No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Zinced + Blue Passivated




Hello,

Someone please teach to solve my question. Actually I was confusing about treatment "zinced + blue passivated" and treatment "trivalent blue". Both of them are similar, same effect or totally different? Please help, and thank you.

Gary Chang
Metal industries employee - Balakong, Selangor, Malaysia
June 10, 2011



Hi, Gary.

Steel components cannot be directly chromate conversion coated ("passivated"). When you hear about it, someone is implying or inferring that the parts were plated with zinc, zinc alloy, or cadmium plated first. Thus "zinc'd + blue passivated" means zinc plated followed by chromate conversion coating, with the chromate being a light pastel blue.

Most, but not all, blue chromate conversion coatings are "trivalent" in recent years to conform with RoHS standards for freedom from hexavalent chromium. But it should always be clearly specified. Slang may be necessary for brevity in some mileaus, but it is context dependent; the minute you take it out of the context in which it was understood, and ask what it means outside of that context as an independent entity, there are 101 opportunities for misunderstandings and mistakes :-)

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 10, 2011




(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:

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


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"