Curated with aloha by
Ted Mooney, P.E. RET
The authoritative public forum
for Metal Finishing 1989-2025
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Etching aluminum with a matte surface
2003
Dear sir or lady:
Please let me know what is the formula to reach a satin finish for aluminum parts? I have been trying caustic soda ⇦liquid caustic soda in bulk on
Amazon [affil link]
etchant according to this formulation: 50% NaOH 4% sodium gluconate 1% sodium sulfide 25% TEA(triethanolamine) 0.1% ammonium persulphate reminder water but the final appearance is not what I need, I need a opaque and uniform surface aluminum profile after etching process.
If any one can help me I would appreciate very much! "thanks a lot"
- Isfahan, Isfahan, Iran
Try ammonium bi-fluoride at 1/2 to 1 oz per gal room temp after a good cleaner
Drew Nosti, CEF
Anodize USA
Ladson, South Carolina
2003
2003
You may try the following formulation and operation parameters:
Free NaOH = 50 g/l
Aluminum content = 28 g/l (with caustic soda ⇦liquid caustic soda in bulk on
Amazon [affil link]
recovery system) or 130 g/l with long life additives
(mainly sodium gluconate)
Temperature = 50 - 55 °C
Etching time = 10 - 13 minute
What aluminum alloy you are referring to, 6063. 6061 ...
THANK YOU,
- Selangor, Malaysia
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