-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 10126

Zinc and Yellow Trivalent Plating

I'm having trouble finding someone available to rack plate a small steel part to ASTM B633 [link by ed. to spec at TechStreet] - Zinc plate with yellow chromate using Trivalent chromium. No Cr6+ allowed. I understand platers are moving in this direction to meet US automakers move to eliminate Cr6+ usage next year.

I would appreciate any assistance.

Greg Carrico
- Hanover Park, Illinois


Zinc platings with trivalent chromates are usually clear, not yellow. The only platers I know that do trivalent chrome run clear only. You should consider updating your requirements. I have heard of some trivalent yellow products out there, but I do not know if they work well or are used in production.

tim neveau
Tim Neveau
Rochester Hills, Michigan



The Tri-Valent chromates used to meet the specifications laid down by the various motor companies are clear in color (perhaps sometimes exhibiting a little iridesence) but the corrosion resistance is claimed to be as good as the yellow Cr 6+ chromates , and tests have shown that they are if applied correctly, paying strict attention to the temperature of the chromate (60 - 70 ° C), pH, Concentration, and the agitation.


John Tenison-Woods
John Tenison - Woods
- Victoria Australia

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