Re: Caustic Soda Etch
You should be able to get a deep glossy finish on 6063 when all is right. I still don't have enough knowledge about your process to make any good guesses as to what the problem is. A good photo may be of some help.
There are many different things that could be causing the uneven color, from not having the part clean enough, some problem in the anodizing process, or even contamination once anodized but before or during dying.
What are you cleaning the part with, and does water sheet afterward?
How are you anodizing the part? (process specifics)
Are you using good clean water for rinses, and rinsing thoroughly after each step?
Are you carefull to not touch the part once cleaned, and is there any chance any solution has been contaminated with oil or grease of any kind?
What color of dye, and what kind of dye?
Dye PH?
Can you see the uneven color before sealing?
Have you sucessfully anodized other parts with good results using the same process?
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