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Nickel strike plating on stainless steel



A discussion started in 2004 and continuing through 2017 . . .

(2002)

Hello there,

Can anybody tell me which is the most suitable content of HCl (hydrochloric acid) for obtaining a 1 µm thick nickel strike layer on a stainless steel prior to electroless nickel plating?

Please indicate in either ml/l or g/l HCl and quote whether you use 31/33 % HCl acid or 36% HCl acid. Thank you very much in advance for supporting me in this matter!

Best regards,

Thomas Vöhse
- Oberkochen, Germany


simultaneous (2002)

Dear Thomas!

In order to plate (galvaniseren) s/s steel you need a Woods nickel strike. This is made up of approximately 6 oz/gal of nickel as nickel chloride (nickel chloride NICL2 6H2O)in 10 pct by volume hydrochloric acid (Chlorwasserstoffsaure oder Salzsaure)used as room temperature. After a 30-second-to-one- minute strike the parts are directly transferred to the plating tank; thus avoiding any possibility of repassivation during the rinsing cycle.

Gary Patigler
- Richmond, California


(2002)

Dear Thomas,

This is a "Woods bath", 200 g/l HCl 120 g/l NiCl2 room temperature first 1 minute without current, after that 1 A/sq.dm

Andrej Abrosimov
- Kokkola, Finland


(2002)

A. I would suggest you go to the Metal Finishing Guidebook from Metal Finishing magazine and look up the formulation for a Woods Nickel Strike. It is also published in other reference books. This way you have a reference source rather than a message.

Gene Packman
process supplier - Great Neck, New York



November 26, 2016

Q. Dear Andrej Abrosimov,
Why do we want to place it for 1 minute without current in nickel strike?

Ragul Rajendran
- coimbatore, tamilnadu, india.


Electrodeposition -- The Materials Science of Coatings and Substrates

November 2016

A. Hi Ragul. Any time a process like Wood's Nickel is developed, people try variations, and some people will find those variations an improvement. One of those variations is to have the parts start with anodic current or no current, with the belief that this increases the acidic attack on the passive skin on the stainless steel or nickel being activated.

I knew Donald Wood when I was young, but he passed away before I was aware of his developments, so I never had the opportunity to get his thoughts on any proposed variations. But I believe Jack Dini's "Electrodeposition" =>
has the most quantitative information on what works best regarding the Wood's Nickel Strike. Good luck.

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey
Striving to live "Aloha"

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