anno question????????

[pmac2002]

My buddy tried to anno some test pieces...he used some cocker parts that he had around to practice...they were anno'ed for about 2 hours...then dyed in the caswell blk dye and sealed with the chem sealer!

but the pieces went into the anno process shinny and have come out of the coloring phase very dull!? any ideas?

thanks

Paul

[sswee]

Some detailed specs on the parameters of the run will help diagnose a problem.
SS

[pmac2002]

cocker back block about...1 by 3 inch by 2 inch...in the anno bath for 3hrs about 10 amps....my budy hand pollished with a cloth no polish! and it buffed out blk....he did not use the de smut!

what do you think!

paul

[sswee]

A block 1x3x2 is about 22" SA. 10 amps on 22 square inches of the part is about a 65.5 amp current density. If you could anodize at that rate, it would only take approximately 11 minutes to grow a 1 mil coating. Something isn't right with your calculations, method or measurements.
What kind of power supply are you using?
Do you use the 720 rule?
Do you check the tank temp before or during a run?
Do you have tank agitation?
What acid ratio are you using?
SS