I anodized my first part, and I have a question. First of all here are the details... The part I anodized was a 4.75 X 3.0 square piece of aluminum sheet metal. 4.75 X 3= 14.25 in?. Multiply times 2 for both sides gives 28.50 in? total area. To figure current density of 4.5A/ ft? 28.5/144=.198 .198 X 4.5= 890 mA My power supply is a 24V 10A power supply connected to Fibergeeks VCCS circuit (thanks for the schematic fibergeek, the VCCS works great!). Anodizing bath is 3 gal. distilled water and 1 gal battery acid. Measured solution at 60?f ( I know this is a bit low, but I don't have a heater for the anodizing tank yet). Connected titanium wire to part by drilling a slightly undersized hole and forcing wire through. Cleaned part and it passed water break test. Placed part in anodizing tank, turned on power supply and set to 890 mA. The voltage began to climb, and reached 13.8V after about 3 minutes. After this it began to climb slowly until it reached 15.9V after 30 minutes. At this point it began to slowly drop (about .1V each minute), so I removed from the anodizing tank and rinsed. Dyed part black at 140? and sealed. The part took the dye well.
Here's my question (finally). In the manual it states that the peak voltage needed for 6A/ft? is 15V. I was running my part at 4.5A/ft? and my voltage went to almost 16. Also, PAR was reached quite a bit sooner than anticipated. What could cause this?
Here's my question (finally). In the manual it states that the peak voltage needed for 6A/ft? is 15V. I was running my part at 4.5A/ft? and my voltage went to almost 16. Also, PAR was reached quite a bit sooner than anticipated. What could cause this?
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