PEOPLE helping each other -- No AI, no cost, no reg'n, no damn popups
(As an Amazon Associate & eBay Partner we earn from qualifying purchases)

Curated with aloha by
Ted Mooney, P.E. RET

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

  The authoritative public forum
  for Metal Finishing 1989-2025

-----

Is Chrome passivation needed after zinc phosphating?

Q. There are generally 5 stages pre-treatment process for Galvanised steel. (Cleaner, rinse, Zinc phosphate, rinse, Chrome passivation). I came to know that people face some finishing problems after stage 5 i.e., Chrome passivation. What is the drawback of using Chemical treatment i.e., chrome passivation stage?

Dannu Malpani
agra university - Agra, UP, India
2004

A. Hi Dannu. Chrome post dips (final rinses) are excellent from a performance standpoint, but they leave hexavalent chromium (a carcinogenic toxin) on the part.

Luck & Regards,

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2004

(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: