Has anyone done a controlled test of the same part at different current denisities as calculated by the 720 rule.
I am using 5 A/sq ft on a 28 sq inch part for 100 minutes and resut is pretty good. I would be interested if anyone has tried lower (say 3 or 4 A/Sq ft) and higher (6,8, 10 A/sq ft) with corresponding change in anodizing time with any ill effect.
One problem I do have is producing a current much more than 1 amp. My power supply can generate constant current up to 2 amp at 16 Volts but 16 Volts won't push more than 1 amp through the acid tank. This means path resistance of 16 ohm. Wire to part resistance measures < 0.5 ohm so the rest is conductivity of the acid (or lack of it). The acid is quite old (over 10 years) but has just been stored all that time. Tank is 7 ltrs (2 gal approx) about 12x8 inch, and has a lead sheet along the bottom and up two sides for a cathode.
I am using 5 A/sq ft on a 28 sq inch part for 100 minutes and resut is pretty good. I would be interested if anyone has tried lower (say 3 or 4 A/Sq ft) and higher (6,8, 10 A/sq ft) with corresponding change in anodizing time with any ill effect.
One problem I do have is producing a current much more than 1 amp. My power supply can generate constant current up to 2 amp at 16 Volts but 16 Volts won't push more than 1 amp through the acid tank. This means path resistance of 16 ohm. Wire to part resistance measures < 0.5 ohm so the rest is conductivity of the acid (or lack of it). The acid is quite old (over 10 years) but has just been stored all that time. Tank is 7 ltrs (2 gal approx) about 12x8 inch, and has a lead sheet along the bottom and up two sides for a cathode.
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