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Standard Nickel Strike Composition

Q. Hello everybody,

I have a question regarding Woods Nickel Strike solution composition and procedure for ferrous alloys before electroless Ni-P plating. I have found several different aspects from various sources.

For example:
ASM Metals Handbook: 240 g/l NiCl2.6H2O - 250ml/l HCl
ASTM B656 STD: 240 g/l NiCl2.6H2O - 320 ml/l HCl, anodic 30-60 sec and then cathodic 2-6 min

A friend of mine working in a German plating company, told me the following recipe: 180 g/l NiCl26H2O - 160 ml/l HCl, just cathodic 3-5 min. I tried it on pieces made of tool steel containing Ni-Cr-Mo and it worked.

Is there a standard optimum composition to work with or everyone is making the strike solution by experience? Does carbon or/and alloying element content of the steel play a role?

Regards,

A. I have seen a few compositions for strike nickel and I assume that the right composition depends on the substrate. I like to work with 120 g/l nickel chloride plus 8-10% v/v hydrochloric acid.

Sara Michaeli
Tel-Aviv-Yafo, Israel

Dear Sara,

Thank you for your response. By saying 10% v/v HCl, I assume you mean 100ml/l, right? Isn't that much less than what bibliography and international standards report?

If you allow me, for which application do you perform nickel strike, before Electroless Ni-P plating or other?

And by the way, because we are first of all people, I believe the whole world is watching the sad events in your region, and I just want to express my sympathy and hope that will end soon in peace.

Regards,

A. Thanks Christos for your kind words. We use this nickel strike for activating stainless steel before plating with EN or electrolytic nickel. You can also use it for activating copper or brass before EN.

Sara Michaeli
Tel-Aviv-Yafo, Israel
 

A. Dear Mr. Sigalas:

Adding to what has already been said, the only precaution we now take because of past experiences is not to reverse cycle on high carbon alloy steels. It severely attacks and smuts your parts. In these cases only forward (obviously hydrogen embrittlement is always a factor to consider in high resistance steels).

Best regards,

Guillermo Marrufo
Monterrey, NL, Mexico

"Electrodeposition: The Materials Science of Coatings & Substrates"
by Jack Dini

on Amazon or eBay
or AbeBooks
(affil link)

A. Hi all,

The only thing I'll add to the discussion is that, yes, there are many opinions on nickel concentration, HCl concentration, and ASF. but Jack Dini, in his "Adhesion" chapter in "Electrodeposition: The Materials Science of Coatings and Substrates" ⇨
actually tested adhesion, and was able to reach adhesion in the astounding 66,000 to 81,000 psi range, and he used 240 g/l Nickel chloride and 120 ml/l HCl ... so that simply can't be a bad formulation  🙂

Luck & Regards,


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