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letter 48431

Trivalent chromium plating bath gives parts uneven yellowish color


April 8, 2008

Q. We have made up a Trivalent chrome plating tank for our company,the technology is supplied by Macdermid Inc. [a finishing.com supporting advertiser] named "TriMacIII"; but we have trouble now...
When we plate a round panel that has a diameter of 20 mm, we have 4 parts a rack, but the two placed on the lower position on the rack alway have some strippled yellow color;
The Hull cell test is ok, we don't know why?

Frank Liou
Plating shop employee - Guangzhou City, GuangDong Province, China


April 9, 2008

A. I think I would call my MacDermid guy. Barring that, you might want to look at your rinsing.


Trent Kaufman
   electroplater
Galva, Illinois



April 10, 2008

Q. The engineer from Macdermid gave me some useful advise, Electrolyzing with Dummy cathode at 5 ASD. 2 hours later, the yellow stripe disappears, we think there's too much additive in my tank.

By the way, the anode we used is not supplied by Macdermid, but our anode uses the same surface treatment: [deleted by editor] -- do you think it works?

Frank Liou [returning]
- Guangzhou, Guangdong Province, China


thumbs up sign Hi Frank. You've just seen one advantage of working with the supplier: quickly knowing what to do when something goes wrong. In obtaining your own anodes you might lose some of that advantage.

You or your anode supplier are reverse engineering the anodes to copy them; and if they work, fine. But, considering the anonymity of the internet, we can't post questions or comments about what surface treatment Macdermid uses -- that's too close to crowd sourcing of industrial espionage :-)

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



Excessive nitrates in Trivalent Chrome plating bath?

May 18, 2017

Q. Dear all

We are also using Macdermid Inc. [a finishing.com supporting advertiser] Trimac III. We are facing the issue of coverage; we were told that bath is contaminated with nitrates and requires changing the bath. Kindly suggest.

Regards
SNEHAL

SNEHAL PATIL
- PONDA GOA, India


May 23, 2017

A. You may need to adjust pH; add sodium carbonate to reach your operating pH.

Asmaa el-sayed
Chemical Engineer - Alexandria, Egypt



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