Breathe easy! No registration or passwords -- nothing to hack.
... and no maddening pop-up, sticky, or floating ads :-)

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





-----

Does anodize improve coating adhesion?




2006

Does anodize improve adhesion? There seemed to be a difference in the "feel" between the standard aluminum strip and the anodized strip. I had noted more drag or friction on the anodized strip.

The goal is to improve adhesion of a varnish to the strip.

Finally, what should the anodize look like under magnification?

1100-H18, .0045-inch thick aluminum coil

MIL-A-8625 / MIL-PRF-8625 [affil link or DLA], Type II, Class 1 (thickness per Table V (.000029 to .000093)

Thanks in advance,

Larry Boever
Mechanical Products - Brookings, SD



simultaneous

"Adhesive Bonding of Aluminum Alloys"
by Edward Thrall
from Abe Books
or Amazon
(affil links)

2006

"MIL-A-8625, Type II, Class 1 (thickness per Table V (.000029 to .000093)"

Hello, the above statement is a mis-quote from the spec. Actually table V states minimum thickness for type II coatings on 1100 seies aluminum as .000093".

The .000029" is for type I coatings.

Now to answer your question with a question. If adhesion is the issue, why not simply chromate?

Bill Grayson
metal finishing - San Jose, California, USA



2006

Anodizing, preferably not sealed, will improve adhesion as compared to bare aluminum. Chromate film on aluminum is both less expensive and better for paint adhesion if the yellow color is not a problem.

jeffrey holmes
Jeffrey Holmes, CEF
Spartanburg, South Carolina



2006

In addition to Bill's and Jeffrey's helpful responses, please note that there is a phosphoric acid anodizing process (PAA) specifically for the purpose of adhesive bonding. One way of doing that would be under license from Boeing Commercial Products; I believe the process is called BAC5555.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey




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