gabilioiu

Topic: NEED HELP WITH HI-SPEED NICKEL

We have in our shop the UNIBRITE 2002 NICKEL plating solution:

(H-ISPEED NICKEL) by ATOTECH CANADA.

Because there are three (3) components to this bath and they can only test for two (2), we have a continuing problem: a cloudy haze appearing on the surface and a difficult time chroming them.

Pieces show round circles of no plate around holes, cutouts and a noticeable white haze in the back of the part.

This is a custom shop and we try to do high caliber work. But lately we are very frustrated as we seem to find no answer to this problem.

Any help appreciated.

DustinGebhardt

Re: NEED HELP WITH HI-SPEED NICKEL

Nickel show around holes and cutouts is fairly common with chrome plating and is not a fault of the nickel bath.  The problem comes from the gassing of the chrome bath while the part plates.  If you are able to plug these holes, I'm sure your problem would go away.  I had the same problem a few years back while making door knobs, which have a small hole in the center to allow you to unlock the door using a small screwdriver or special tool.  We placed a short piece of tubing in the hole to channel the gas and the parts plated beautifully. 


The white haze could be one of several things. 

  1. It could be residual carrier from the nickel bath, which would indicate poor rinsing between the nickel and chrome.  Try changing your rinses and/or increasing your rinse times and see if your problem goes away. 
  2. The parts could also be passivating between the nickel and chrome baths.  Try moving them quickly from station to station to help maintain activity.  You can also add acid to the bath before the chrome to help reactivate the deposit.  You can also use a cathodic acid in this way, too, which is even better for activating a part prior to chrome.  
  3. The nickel deposit could also be heavily built up with organics.  Try doing a peroxide and carbon treatment on the nickel and see how this works. 

-Dustin Gebhardt, CEF

Advanced Manufacturing/Finishing Engineer

Moen

Sanford, NC

jimtrottier

Re: NEED HELP WITH HI-SPEED NICKEL

This could also be a cleaning problem.  I would try taking a couple of parts and scotchbiting them by hand and running them through your system to see if they have the same defects.  If they come out without the haze and non-plate it is in the cleaning end.

DustinGebhardt

Re: NEED HELP WITH HI-SPEED NICKEL

I guess I was assuming the haze was visible only after chrome plate.  

Gabilioiu, can you tell us if you can see the haze immediately after the nickel plate, or only after the chrome plate?

-Dustin Gebhardt, CEF

Advanced Manufacturing/Finishing Engineer

Moen

Sanford, NC

gabilioiu

Re: NEED HELP WITH HI-SPEED NICKEL

You are right: the haze is visible only after chrome plate.

Thanks

DustinGebhardt

Re: NEED HELP WITH HI-SPEED NICKEL

Have you tried any of the suggestions yet?

-Dustin Gebhardt, CEF

Advanced Manufacturing/Finishing Engineer

Moen

Sanford, NC

gabilioiu

Re: NEED HELP WITH HI-SPEED NICKEL

Yes, all but nothing works.

jimtrottier

Re: NEED HELP WITH HI-SPEED NICKEL

  I used to run the Uni-brite NF nickel bath and what papers I still have from Atotech say that low concentrations of Uni-Brite leveler.   (Appearance: The nickel deposit loses some leveling overall and there is a HCD haze).

  Other things we used to do to stop such hazes is to keep the PH of the reclaim tank down and to put  a gallon or two 0f your nickel bath in it to buffer it so to speak, also the rinse tanks between Ni and Cr you should keep the PH regulated to around 4 with Hcl,  This is to insure that your Ni stays active.

  Hope this helps,

    Jim