The authoritative public forum
  for Metal Finishing since 1989


-----

Anodising Aluminium: Concentrations Measurement

2000

We have a small anodising unit for aluminium nameplates. We use the standard conditions: 15 Amps/sq ft, temperature 20 C, electrolyte sulfuric acid 11%. I want to control the aluminium concentration and the sulfuric acid concentration. I thought our aluminium concentration should be 5-15 g/liter.

I know that there are different ways of measure it:

• - colorimeter
• - gravimeter
• - titration
• - hydrometer
• - pH meter

I want to know the following things: - which of them are the most suitable for the standard anodising conditions and for a small unit like us. - do the limits of aluminium concentration precise enough to give a good quality. Thank you for your advices and your answers. Merci. Cedric ODY

Cedric ODY
- Dublin, Ireland

---

Try to stay below 10 g/l Al and use a titration for control. Get back to us if you need analytical methods.

James Totter, CEF
- Tallahassee, Florida
2000