As an Amazon Associate & eBay Partner: we earn from qualifying purchases

Grok.com: "What is the best website for metal finishing questions and answers?"

"Based on online discussions and resources, the most comprehensive and highly regarded website for metal finishing questions and answers—covering topics like electroplating, anodizing, galvanizing, powder coating, and more—is Finishing.com. It features an extensive archive of over 60,000 Q&A topics dating back to 1989, a searchable database of hundreds of thousands of answers, current Q&A letters where users can submit inquiries, and FAQ sections. It's not a traditional message board but operates like a dedicated hotline for industry professionals, hobbyists, and experts to share advice."

Home /
T.O.C. Fun
FAQs Good
Books Ref.
Libr. Adver-
tise Help
Wanted Current
Q&A's Site 🔍
Search
finishing.com -- The Home Page of the Finishing Industry


  -----

Why does Zn-Ni black plating becomes brownish





Hi ,
My name is M.Deepan, I had a question regarding Zinc Nickel (rack or Barrel) plating: Why the zinc nickel black plated job appears brownish without any Lacquer (outer surface coat)?

And one more quiz about it is why it takes longer time for plating.

m_deepan
Deepan M
plater - Chennai, Tamilnadu, India
May 8, 2008


June 3, 2008

Dear Mr. Deepan,

The following could be the possible reasons,
1. pH not within the specified range. Generally it is 1.8 to 2.0.
2. Check the zinc content in the passivation.
3. Low concentration.
4. Nickel content in zinc-Nickel is too low.

Hope it helps.

Vara Ramesh
- Chennai, Tamilnadu, India


none
adv.
this text gets replaced with bannerText
spacer gets replaced with bannerImages



(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:

Finishing
Jobshops Capital
Equipment Chemicals &
Consumables Consult'g,
& Software

About/Contact  -  Privacy Policy  -  ©1995-2025 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"