Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Incomplete Anodize Finish and Surface Imperfections





December 23, 2008

I'm having a problem with a couple of my aluminum parts. The parts as received have incomplete coverage as well as white streaks.
Tech info:
Material - AMS4027M
Processing Specs:
ANODIZE PARTS PER AMS2471 [affil. link].
PROCESS COMPLETION PERMITTED PER MIL-DTL-5541 [affil. link or DLA] CL-1A OR AMS2473 [affil. link] .

Scott Haenel
manufacturing engineer - Dayton, Ohio



January 5, 2009

Mil-DTL-5541 is a chromate conversion specification, and depending on the type/class a yellow, streaky, non-uniform surface is normal with this finish.

Ryan Cook
Ryan Cook
Toccoa, Georgia



January 7, 2009

Thanks, is there anyway to achieve a more uniform finish? I'm receiving rejection notices for UVC.

Scott Haenel
manufacturing engineer - Dayton, Ohio



January 8, 2009

Scott

You should be able to expect either, or both finishes, to be consistent in appearance on your material (6061-T6). If your part receives both processes, chem film, (mask) and clear anodize, failure to completely remove the chem film in the subsequent cleaning operation will result in white/milky/frosty flaws in the anodize.

A check of the anodize thickness in the suspected areas might be appropriate.

Willie Alexander
- Colorado Springs, Colorado


none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA