No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing since 1989

-----

Trivalent Black chromate on Zinc Die-cast part (Zamak 5) isn't consistent

2007

Hi,
This is my first time dealing with Zinc Die-cast parts with Trivalent Black Chromate and would like to know if it is able to achieve a good cosmetic finish?
Currently I'm seeing a non-uniform Finishing on my product which have patches of exposed metal which is unacceptable.
My plating house had claimed that Trivalent Black chromate could be easily "fades" due to handling issues, especially my parts need to go through a secondary machining process after plate. (To ensure the conductivity of the part).
Is there any ways to improve this situation?

Thanks,
Calvin

Calvin Lim
Engineering Assistant - Singapore

All things considered, the following may not be a great suggestion, but the best way to get consistent black chromate on the parts is to zinc-iron plate them first.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2007

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: