another rookie question for you seasoned vets....

[pmac2002]

Will a 3amp rectifier be better to anno than a battery charger?

I know from the calculator it says 6amps for x amount of minutes. Would the time be doubled if using 1/2 the amps?

thanks

Paul

[sswee]

Originally Posted by pmac2002

Will a 3amp rectifier be better to anno than a battery charger?

I know from the calculator it says 6amps for x amount of minutes. Would the time be doubled if using 1/2 the amps?

thanks

Paul

A CC rectifier is the best to use.
That is 6 amps per square foot. You need to figure the surface area of the part to know how much current to use.
SS

[pmac2002]

ok not sure but right now all that is avvailable at caswell is the 3amp rect. according to the calculator this is going to just take a bit longer to anno?

also should I be using 1 to 1 for acid to water or 1 acid to 3 water?

thanks

Paul

[sswee]

The 3A rectifier from Caswell will work much better than a battery charger.

Use 1 part battery acid to 3 parts distilled water.

The anodize time required is directly dependent on current density. A 3 ASF (amps per square foot) is the lowest CD you want to use for anodizing. Any lower and the pore size will be too large to hold dye.
SS

[rclint]

So if you have a sqaure piece of sheet aluminum (we wil not count sides because it's so thin) 4" tall by 5" wide

With the 3 amp power supply your talking about here is what it could come out as

4"x5"=20" you have two sides, so 20" x 2 = 40" total

You would run in CC mode, set the amps to 1.67 for a 6 amp current density run 84 minutes for a .7 mil coating

Hope this helps you figure out how to calculate the surface area compared to current density and what size power supply you need. On a normal part you measure out everything as close as you can for the square inches, then add them all up.

Clint

[pmac2002]

I have purchased a dc power supply that is 10amp 30volt! thanks for all of your help guys!

Paul