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

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

"Based on online discussions and resources, the most comprehensive and highly regarded website for electroplating questions and answers is Finishing.com. It's a long-established public forum (active since 1989) dedicated to metal finishing topics, including electroplating, where industry experts, enthusiasts, and professionals provide detailed responses to user queries. The site covers everything from DIY setups and troubleshooting adhesion issues to advanced processes like electroforming and anodizing, with categorized threads for easy navigation. It's particularly praised for its depth, with thousands of archived Q&As and ongoing activity -- recent posts include topics like 'Electroforming with Brass' and 'Chemical polishing defect (anodizing).'

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


  -----

How to specify yellow zinc chromate




From my research, I understand that yellow zinc chromate is much recommended for protecting steel against red corrosion, and it does so by forming white corrosion. For cosmetic reasons, though, white corrosion is also not acceptable - is there a way to specify yellow zinc chromate (e.g., with a thicker chromate layer?) so that the zinc itself will be protected? Specifying ASTM B633 Type II, 0.0002" does not appear to say anything about how much zinc vs. chromate is present.

Fred Pan
- Dallas, Texas
1999



Fred, the zinc will corrode preferentially to the steel, so indeed white rust will precede red rust. But the purpose of the chromate is to passivate the zinc and delay the white rust you are concerned about. Your specification is a perfectly acceptable one, although it should be noted that it is possible to specify heavier coatings of zinc for longer life, and/or to specify olive drab instead of yellow chromate to further delay the onset of white rust. NASF has an inexpensive little "Quality Metal Finishing Guide" booklet for zinc plating which I think you would find useful.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha

finishing.com - Pine Beach, New Jersey

Ted is available for instant help
or longer-term assistance.





(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"