Bad Parts

[barry700]

Does anyone know what is wrong when one area of the part does not anodize and just dissolves away? It usually happens on an end, but I have also seen it happen in the middle where it was racked.http://forum.caswellplating.com/imag...n_question.gif

[sswee]

What kind of material or part are you dealing with?
SS

[barry700]

The parts are valve spools and the material is 2011 T3.

[Tim Wiltse]

2xxx series is not the greatest to anodize. It has alot of copper content in it and it's coating will offer poor protection. I would dare to say cut 1/4 of the normal time off it being in the tank and see how it does. I bet it's leaving nasty smut on the part towards the end of the run and the piece is turning a lemon color.

Later,
Tim

[barry700]

Originally Posted by Tim Wiltse

2xxx series is not the greatest to anodize. It has alot of copper content in it and it's coating will offer poor protection. I would dare to say cut 1/4 of the normal time off it being in the tank and see how it does. I bet it's leaving nasty smut on the part towards the end of the run and the piece is turning a lemon color.

Later,
Tim

Hi Tim, You really seem to know what you are talking about. I guess I have not described the problem well enough. Check out the photo. Both parts were identical when they went in.
(I hope I have found how attach a small photo)
Thanks, Barry

[acidrain]

I agree with Tim, but suggest cutting the time even further to 1/2 calculated time.
The bad areas could also be attributed to being too close to the cathode, poor agitation, or tank temp too high. What are those parameters?

[Tim Wiltse]

Acidrain makes very good point as well!

LAter,
Tim