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Ni/Zn Passivate adhesion post Ni/Zn plate
We have been using a Zinc-Nickel plate tank for sometime now using the E-Bright solutions provided by EPI (Electrochemical Products Inc.) [a finishing.com supporting advertiser]. We are also using the post chromate treatment (Ni/Zn Passivate). Well we had been using that post chromate at an ambient temperature and then Boeing came in and said that it had to be at 100F ± 5F per BAC 5637. Since raising the temp to 100 °F, we have had nothing but adhesion problems which were not there prior to raising the temp. The manufacturer recommends 70-85 °F, has anybody else out there had any situations like this? Can you offer any advice or suggestions?
I would appreciate any help.Tony Schmaltz
- Kent, Washington
Bath temperatures above 90 °F cause a loose deposit according to the following reference. Jack Kinder, "Chromate Conversion Coatings" American Electroplates' Society, Inc., 1986.
Best Wishes,Mary Cera
- OKC, OK