Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Hex chrome on pre-galvanized steel coils

We are a stamper that uses pre-galvanized steel coil stock. Automotive is pushing for Hexavalent free material. We are getting mixed information form our suppliers. If you order dry galvanized [either electro or hot dip] that uses a chrome seal to passivate the zinc, does all of the hex chrome breakdown and turn into trivalent after application at the coater? When the coil arrives at our plant is it free of Hex chrome?

EDWARD FARRER
- Lombard, Illinois

Hi, Edward. I don't think there is any substantial breakdown. However much hex chrome they put on the metal is how much will is on the metal.

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

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

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: