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topic 55192

Alkaline Zinc Nickel plating process




A discussion started in 2010 but continuing through 2020

June 10, 2010

Kindly suggest us why we have to go for Zinc Nickel plating process for steel and Brass.
If so what type of plating bath is recommended Acidic or Alkaline bath. If alkaline bath any cyanide formation will be there during plating.
Thanking you,
eagerly waiting your reply at the earliest.

Chandramanipg Chandramanipg
Manager Plating & Painting Shop - Bangalore, Karnataka, India


June 11, 2010

The only thing that you HAVE to do is whatever the customer asks for.
Every type of plating solution has at least one reason why you should use it. They all have at least 1 reason why you might not want to use it.
There are hundreds of plating books on the market. Buy some used ones and read a lot.

James Watts
- Navarre, Florida


First of two simultaneous responses -- June 18, 2010

Dear Chandramani,
Alkaline non cyanide bath is available for Zinc Nickel alloy plating from the renowned chemical supply houses

Shankaranarayanan N
- BANGALORE, KARNATAKA, India


Second of two simultaneous responses -- June 18, 2010

Hi,

I would suggest you to go for an alkaline Zinc Nickel bath, but if your job are cast components then an acid bath would be preferable, but the point is you won't get a uniform coating as compared to alkaline bath.

There are job platers Internationally who use both type of baths.

praveen kumar
Praveen Kumar
    plating process supplier
Mumbai, India



June 29, 2010

Dear Chandramani,
A balanced Zinc-Nickel alloy plating deposit provides an excellent level of corrosion protection to components specially under difficult thermal conditions. Automobile Engine components under bonnet is a common example.

Zinc-Nickel deposit, during corrosion produces less volume of white rust powder like that of cadmium.So this can be considered as an alternative to cadmium plating is specific areas.

I will reproduce a portion of my own writing
Quote
"As your basic concern is to have a cyanide free environmentally friendly plating process, you have asked me to explore about the possibilities of replacing Cadmium plating with cyanide free zinc plating.

Cadmium plating have been at the core of military specs for years world wide, its replacement in such a critical area till recently(5 years) had no alternative. U.S military by virtue of concern over using poisonous cyanide and cadmium directed their research to this direction. Now considerable portion of their specs are met with alkaline cyanide free Zinc- Nickel plating process.

Cadmium plating gives good corrosion resistance with low friction, lubricity and solderabilty.It has the advantage of making a barrier layer in between two different metals.
Thus preferred in aerospace industries where aluminum is most in use. During corrosion, the volume of Zinc hydroxide generated in the size as volume is much more than that of cadmium produces and is weaker.Thus cadmium plating cannot be replaced with mere Zinc plating for military applications"
Unquote
Regards

t k mohan
T.K. Mohan
plating process supplier - Mumbai, India



April 27, 2020

Q. Is a rolled depolarized nickel anode bar the correct type of nickel bar for an alkaline zinc-nickel plating bath?

STEVEN CARTER
CARTER ALLOYS CO - phila, Pennsylvania USA


May 2020

A. Hi Steven. Back in 2004 Asif Nurie in topic 29744 offered a good description of his process, noting that inert nickel anodes are used and the nickel additions are made chemically. It could be that things have changed or that other vendors use different methods; if so hopefully someone will post an update here :-)

Regards,

pic of Ted Mooney
Ted Mooney, P.E. RET
finishing.com - Pine Beach, New Jersey
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