hard anodize over chem film/alodine?
hard anodize over chem film/alodine?
(OP)
I just read a thread on the issues of applying alodine over hard anodization of 7075 Al Alloy. My issue is just the reverse, applying a hard anodize finish over alodine (chem film). Material is a cast Al Alloy A356 T6. Would like to hear anyone's thoughts on the following spec...
"10. Finish: Bead blast all surfaces specified with glass or polybead meeting MIL-P-85891 (A) screen size 20.
11. Finish: E512 Per MIL-F14072*(F-21, Method IIIB)
12. Finish: Anodize Flat Black per MIL-A-8625 Type III Class 2. (Hard Anodization) Mask where indicated."
Would this work, problems?
Thanks,
Scott
"10. Finish: Bead blast all surfaces specified with glass or polybead meeting MIL-P-85891 (A) screen size 20.
11. Finish: E512 Per MIL-F14072*(F-21, Method IIIB)
12. Finish: Anodize Flat Black per MIL-A-8625 Type III Class 2. (Hard Anodization) Mask where indicated."
Would this work, problems?
Thanks,
Scott





RE: hard anodize over chem film/alodine?
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RE: hard anodize over chem film/alodine?
Regards,
Scott
RE: hard anodize over chem film/alodine?
Hi, Scott.
Switching to 6061 will ensure a more uniform finish.
Colorants are pH sensitive and a little 'touchy' using 7050 or 7075 alloy.
By all means continue bead blasting for your flat, matte finish. And after MIL-A-8625, add your 'Alodine'.
Keep in mind 'Alodine' (Chemfilm) can be applied locally. Immersion isn't required. You'll just have to see what makes the most sense, optically AND economically.
If you need more information, see:
<a href="http://w
Good luck!
William Gunnar
http://www.IndustrialCoatingsWorld.com
RE: hard anodize over chem film/alodine?
Thanks to all for contributing to this most informative (at least to me) discussion!
Scott
RE: hard anodize over chem film/alodine?
Hi, Scott.
I'm glad to help, too.
And thanks for your feedback on my web site. It's appreciated!
Have a great weekend.
William Gunnar
http://www.IndustrialCoatingsWorld.com