Quote:
Originally Posted by johnnie7
hi guys
i popped into maplins and the guy said to try this unit with CC http://cgi.ebay.co.uk/Maplin-Bench-P...QQcmdZViewItem
this is the 1st proper power suplly i have used...the parts i am anodiseing are about the size of a fag packet
i started at 0.20 amps at about 14volts...and the weird thing is the voltage constantly dropped to about 6v with same 0.20 amps over about 90 mins 
surely the voltage should have risen as the anodised layer created more resistance...could it be that my bath has to much acid? or is it just this power suplly is just not suited??
any help would be much apprecated 
john |
From you description of the PS, it is working as it should. The anodizing run sounds like a bad connection to the part.
What acid ratio is you solution?
How are you hooking the part up?
If your fag packs there are the same size as here, your current is too low. The approximate size here is 2" x 3". That's 6" squared x 2 sides = 12" squared of surface area (SA) if the part is a flat plate. At a 4.5A CD, you should run at .38A for 1 part 160 minutes to get a 1 mil coating.
Did you try to dye and if so what were the results?
You may already know but just a note on the PS.
Turned off, make your hook up to the part.
Turn the Voltage all the way up and the amperage all the way down.
Turn on the PS and slowly dial the amperage up to the desired setting for the run.
SS