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Dwell Time Before Seal Test?



(-----) 2006

Is there a standard dwell time anodizers wait after completion of seal and rinse before performing the seal test (nitric/black dye)? Our current procedures specify a 5-24 hour wait time, which is quite inconvenient from a lean manufacturing perspective, but I can't find where that came from. Was just wondering what others' practice/procedures were.

Thanks,

Wayne VanTassell
metal finishing - Salt Lake City, Utah
^


2006

I presume you are using conventional HOT sealing, in that case there is no dwelling time - you can conduct your test after the process. On the other hand if you are using cold sealing then you may have to as per the recommendation of the chemical supplier. Hope this answers to your question.

Srimay Basu
Dubai Aluminium - Dubai, U.A.E.
^


2006

After sealing, there is no dwell time before testing except to cool to room temperature. Some dye may need time to reach peak stability, especially if cold sealed.
Your best resolve would be to discuss with the client for the reason, if any, behind 5-24 hour wait in the procedure.

Kas Amadi
- Dayton, Ohio
^


2006

The practice with the wait time was inherited, so I don't have the originator to ask, but we have begun performing the seal test immediately after the parts cool, with very good results.

Thanks for the feedback.

Wayne VanTassell
- Salt Lake City, UT, USA
^

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