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A solution and process for microetching a high reflectivity aluminum surface to uniformly dull the surface.
English (United States)
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Microetch Solution for Aluminum
A solution and process for microetching a high reflectivity aluminum surface
to uniformly dull the surface.
An aqueous ferric chloride solution of about 50 percent is employed at room
temperature to etch high reflectivity aluminum surfaces, giving a finely grained
dull surface. Heating the solution to about 125 degrees Fahrenheit gives a
slightly finer grained etch, but care must be exercised due to the rapid etch rate
at elevated temperatures.
An exemplary process comprises: 1. Pre-clean and degrease in mild
alkaline electric cleaner. 2. D.I. water rinse. 3. Pre-etch in 25 percent sodium
hydroxide solution for 30 seconds to 1 minute. 4. D.I. water rinse. 5. Etch in 50
percent ferric chloride solution for 30 seconds to 1 minute. 6. D.I. rinse. 7.
Desmut and final etch in solution of: 750 ml/l Nitric Acid (Reagent Grade) 1-2
minutes 120 g/1 Ammonium Bifluoride (R.G.) 8. D.I. Rinse.