No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

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

  The authoritative public forum
  for Metal Finishing 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

(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: