Home /
Search 🔍
the Site

Chime right in! (no registration req'd)


"Electroless plating starts fast, then slows to a stop"

March 2, 2010

Hi dears;
I work in a ball valve manufacturer we plating all of parts that use in ball valve.
After plating start, rate is very good but suddenly plating stop.
What's the matter?

plating shop employee - TEHRAN, IRAN

First of two simultaneous responses -- March 4, 2010

EN baths have to be "poisoned" or calmed down to control the catalytic reaction and avoid spontaneous decomposition. Bare ferrous surfaces are generally far more active or catalytic to the reaction than EN itself. So, it is normal to have a higher speed of reaction initially. Once a layer of nickel has formed, that speed slows down but it should not stop. If it does, it means your bath is out of balance. If you are buying from a dedicated vendor ask him. If you are using an empiric formula you are on your own. G. Marrufo-Mexico

Guillermo Marrufo
Monterrey, NL, Mexico

Second of two simultaneous responses -- March 4, 2010

What type of electroless plating are we talking here? Is it electroless nickel?

Mark Baker
process engineer - Malone, New York

April 7, 2010

Yes it is electroless nickel.
Please give me more explanation about out of balanced bath.


First of two simultaneous responses -- April 8, 2010

Chain reaction. That is what an electroless bath wants to do. Certain chemicals are added to calm that reaction down. The amount added is very critical. If you add just a little bit more the bath stops. Most of the time it can be reactivated. But again, if too much activator is added, the chain reaction may start again. Not easy. That is why patented or secret chemistries cost more and still people buy them.
If you cannot or do not want to afford a patented formula, keep trying. When you have succeeded, if you do, it would be perfectly honest for you to expect a profit or a commercial advantage in return for your effort and expenses.

Guillermo Marrufo
Monterrey, NL, Mexico

Second of two simultaneous responses -- April 8, 2010

I hope I am not infringing on Mr Marrufo's reply over a month ago. As you probably know there are make up chemicals and chemicals you have to add as the bath plates out Ni. Bath make-ups have different agents like a reducing agent, stabilizer, complexing, and Ni metal. One of these is most likely out of balance. A mistake could have been made at the time of addition. Lab analysis should tell you where the problem is but after a month, I'm sure you have the problem under control.

Mark Baker
process engineer - Malone, New York

April 29, 2010

If you are using a proprietary solution, confirm the stabilizer addition in your solution. More stabilizer cause slow plating. Are you seeing any patch marks over plated components? Try dummying before actual plating

- Mysore, Karnataka, INDIA

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA