The authoritative public forum
  for Metal Finishing since 1989
  

  -----

Need Bright Dip Mix

I have an anodizing business and would like to set up a bright dip tank. Is there a proprietary bright dip available? If not, I will get a bright dip mixed. Could anyone please give me the acids used and their mixing ratio?

Thank you - Kind Regards

Steve Power
Helipower Engineering Ltd - Nelson, New Zealand
2001

---

2001

Dear Steve,

Here the information for bright dipping processes on Aluminium.

There are several bright dipping processes for aluminium:

• a) chemical bright dipping process with nitric acid.
• b) chemical bright dipping process without nitric acid for satin finish.
• c) electrolytic bright dipping processes without chromic acid.

And the ratio ( the amount of nitric acid ) is hanging up from the companies processes.

If you decide to use nitric acid, be also careful with the ventilation.

Regards,

FREDI YARCAN
- Istanbul, Turkey

---

YOU COULD TRY THE FOLLOWING BRIGHT DIP FOR ALUMINIUM:

ORTHO PHOSPHORIC ACID 87 % BY VOLUME

SULFURIC ACID 7% BY VOL

NITRIC ACID 6% BY VOL

THIS SOL WORKS FOR BOTH DIP AND ELECTROLYTIC PROCESS THE DIFF TEMP ARE REQUIRED THOUGH DIPPING TEMP SHOULD BE 85 - 90 °C ELECTROLYTIC PROCESS TEMP 45 DEG CENT CURRENT DENSITY 150 AMP/SQ FT VOLTAGE REQ WD BE ABT 20 VOLTS

VINEY CHADDHA
- DELHI, INDIA
2001