PEOPLE helping each other -- No AI, no cost, no reg'n, no damn popups
(As an Amazon Associate & eBay Partner we earn from qualifying purchases)

Curated with aloha by
Ted Mooney, P.E. RET

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing 1989-2025

-----

Converting from Cyanide to Alkaline base on Zinc Plating

adv.
this text gets replaced with bannerText

Q. I'm in an industrial training, So the company want me to make an idea belong how to change the Cyanide that are using in Zinc Plating convert to Alkaline base?

Shah
- Malaysia
2005

Tip: This forum was established to build camaraderie among enthusiasts through sharing tips, opinions, pics & personality.
The curator & some readers who publicly share their info will be less likely to engage with those who don't.

A. If you are presently using a cyanide containing zinc bath you are using an ALKALINE CYANIDE bath. If you want to explore a non-cyanide alkaline bath these are widely used. However, it is generally not feasible to convert [do a sliding conversion] from cyanide to non-cyanide because of the extended time required until the cyanide is completely consumed in the process.

Gene Packman
process supplier - Great Neck, New York

A. Mr. Packman, above, is 100% absolutely correct. I express the same thing this way: If you slide you will create more cyanide bearing sludge to haul away than if you just waste treat the whole CN bath and start from scratch with the Caustic & Zinc. I learned that years ago while involved in changing over a 40,000 gallon zinc solution.

Robert H Probert
Robert H Probert Technical Services

Garner, North Carolina

A. Mr Shah

To switch from cyanide to cyanide free plating..
1) plate with MS anodes , stop adds of cyanide and drop zinc and metal to low values.
Maintain caustic at 70 to 75.
When the zinc and cyanide levels fall to 7 gms per liter or so the bath will not plate well. It will stop working at the low values.
Destroy cyanide using Sodium Hypochlorite.
Use the remaining solution as a soak cleaner off line.
Make up a new bath of alkaline cyanide free zinc using proprietary systems from proven suppliers.

Regards

Asif Nurie [deceased] [deceased]
- New Delhi, India
With deep sadness we acknowledge the passing of Asif on Jan 24, 2016

A. Hi!
You can find some useful information on website pfonline.com ~~in section "articles" in article #049702, or~~ ⇩ Google it with text string "pfonline anatomy of a conversion"

Maybe this can be a little bit helpful.

Best regards!

Dimitrij Us
- Kranj, Slovenija (EU)

Ed. note: Pfonline is re-arranged, but the googling works :-)

Indeed it is helpful, Dimitrij. It also suggests replacing cyanide with non-cyanide outright, not wih a sliding conversion.

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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories: