In reference to: "The LCD Anodizing System" manual, on page 8, under section heading "Operating the Anodizing System", paragraph 6, it states that the duration of the anodize is between 1-3 hours, based on reaching PAR. Im trying to determine how to get to this PAR value. Here's my issues:
1) When I anodize for 90 mins at 4.5A/sqft, I don't get a good anodize, I find that I must run longer than this for the part to get a good uniform anodize layer. When I anodize untill the part stops bubbling, I get much better looking results.
2) For reasons that I do not understand, both the current and voltage remain constant during the entire process. The voltage does not increase as expected (due to increased resistance and Ohm's law: I=V/R). I noticed that the bubbles from the part decrease significantly after a longer time than 90 mins, but well within the limits posed by the operating instructions as referenced above.
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