No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Color manipulation of chromate anti-corrosion baths

Our current system uses a chromate bath (zinc dichromate on most parts) followed by a powder coat and clear coat to finish our parts. Is it possible to tweak the formulation of the chromate bath to achieve a particular color, thus eliminating the need for the powder coat? The parts are made of zinc.

Talbot Presley
director of research - Palestine, Texas
2006

Look into RoHS issues before becoming too vested in this, but traditional hexavalent chromium conversion coatings are dyeable. The colors are pastel rather than saturated and you can see examples in the green grounding screws on electrical junction boxes, and the "metric blue" coloring of screws, bolts, and studs.

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
2006

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: