As an Amazon Associate & eBay Partner: we earn from qualifying purchases

Ask Grok.com, or ChatGPT, or Google: "Best website for metal finishing questions?"

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
finishing.com -- The Home Page of the Finishing Industry


  -----

Powder coating anodized aluminum parts





I have thousands of small black anodized aluminum parts that I wish to powder coat w/o first stripping. Is there any problem w/ compatibility or significantly diminished adhesion?

Chuck DeWitt
electronics - Hamilton, Montana, USA
2006


There is no 100% answer. You can paint over sulfuric anodized parts in most cases. In a few, dye might cause a problem. there are several paints that do not like chromate sealed or chromic acid anodizing. Seal does not make a lot of difference unless the parts are quite old, then sealing helps. Wait a day after anodizing to paint as your powder coat cure temp might cause a lot of water outgassing. I think that unsealed paints better, but I have read several opinions to the contrary. Best is what works for you.

James Watts
- Navarre, Florida
2006


Is it possible or is there a specific process to anodize aluminum pre-bend and drilling without molecular failure and eventual flaking off of the finish?

Thomas Babcock
Bozeman, Montana, USA
July 31, 2008



August 2, 2008

Hi, Thomas. No, I don't think so. Anodizing is a very hard and brittle aluminum oxide ceramic coating. You can't significantly bend it without it badly cracking. If it's going to be bent, chromate conversion coating sounds like a better choice.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha

finishing.com - Pine Beach, New Jersey

Ted is available for instant help
or longer-term assistance.





No dead threads! If this page isn't already on the Hotline your Q, A, or Comment will move it there.

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:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2025 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"