finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing

HomeFAQsBooksHelpWantedAdvertiseForum
topic 12402

Bare aluminum corrosion


 

I'm having a honeycomb type panel made from aluminum, and I need a surface flatness of within .002". I'm told the only way to achieve this flatness it to post assembly machine (surface skim) the part. All parts of the assembly will have been anodized prior to assembly. The machining will remove the anodic coating. How will the bare surface corrode over time? and is there any way to refinish the skimmed surface and maintain the flatness?

Thanks,

Paul Labelle
- Kanata, Ontario, Canada


 

0.002" is a pretty liberal allowance when you are speaking of anodizing. Chromic acid anodize the item.

Ted Mooney, finishing.com Teds signature
Ted Mooney, P.E. RET
finishing.com
Pine Beach, New Jersey


 

Paul, You neglected to mention what type of environment your assembly will be exposed to. But, in any case ... if corrosion/oxidation of the bare aluminum is a concern, and the assembly is not going to be exposed to a corrosive environment, perhaps you could Alodine (chromate) the machined areas. This process most likely can be done after the assembly has been machined. Although chromate isn't as "good" as the anodic coating, it certainly is better than uncoated aluminum.

Marc Green
Marc Green
anodizer - Boise, Idaho



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.