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Old 02-06-2017, 08:13 AM   #1
DUCKS2525

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Default Metals and Carbon Fiber?

Aluminum and carbon fiber do not mix right! They kind of act like a battery because of the galvanic corrosion that takes place. What are the other alternatives to using metal with carbon fiber? Mainly for threaded inserts, rivets, dropouts, etc. etc.... Insight on this would be great! Thanks in advance!
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Old 02-06-2017, 11:06 AM   #2
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Insulate with fiberglass or epoxy
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Old 02-07-2017, 06:32 PM   #3
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That's it, just use fiberglass or epoxy?
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Old 02-08-2017, 03:53 AM   #4
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Quote:
Originally Posted by DUCKS2525 View Post
That's it, just use fiberglass or epoxy?
Yes. As long as the metal part is isolated by a thin layer of fiberglass and/or epoxy, there will be no galvanic reaction.
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Old 02-08-2017, 06:44 AM   #5
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That is easy enough! Thanks! What about anodizing? Will the epoxy stick to the anodize?
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Old 02-08-2017, 08:18 AM   #6
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Aluminum and oxygen love to get together- hence why aluminum oxide is one of the most abundant thing on earth. Consequently it's really tough to bond to aluminum and get adequate long-term bond strength without great surface prep like anodizing- and even then it's highly dependent on the prep. Better left to the big boys like Boeing.
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Old 02-08-2017, 10:36 AM   #7
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Quote:
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That is easy enough! Thanks! What about anodizing? Will the epoxy stick to the anodize?
You want phosphoric acid anodizing. It was originally developed by Boeing as a structural bonding surface.
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Old 02-11-2017, 11:59 AM   #8
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Thanks, will be looking into that more!
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Old 02-15-2017, 01:27 PM   #9
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When assembled, expose a tiny area of bare carbon near the aluminum and a small area of bare aluminum. Do a resistance check between the two areas. If it shows anything other than full open you will most definitely get corrosion and the bond will not remain structurally sound long term.
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Old 02-16-2017, 08:16 AM   #10
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Quote:
Originally Posted by polaraligned View Post
You want phosphoric acid anodizing. It was originally developed by Boeing as a structural bonding surface.
I used the PACS system many times for a project with Textron, FedEx, for Sandia Labs
to test the use of bonded Boron for repairs to aircraft aluminum
https://www.heatcon.com/phosphoric-a...em-pacs-video/

This is the report from the project I was on

http://prod.sandia.gov/techlib/acces...007/074088.pdf

I have a VHS tape around here somwhere from it.
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