Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

World's #1 finishing resource since 1989
No login needed: Chime right in

topic 8562

Replating electroless nickel without stripping



2001

Dear friends,

I need your help on the following

Can electroless nickel be plated on a steel part that has spots of electroless nickel on its surface? Stripping is not allowed by any means, mechanical or chemical, so it has to be plated as it is.

If so, what steps have to be followed? degreasing by a NaOH solution, deoxidizing by 30%HCl and then nickel strike is OK?

Thank you

Christos Sigalas
- Athens, Greece

affil. link
"Electroless Nickel Plating"
by Wolfgang Riedel
from Abe Books
or
info on Amazon


2001

A. Maybe try activating with acid salt, consisting fluoride.

Ken [last name deleted for privacy by Editor]
- Singapore


2001

A. Not easy, but possible. Concentrations-times temperature-current/voltage are critical. Look at activation steps for nickel and then the base metal and try compromises between both. Old EN is not easy to activate. Use a strong acid low-nickel Woods Nickel Strike after acid activation.

James Watts
- Navarre, Florida


2002

Q. I encountered the following problem, advice needed: Racking mark was observed on nickel finishing on stainless steel, after gone through proper cleaning and strike in Nickel bath.

Solution composition as follows:
Nickel sulphate 300 g/l
Nickel Chloride 85 g/l
Boric acid 45 g/l
pH 4.4
Temperature 45 °C
Current Density 1~2 A/dm2 May Soh
- Singapore

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 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:

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


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