Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Corrosion Resistance of Trivalent Chromate





September 29, 2010

A) As compared to each other, What is the difference between Zinc plating with
1) Trivalent Blue
2) Trivalent Yellow
3) Hexavalent Blue

B) How can material be distinguished by Visual Inspection?

Somnath Patel
Product Designer - Greater Noida, India



September 29, 2010

Hi, Somnath.

Ten years ago, before modern trivalent chromates, the answer would have been that yellow chromate offered far better corrosion resistance than hexavalent blue chromate, which in turn offered far better corrosion resistance than trivalent blue.

Today, trivalent chromates regardless of color are supposed to offer the corrosion resistance of the old yellow hexavalent chromates. Unfortunately it is not possible to determine from visual inspection that chromates are hex-free.

Regards,

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


none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA