plating, anodizing, & finishing Q&As since 1989
Does anodize improve coating adhesion?
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,
Mechanical Products - Brookings, SD
"MIL-A-8625, Type II, Class 1 (thickness per Table V (.000029 to .000093)"
metal finishing - San Jose, California, USA
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, CEF
Spartanburg, South Carolina
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, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Q, A, or Comment on THIS thread -or- Start a NEW Thread