No passwords, no registration, no paywalls, no popups, no AI

As an Amazon Associate & eBay Partner we earn from affil links

finishing.com -- The Home Page of the Finishing Industry

Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Al 2xxx Surface Treatments

2000

Is anodizing or alodining the best surface treatment for a 2000 series Al alloy that will be a sealing surface? Silicone o-rings will be used in the treated grooved alloy. Should the mating surface be anodized as well?

Also, is it difficult to process (i.e. surface treat) large parts (14 ft. diameter alloy rings)?

Brian Mayeaux
- Houston,Texas, USA

2000

To anodize such a part you need a very large tank. Companies like Boeing have them, but not many jobshops will. Alodining (a trade name for MIL-C-5541 chromate conversion coating) can probably be done via brushing if necessary. There was a time when the external fuel tanks of the shuttles were chromate conversion coated (I don't know if they still are) and they are obviously very big.

I don't know enough about it to give a dependable answer, but I personally don't know any reason the Alodine should be unsatisfactory.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

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: