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公开(公告)号：EP0565544B1
公开(公告)日：1994-09-21
申请号：EP92901288.8
申请日：1991-12-20
申请人： ECO-TEC LIMITED
发明人： HUNTER, Robert F. , HOHN, Phillip
摘要： 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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