-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics

topic 4177

Decorative Nickel Tank Problem: Passivation


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


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.


anders sundman
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden


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

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.