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





-----

Electroless plating on Stainless Steel





October 14, 2010

Hi everyone,

I have been trying to find information on the procedure to electroless plate MacDermid's Ni-PFTE electroless coating.

This is what I know,

Steps involved:
Alkaline clean
Rinse in DI water
Cathodic electro clean
Rinse in DI water
Woods strike
Electroless plating

What I don't understand:
What are the steps involved for the cathodic electro clean? basically how is this performed?
Why do I have to "activate" the stainless steel with HCl
I have found a lot of different information concerning the Woods Strike...
The most common formulation I have found is
120g/L Nickel chloride
10% vol. HCl
75-100 amp/ft2
3 min @ room temp

Any help would be extremely appreciated as my research does not involve the actual plating, I am testing the effect the plating has on processing equipment.

Thanks in advance!

Jay Bee
Grad student - Boston, Massachusetts, USA



October 20, 2010

Stainless steels can be electrolytically cleaned (cathodic electrocleaning - the job as cathode and platinum or graphite as anode) using an aqueous alkaline solution having a composition of 25 g/l Na2CO3, 35 g/l NaOH and 1 g/l sodium lauryl sulphate (sodium dodecyl sulphate) at 27 oC for 60 seconds.

The surface of stainless steel is covered with a naturally formed passive oxide layer. For electroless deposition, one of the important pre-requisites is the catalytic ability of the surface. Unlike low or medium carbon steel, stainless steels need to be activated. Deposition of a thin layer of nickel would make the surface catalytically active. Theoretically, any nickel containing solution can be used to achieve this. However, a Wood's nickel bath, which contains nickel chloride and hydrochloric acid, is commonly used to activate the surface of stainless steels, as this would also enable a better coating adhesion.

T.S.N. Sankara Narayanan
T.S.N. Sankara Narayanan
- Chennai, Tamilnadu, India
(ed.note Nov. 2017: The good doctor has a fascinating blog at https://advancementinscience.wordpress.com)


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