-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

on this site
current topics
topic 2233

Clear vs. Yellow Chromate


Is there any research on a comparison of zinc plating with different chromates?

(Clear vs. Yellow )

Thank you

Bud Kaiser

Download ISO 14000


There sure is. Yellow chromate vastly outlasts clear chromate. See the MFSA "Quality Metal Finishing Guide to Zinc Plating".

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


Clear chromate withstands 16-24 hours in neutral salt spray while yellow withstands 96 hours.

sara michaeli
sara michaeli signature 
Sara Michaeli
chemical process supplier
Tel-Aviv, Israel


Olive drab is the most resistant common chromate with no additional treatment. A lot depends on the operator of the plating line as to what actual production parts really get for hours in the salt spray cabinet, which has a poor relationship as to how it relates to actual use conditions.

James Watts
- Navarre, Florida


There are a new breed of trivalent blue passivates which will provide extended corrosion resistance. When compared to yellow passivation they stand up very well.

Daniel Chaplin


I just finished an extensive study on film coatings on fasteners. The result of the yellow chromate was that it was far better than clear in many different chemical attacks followed by Salt spay tests. If a clear coating is preferred, the JS series is yellow chromate bleached back to clear. This JS series topped all resistance to chemical attack as well as mechanical durability.

Anna Mayhew
- Wisconsin

April 24, 2008

Hi, readers. 1998-2000 was a long time ago in terms of chromating. Probably the majority of chromating done today is trivalent. And in this case the yellow color is just dye which does not enhance the corrosion resistance but may slightly reduce it.


Ted Mooney,
Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site


Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.