finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
(current
topics)
topic 7275

Hard Chromium Plating on Nitrided Steels


(2001)

Q. We chromium plate a flash thickness of 500 microinches on mandrel bending dies. We are having difficulty with nitrided-hardened dies. If we do not get them activated properly the first time for plate, we have mis-plating worse each time they are stripped and re-plated. We are using HCl to strip, and it appears we are adversely affecting the part each time. Any suggestions for stripping/reactivating the part for hard chroming would be appreciated.

Ron Schmitt
metal finishers - Colorado Springs, Colorado


(2001)

A. I would try two things:
1st - I would try to strip the chrome in caustic solution with reverse current i.e., electrocleaner;
2nd - with either process I would bake @ 375 °F for 4 hours for hydrogen embrittlement relief.

Chris Snyder
plater - Charlotte, North Carolina


(2001)

Q. Chris is right about stripping any carbon steel with reverse current in caustic. What I want to know is how are you activating the nitrided surface? I haven't had much luck at this.

Thanks,

Pete Faxon
plating shop - Oxnard, California


October 25, 2010 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Sir,

I have a job shop unit, doing Hard chrome (SRHS and new technology Organic base) and Electroless nickel plating (mid phosphorous). I am facing two problems.

1) To plate Hard Chrome Plating 25-35 microns on hardened metals above 65 HRC such as nitriding: Rejection rate is 50%. I normally do 1 minute reverse etching at same current. Some portion of job remains unplated.

2) Hard Chrome Plating on electroless nickel plated jobs: No reverse etching, job is already hot so I put it in live current in hard chrome plating bath. What is the bonding strength of chrome on nickel?

Please suggest me process to ensure minimum rejection. Which is the best metal to plate Hard chrome (bonding)?

Regards,

Tarang Guru
Plating Shop - Ahmedabad, Gujarat, India


August 19, 2013 -- this entry appended to this thread by editor in lieu of spawning a duplicative thread

Q. Has anyone found a way to successfully hard chrome a steel part that has been nitrided? The parts have an ion nitride 2 - 3 thousands thick.

David Peck
Plating shop employee - Leslie, Michigan, USA


A. Hi David. I am not a plater myself, but on some related threads several knowledgable people have suggested starting with a Wood's Nickel Strike for carbonitrided parts -- and it sounds right to me. Good luck.

Regards,

Ted Mooney, finishing.com
Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.