Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Decorative Nickel Tank Problem: Passivation





2000

Hi, I'm in the decorative chrome business and I have encountered a problem with my nickel tank whereby I am getting nickel passivation. When I place a piece into the chrome tank, I get a "root beer" effect, e.g. brown spots on the parts. So far, I have tried

I should point out that the nickel solution in use is fairly new on the market which leads me to believe that perhaps there is a flaw with the solution itself. However, any help or suggestions to my problem will be much appreciated. Thanks.

Jack Prevost
- Quebec, Canada



2000

Hi Jack.

How long time is it between nickel plating and the chrome plating when you move the part from nickel to chrome solution. Also you can have too much brightener in nickel solution. Maybe you turn on the current too fast? -- let the part obtain the chrome solution temperature before you raise the current.

Regard

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




2000

Dear Jack:

We have experienced this in the past from time to time. We have found that if the pH is too high (>5.0) in the bath or the dead rinse the problem sometimes arises. I say sometimes, because this is not always the case. Most of the time if we lower the dead rinse too between a pH of 3.0 to 5.0 with sulfuric acid the problem usually goes away. This may not be the cure, but it gives you something to try. KH

Ken Hutchinson
- Minneapolis, Minnesota


none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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:

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


About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA