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Coating thickness problem

Hi,
I'm doiing sulfuric acid anodizing MIL 8625 e .
I'm performing the same parameters voltage 12-18 volts,bath conc.200g/l, temp 16-18c,
and time 35 minutes but I'm not getting the appropriate thickness, my req.is 15 micron but I'm getting only 8 micron?
can any body explain what are those parameters which can increase thickness,
thanx

IFTIKHAR
precision engineering - Karachi, Pakistan
2005

Different alloys behave differently, including requiring different voltages. What alloy are you anodizing?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2005

Forget the 12 volts! 15 is a practical minimum and 18 is far far better.

James Watts
- Navarre, Florida
2005

For predictable results 12-15 Amps/sq.ft is even better than that! Although, on complex loads, anodizing by current density is not always feasable.

Marc Green
anodizer - Boise, Idaho
2005

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