No passwords, No popups, No AI, No cost:
we earn from affiliate purchases

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
ted_yosem
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
  mfhotline


  -----

Bad chromium coverage of nickel products




Hi all,

We are plating chromium on nickel. The problem we have is a bad coverage of the nickel. We use a HEEF chromium bath. Who can help ?

Jan-Henk
- Deventer, Nederland
2002



First of three simultaneous responses --

Hello, Jan. Step 1: chromium plate a hull cell panel and tell us the bright range. Good luck.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2002



Second of three simultaneous responses --

Jan-Henk,

Maybe the nickel area is not active, or you have a wrong designate anode. Also the trivalent chrome is high. Try to start the plating with a low current 1,2 A / dm2 for five minutes rise the current to 6,0 A/dm2 for 2 minutes and after that give it a high current strike for 30 seconds. After this reduce the current to normaly CD.

Regards,

Anders Sundman
Anders Sundman
4th Generation Surface Engineering
Consultant - Arvika,
Sweden

2002



Third of three simultaneous responses --

Much more information is required to offer you suggestions. What is the analysis of the chrome bath? Temperature? Condition of the anodes? Are the parts going directly from nickel plate, rinses, wet, into the chrome? Are the parts being "staged" in the final rinse causing the nickel to become passive? Maybe the final rinse before chrome plate is badly contaminated. What do the parts after chrome look like?

Bill Hemp
tech svc. w/ chemical supplier - Grand Rapids, Michigan
2002



HEEF is a functional chromium chemistry and you should be using a decorative chromium chemistry. The functional chemistry typically operates at higher temperature, bad for coverage in decorative chromium plating, and a lower ratio of chromium to sulphate, also bad for coverage. You should talk to your salesperson and get the right chemistry for the job.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina
2002




(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:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"