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topic 34023

Haze on Ni-Cr plated surface

Current question and answers:

January 21, 2021

Q. We are doing bright nickel plating followed by decorative chrome plating, we are getting this Haze as seen in the pics, how to remove this.

34023-1b   34023-1a  

We think this is from chrome.
Sulphate in tank was less but even after maintaining proper ratio problem is still there.

Yogesh Jha
- Ludhiana Punjab, India
^-- Answer or Comment on this question --^

----
Ed. note: This appears to be a long-running problem which about which Yogesh posted 1-1/2 years ago.

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February 20, 2021

A. Hi,

ALL different parts are come out hazy or only one kind of part hazy?

Try the piece out after nickel plate -- if it is hazy that means no problem in your chrome tank,; not hazy after nickel but chrome plated part is hazy check your chrome for sulfate, catalyst and ratio.

If part comes out hazy after nickel plate, run the hull cell panel, adjust the brightener, pH and concentration of nickel bath.

POPATBHAI PATEL
- STERLING HEIGHTS, Michigan




Previous closely related Q&A's starting in:

2005

Q. Hello.

I am a engineer in plating part at plumbing fixture factory.

I got trouble with Ni-Cr plating on faucet.(brass substrate)

When buffed condition, there was no prominent defects are found on the surface.

After plating, hazed surface appeared and it was parallel with buff direction.

There are so many opinions in our factory.
...Because of not removed buff compound...
...Because of excessive heat when buffed...
...Bright nickel layer are not sufficiently deposited...
and so on.

Please give me help! Sorry about my poor English.

Jeahyon Joe
trading co. - Incheon City, Incheon, South Korea
^-- Answer or Comment on this question --^

2005

A. Sounds to me like you may have some residual buffing compound that is not being removed sufficiently prior to nickel plating. You don't describe your cleaning process but you might try solvent cleaning the parts prior to your regular alkaline cleaning process.

Also, you could have organic contamination in your nickel. Do you see any evidence of the hazing in your Hull cells? If so, you can narrow it down to nickel pretty quickly. If not, you could have a cleaning and pretreatment problem.

Have you gone a long time since you have dumped cleaners? Are your rinses contaminated? Do you have good quality water?

You have a lot of unknowns present that make it difficult to diagnose your problem. You should go to your chemical suppliers too and have them help you!

Daryl Spindler
Daryl Spindler, CEF
decorative nickel-chrome plating - Greenbrier, Tennessee


2005

A. Dear Mr. Joe,

I think some of your colleagues are right, most of the probability is the buffing compound film that could not be removed during pretreatment and then become haze underneath of your nickel chrome layer. Please check your pretreatment sequences and pretreatment Chemistry whether getting old or not enough.

Are you running a new plating line?

Good luck

Best regards,

Tony L. Chandra
- Jakarta, DKI Jaya, Indonesia


2005

Q. Thank you for the kind answers.

I think there is no problem in our precleaning process.
We did a simple test.
With new paper buff we tried buffing without buff compound.
And we got same hazed surface in our product.
So we made decision that there was lack of buff compound during buffing.

But still there is a problem.
How can I explain this?
Sharp buff edge can make invisible scratch to brass?
And it can appear after plating?

Dear Tony L. Chandra
It's not a new plating line.
Thank you.

Best regards.

Jaehyun Joe [returning]
trading co. - Incheon City, South Korea
^-- Answer or Comment on this question --^

2005

A. HAZED SURFACE AFTER NICKEL PLATING.

INADEQUATE CLEANING INCLUDING ACID DIP.

IN NICKEL TANK,ORGANIC CONTAMINATION, PH OUT OF RANGE, CLEANER PERFORMANCE CAN BE CHECKED BY WATER BREAK TEST.

ajay raina
Ajay Raina
Ludhiana, Punjab, India


2005

A. Hi,

Believe cleaning problem be sorted out, if you see the buffing lines even after plating it means the leveling in nickel is poor and if you are looking for the best leveling go for acid copper with the best leveling organics in acid copper and nickel.

Thanks,

praveen kumar
Praveen Kumar
    plating process supplier
Mumbai, India




Patches on nickel-chrome plated brass parts

September 5, 2014

Q. I am facing an unusual problem of patch on Ni-Cr plating (of brass substrate). The cleaners seem to do well when it comes to water break test, the cleaner sequence is normal soak cleaning, ultrasonic, hydrosonic, periodic reverse cleaning (which is at present being operated only in anodic for about 20 seconds). Each cleaner has a rinse in between.
Finally we have acid activation, followed by Ni and Cr.
The parts, which are wiped properly, do not show any problem as compared to the parts which are not cleaned (not cleaned parts show complete rejection). During the summers same parameters were maintained without changing anything, rejection was about 2%. Now, during the monsoons, maintaining the same parameters the rejection is 100%.
Cleaners are dumped on a frequency of 15 days and filters are changed every day. Difficult to find the root cause.

RAHUL SRIVASTAV
plating line - gurgaon, haryana, india
^-- Answer or Comment on this question --^

August 2014

? Hi Rahul. A problem I am having is I don't know what exactly you mean by "problem of patch". Is the area lacking nickel plating? Is it lacking only chrome plating? Can you please describe these patches or, better yet, send photos to mooney@finishing.com?

Also, I am not quite understanding what you mean by "wiped properly". Do you wipe the the parts with solvent before the cleaning process, or wipe them with a clean towel between cleaning and acid dip? Please help us clearly understand your situation. Thanks.

Regards,

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

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