

2098813 9212276 PCTABS00014 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 ·C. Preferably, the etch solution is regenerated through a crystallization loop.

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