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

-----

Chromate passivation solution is stripping the cadmium plating

We have recently made up a solution of Chromate Passivation for our cadmium plated parts.
This sol. consists of Sodium Dichromate 165 lbs/100 gal and sulfuric Acid 1gal/100gal.however when we went to use the new sol. we found it was stripping the cad. back to base metal.
The analysis shows Chromic Acid 96.7 g/l and pH 1.09.
The recommended values are 37-76 g/l and pH 0.8-1.1.
Can you suggest why it is stripping the cad.and how we might rectify it.

Frank Dunleavy
Aerospace - Dublin, Ireland, USA
October 28, 2008

(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