No registration or passwords; no pop-up ads -- just aloha, fun, & answers.
(as an eBay Partner & Amazon Affiliate earns from qualifying purchases).
Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Advertise
 
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub  Where the
world gathers for metal finishing
Q&As since 1989



-----

Sticky film on my black anodized 6061




I work for a small machine shop in DE that makes aerospace and lasers. A lot of our parts get black anodized. We started with a new plater and have been back and forth with different problems, the latest one involves a sticky film which I believe to be a post treatment problem. I need to go there and would like to know where to start.

Chuck Wieand

2006



First of three simultaneous responses --

It is because of poor sealing: temperature, time, PH value as well as Aluminum hydroxide content related.

John Hu

2006



Second of three simultaneous responses --

Most often, an anodize coating that is sticky means it is not properly sealed.

Very basic mistake - would not give me much faith in the finisher.

David A. Kraft

2006



Third of three simultaneous responses -- 2006

Get a copy of the specification that they are anodizing to - usually this is MIL-A-8625 / MIL-PRF-8625 [affil link or DLA] and there are links to get a copy from the home page of this site. Read that spec, then check to make sure that they are following it.

If they aren't working to a specification, the place to start would be on the job shops list looking for a new anodizer.

Also, very few post treatments would give a sticky film purposefully, and almost all would be done with the customer's knowledge and with an extra expense - However, failing to seal the parts can give them a sticky feeling, so look carefully at that step as well.

Good luck!

Jim Gorsich
Compton, California, USA




(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:

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


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"