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Bright clear type II anodizing in extrusion profiles

I want help to obtain the most bright possible in 6063T5 extrusion aluminum, actually I buffing with an excellent bright, but when make anodize the bright reduce up to 30% or more, my anodize conditions are 160 g/l sulfuric acid, 8 g/l aluminum, 77° F temperature, 13 volts, 116 a/m2 current density, 12 minutes in anodizing bath and I seal it with cold seal solution.

tanks,

Marco Lopez
- Guadalajara, Jalisco, Mexico
2006

Decrease your temperature to 72F and use 15 volts, 16 to 18 V would be better. A combination of these two steps should give you most of your luster back. Note that your anodizing time will decrease for the same thickness.

James Watts
- Navarre, Florida
2006

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How bright you want? what is the range of gloss you need?
I can get gloss reading 70 while thickness around 10 µm.

John Hu
- Singapore
2006