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Robert H Probert Editor's
note: |
Mr. Lauf.
Please check your rinse water following deoxidizing. I've been
experienced that overly effective rinsing after deoxidizing aluminum
surfaces can adversely affect the surface appearance after conversion
coat application. The rinses to get a little
¡°dirtier¡± and ultimately, improve the
appearance of the coating.
Don't forget parts are to be processed from one step to the next
without allowing the parts to dry.
D.Y.YOO
- BUSAN, KOREA
Mr. Lauf,
I agree with D.Y.Yoo in that extending cleaning and deoxidizing times
is not always the best solution to your problem. Sometimes cutting
back your times a bit might be the trick (the less chemistry you have
touching these pieces the less failure modes you'll have). Also, you
should get good color in your irridite bath within a couple minutes -
and start getting problems after more than a few, try cutting those
times back a bit too.
The idea is to remove the thin layer of natural oxide on the aluminum
without going too deep beyond the surface. Try combinations of
shorter cleaner times / longer deox times. Then longer cleaner times
/ shorter deox times. Don't look for a reason, you'll go crazy - just
look for what works.
Depending on the volume you have going through these tanks, your
"solution strengths" look good is half the battle, but how are your
contaminant levels in your cleaners, deoxidizer, and irridite?
Good luck to you!
Christopher D. Arfman
- Seattle, WA, USA

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