Letter 10060

White spots on dyed 2024 

I'm having trouble with white spots when anodizing and dying 2024 T3 aluminum. Usually the parts are machined all over and seem to have little pin holes where the spots are. What am I doing wrong? Am I zapping the parts with too much electricity? My current solution is at 19% and I am anodizing at 16 volts. I have a 1000 amp rectifier.

Please forward any solutions.

Bill Smith
Industrial Anodizing Corporation - Trinity, NC

How many minutes do you anodize and at what temperature?

Dado Macapagal
Quality Anodizing - Toronto, Ont

Answer or follow-up on this subject (in non-commercial fashion).

 

Post a question on a different subject.