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6/1/2002

Aluminum Bright Dip

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Question: Can you give me a good formulation for an aluminum bright dip?

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Question:

Can you give me a good formulation for an aluminum bright dip? S.D.

Answer:

Here is a basic formulation.

Phosphoric acid (85%)

94% v/v
Nitric acid (42°Bé) 6% v/v


Use at 180-185F.

Another formulation based on the old “Kynalbrite” process has the following formulation:

Phosphoric acid

78% v/v
Nitric acid 11% v/v
Sulfuric acid 11% v/v
Ferrous sulfate 0.8% oz/gal


Use at 95-100C. This bright dip generates a lot of fumes and should only be used where good ventilation is available.

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