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anodizing etch -Reply

Caustic etching creates aluminum hydroxide sludge that must be dealt
with either by regeneration ( best ) or disposal.  Furthermore, caustic
etching smuts the aluminum ( turns it black ) and requires a acidic ( nitric
acid/ HF ?) desmut stage and another rinse.

On the plus side, causic etching yields a more uniformly etched surface.
John O. Sparks
Design for the Environment
MC 7406
401 M St. , SW
Washington, DC 20460
Telephone 202-260-1682
FAX 202-260-0981
e-mail sparks.john@epamail.epa.gov