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

-----

White powder defect on Black Passivation on Acid Zinc Plating

2006

We are facing a problem of white powder developing on Hexavalent black passivation on zinc plated components. The problem occurs only during monsoon season when their is moisture in air.

Kindly help,

Vinod Kakar
Pervesh Rasayan - Faridabad, Haryana, India

It could be Zinc Oxide (ZnO). Normally zinc would oxidise at temperatures above 400 °C. But maybe with the exposure of moisture and catalysts, oxidation is possible. Find ways to avoid contact with moisture.

Shahrom Mahmud
Univ of Science - Penang, Malaysia
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: