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"Nickel plating is peeling off nickel"



Current questions:

Ed. note: Please!
No abstract questions.
Huh?

March 14, 2022

Q. Dear,

Kindly confirm for how many minutes of electricity failure during nickel plating can be tolerated,
or what to do after electricity discontinuity on parts.

Anil Choudhary
QA - Delhi
^


March 2022

A. Hi Anil. Further down on this page I relate a case of defective nickel plated parts where there was no electricity failure, just extremely thin parts being barrel plated and fluttering down instead of remaining in contact because the barrels were rotating far too fast. On the other hand, in duplex nickel plating there is an unavoidable electricity break in moving from semi-bright to bright nickel plating.

So I don't think there is an exact time limit ... rather the situation is that current breaks should be held to a minimum, seconds rather than minutes, so that laminar plating does not result.

Please tell us your situation -- what is happening or what you are planning but unsure about -- rather than posting hypotheticals and in the abstract. It is very difficult to suggest whether to strip the parts, not knowing what the substrate is or how critical they are (medical/aerospace vs. decorative), or to try to re-activate them, or whether to simply scrap them. If your follow up is shorter than my response, it's probably too short :-)   Thanks!

Luck & Regards,

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


March 16, 2022

Q. Hi Mooney,

We are facing electricity failure (Discontinued) during Nickel plating at our supplier sometimes up to 5 minutes (Electricity again come after 5 min) parts in the copper tank or in Nickel tank currently we are scrapping as sometimes we face Ni peel off


Kindly suggest for how may seconds / minutes of electricity failure (Discontinued) parts can be accepted where defect will not be there.

Anil Choudhary [returning]
Head QA - Noida India
^


"The Canning Handbook of Surface Finishing Technology"
from Abe Books
or

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March 2022

A. Hi again. All I can say is that current breaks are well known to cause laminar nickel plating that peels off, and 5 minutes is a very very long time ... so it doesn't surprise me at all that the plating is laminated.

The Canning Handbook seems to suggest that if the current break is noticed immediately it might be possible to just etch the existing plating instead of having to strip it.

Other readers may offer their estimates of how long the power can be off, but I think those current breaks must be fixed rather than asking just exactly how terribly wrong something can be allowed to be before there is no choice but to fix it :-)

Luck & Regards,

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



May 16, 2022

Q. Hi,
I am new in this plating industry and currently we are facing peeling of nickel over nickel. Only the ends and edges of holes of the second coat after shot peeling (at 0.014 A and 8 min) is peeling.
We also did shot peening to the first coat (stainless steel is the metal base) and peeling after shot peening was not observed, only for the second coat.
Both coats were plated with the same sulfamate nickel solution (pH = 4.7), 5 to 7 µm are the thickness of the coats. Have you ever plated nickel over nickel and then applied shot peening? What could be the cause of peeling of only the ends and edges of holes of the second coat after shot peening? How can we avoid this?
Thank you

K vilcarr
shop employee - Lima/Peru
^


nickel book
The Sulphamate Nickel How-To Guide

by David Crotty, PhD & Robert Probert

May 2022

A. Hi K. The shot peening is not the problem, and the ends and edges are not the problem. The problem is that nickel goes passive very quickly so you cannot plate nickel over nickel except immediately.

Why is it necessary to do the nickel plating twice instead of once?

Luck & Regards,

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




Closely related Q&A's, oldest first:

2003

Q. Hi guys!

I'm having some problems with my tiny caps, that go in to making of a fuse. The substrate is brass, plated with copper and then bright nickel. The nickel peels off over nickel. There is no break in nickel plating. The nickel portion remaining in contact with copper is very thin (2-10 microinches). The nickel portion peeling off is thick (100-200 microinches). If you have faced similar problems or have some knowledge about this please send to me your inputs. Thanks in advance for your valuable help.

Regards,

Pravin Aagashe
Consumer Electronics Mfgr. - Bombay, India
^


2003

A. You need to give more information about your nickel solutions.
You say that there is no break in the nickel plating - do you mean in the application of current or in the actual deposit?

If you are using two nickel layers and the first one contains any additives such as brighteners or levelers, this can cause poor adhesion of the second layer, unless it is adequately activated.

More information please

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^


2003

A. Trevor's observations are correct. The most likely cause though is that there is a loss of electrical current or electrical contact during the plating process. This would lead to the nickel deposit becoming "passive" and any consequent nickel deposition would not be fully adherent.

Joseph Garner
trade platers - Corby, Northamptonshire, England, U.K.
^


2005

Q. Actually I am working in semiconductor company. I have many doubts in this fields, so please consider my questions & clear them. My questions are
1) what is meant by peeling, and how we have to find out this?
2) what is meant by blistering?
3) what is meant by uneven, and how do we find out this?

Lakshmanan Chandra Mohan
- India
^


A. Hi, Lakshmanan.
2). Blistering of plating is called blistering because it is very similar to blistering of human skin; it's a separation of the outer skin from the body of the part. It is a precursor to peeling, because the plating has peeled away from the substrate, but until the blister breaks, you don't see the substrate. 1). Peeling means the blister has broken, or the adhesion is so pure that the plating has been removed from the part like opening the cover of a book. 3). "Uneven" almost surely means "uneven thickness of plating", but "uneven" has no specific meaning in plating. Good luck.

Regards,

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



2006

Q. We have a process that we dip a rotating basket with brass pieces in a solution tank. Attached to the tank is a anode and cathode with a 9vdc running at 90amps. Our parts seemed to be getting a double plating and is flaking. Have any ideas what we can look at?

Thanks,

Paul Porter,Jr.

^


2006

A. Are the parts "leaded brass" ? If so you require special service preparation. Clean-rinse-50% Fluoboric Acid -rinse -optional fluoboric acid copper plate -rinse - nickel plate.

The lead forms an insoluble in the regular acid dips normally used for plain brass (sulfuric or hydrochloric). The lead does not form an insoluble with fluoboric acid. So the acid dip change alone may help. However, the lead could also form an insoluble before it got plated in the slow plating barrel. When nickel plate bridges lead oxide - it peels. Ideally, you would first strike in fluoboric acid copper and then your nickel solution would not "see" lead because it would be covered by bonded copper.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina
probertbanner
^


2006

A. You give very little information about your process or conditions, so anyone answering is shooting in the dark. Firstly, what is the surface area of your parts; secondly, what type of nickel are you trying to electrodeposit; thirdly what are your conditions; fourthly what pretreatments are you using; fifthly, what is the brass substrate? Taking the caveat that we haven't a clue about your process, I can only suggest the following. 1) You have an intermittent cathodic connection resulting in a break in current and subsequent delamination of the nickel; 2) do a Hull cell test to make sure the nickel bath is behaving correctly; 3)ensure the plating bath is in spec as far as temperature, pH etc is concerned; 4) ensure your cleaning procedure is correct and in spec; 5)make sure your brass is not leaded - if it is you will see black streaks underneath the peeling nickel and on the brass.

trevor crichton
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
^


A. Hi Paul. You've been offered a good list of possibilities. But I would add one more. If the parts you are plating are very thin and light it is possible that instead of tumbling over each other as they are supposed to, they are being conveyed to the top of the barrel and then fluttering down. I have seen this broken contact cause laminar plating which peels -- the answer in that case is to seriously reduce the barrel rotation speed.

Luck & Regards,

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



Bubbles in barrel Nickel plating

July 20, 2016

Q. Hi,

We are facing bubble issue in our Ni plating process.
The base metal is mild steel and we do semi-bright Nickel plating by barrel method.
The components are small in size like nails.

After plating we found lot of bubbles on the surface. As a part of manufacturing process, we send these components inside a furnace and after this also we found bubbles.

When we analysed, we found organic contamination could be a possibility, because when we did cut section, we found the bubbles are between nickel layers.

We prepared a new nickel bath without any organic additives (no brightener and no other additives) and the result were found to be good. But after few trials, we now see small bubbles again.

Could you please help to identify the root cause?

Thanks

Neel

Neelakandan M
Plating shop employee - Bangalore, Karntaka, India
^


July 2016

A. Hi Neel. Laminar plating is usually caused either by organics (which you have ruled out), or by current interruption. Current interruption can be caused by a rectifier defect (which you may be able to check) or by make-and-break contact (which is an inherent part of barrel plating).

My suggestion, without seeing your plating line, is to try to reduce the speed of barrel rotation. This will allow the parts some additional opportunity to slide over each other while remaining in contact, as opposed to being swiftly carried to the top of the barrel and then have to swim their way back down to the bottom to regain contact. I have seen this suggestion work and would appreciate feedback whether it works for you. Thanks.

Regards,

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


July 21, 2016

A. Hi Neel,

I agree with Ted. Try to maintain component contact with the cathode by adjusting the rotational speed of the barrel. Sodium lauryl sulphate as a wetting agent can also be helpful in aiding sliding of the parts. This is a high foaming surfactant and can cause foaming problems. So beware: add a little and wait to see the effect before adding more. One further point.
Nickel is more inclined to become passive and hence blister during breaks in electrical contact if the pH is high. I suggest running at a pH of 3.5.

Harry

harry_parkes
Harry Parkes
- Birmingham, UK
^


July 27, 2016

thumbs up signThanks for your suggestion. Yes I will check this point and provide you feedback on your suggestion.

Also I will try to attach some pictures of the defect to understand this defect better.

Neel

Neelakandan Murugaiyan
- Bangalore, India
^



February 4, 2022

Ed. note: Please!
No abstract questions.
Huh?

Q. How to calculate current running in tank in electroplating in ASF.

Ani sharma
New in electroplating field - Baddi, India
^


February 2022

A. Hi Ani. I am not sure that I understand your very brief question, but ASF means amperes per square foot. It is a measure of 'current density', the total current flow divided by the surface area of the parts. For example, if the rectifier reads 80 Amps and the total surface area of the parts you are plating is 2 square foot, then the ASF = 40.

Luck & Regards,

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

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