Can you give me a good formulation for an aluminum bright dip? S.D.
Here is a basic formulation.
Phosphoric acid (85%)
|Nitric acid (42°Bé)||6% v/v|
Use at 180-185F.
Another formulation based on the old “Kynalbrite” process has the following formulation:
|Nitric acid||11% v/v|
|Sulfuric acid||11% v/v|
|Ferrous sulfate||0.8% oz/gal|
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Use at 95-100C. This bright dip generates a lot of fumes and should only be used where good ventilation is available.