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 1989-2024

-----

Snowflake corrosion on Duranodic anodized parts

Q. Good day,
I am working with our family business. We are having a problem with our black Duranodic anodize. We are getting snowflake corrosion (stray currents) on some of our parts. We cannot seem to figure out what is the culprit for these stray currents, but have noticed them a lot more on extruded material.

Brittany Morton
- Atlanta, Georgia
October 23, 2023

A. We can't say exactly the source of snowflake type corrosion's is stray current. But if you suspect stray current issue, then firstly you can check grounding of all baths in line (I assume all baths have been grounded). As I say I've encountered this problem a few times over the years; you should consider other possibilities which related chemical or out of chemical reasons, even extrusion process.

Good luck

Alaattin Tuna
- TURKEY,Sakarya
October 25, 2023

finishing.com is made possible by ...
this text gets replaced with bannerText

(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: