I am having allot of issues trying to get parts to take dye. Here is my routine...
*Part is made from 6061 t6 with a surface area of 90.72 inches^2.
1)Degrease with dawn soap (pass water break test)
2)Lye bath (3 table spoons lye to 2 gallons distilled water) for 5 min. at 60 deg.
3)Rinse with distilled water
4)De oxide / desmut dip for 10 min (part appears white) (temp is only around 70 deg but it appears to be fine at that temp)
5)Rinse with distilled water
6)Ano bath per 720 rule (CD at 6 amp, Thickness at .7 mil, so that's 3.79 amps at 84 min.) The part becomes dull. Acid temp is 60 deg
7)Rinse with distilled water
Place in grey BK dye at 140 deg for 10 min.
Dye is barely noticeable. I am using a 50 amp 30 volt CC / CV power supply.