Re: Low Voltage
Without all the details I have read between the lines a little. It appears to be a couple of things off not much but together enough to cause your problem. Anodize time is directly related to the CD run. If you ran the part for 2 hours, that was enough time for a 1 mil coating at 6 ASF. I also calculated 70.69" SA, which at 6 ASF gives an amp setting of 3A (2.95A). Did you not calculate the edge of the part? With a 2.6A setting your anodize time was in excess and caused dissolution.(larger pore size mainly in your case). As for your low voltage. What was the tank temp. and how was your agitation? The higher the tank temp and the lower the amount of agitation will lower the voltage needed to push the set amperage and cause dissolution. What was your peak voltage during the run? The peak voltage calculated in the 720 rule has many parameters influencing it. A higher tank temp or acid concentration(possibly from low tank level from evaporation) and miscalculated SA will all lower you peak voltage.
In general it sounds like the pore size is a little too large to hold the dye well. Let us know what you find out or if any of this was the problem.
SS
cameraman,
FYI - higher CD's and lower tank temps will give smaller pore sizes.
SS
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