finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics

topic 4853

Yellow vs. Black Chromate

(2000)

I simply need to know which will last longer in a continuous salt spray test, a steel part coated with zinc/yellow chromate conversion, or one coated zinc/black chromate conversion, or does it make any difference?

Aaron Acton
- Westfield, Indiana, USA


(2000)

Hi Aaron,

From my understanding, black zinc chromating can last longer in salt spray test. Regards.

Kwok-wai Chook
Hong Kong, China


(2000)

Should it be the other way around that a yellow/iridescent chromate conversion coating last much longer than a black chromate on electrodeposited zinc at a standard 5% salt spray test?

S. Y. Yuen
- Hong Kong, China


(2000)

The yellow lasts longer - 96 hours in 5% ss. But if you are really looking for a long time in SS, try a zinc alloy like zinc iron with black chromate (no silver needed) ,zinc cobalt or zinc nickel.

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



(2000)

I have done many salt spray tests on both. My vote is for yellow!

tim neveau
Tim Neveau
Rochester Hills, Michigan



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

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

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 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.