Talk Composites - The Forum for Advanced Composites

Galvanic reaction Carbon on Aluminum how to prevent question

http://www.talkcomposites.com/Topic13429.aspx

By JaWillis - 10/25/2014 1:51:20 PM

Any input on this would be appreciated

Maybe you can help me. I will be extending a piece of aluminum tubing by first cutting the tubing then inserting a carbon fiber "ferrule" if you will, to extend the tubing. I will then wrap the splice with carbon fiber tape and resin. 

1. What adhesive can I use at the insertion point to bond the aluminum tubing to the ferrule? Will it there be a galvanic response?
2. What do I put in between the carbon fiber wrap and the Aluminum to prevent galvanization?

My third question is how to adhere your prefab carbon tubing to pre-preg carbon fiber? Example: a 42mm ID tubing which happens to be the exact size id of a bicycle Bottom Bracket PF30. (press fit 30). However I need to beef up the wall thickness by wrapping pre-preg around it, then compress and heat to cure. I am concerned there may be a delamination issue between the tubing and the pre-preg. Is there something I need to treat the tubing with prior to applying pre-preg? 

Thanks in advance for your help.

Jim W
By FLD - 1/26/2015 9:01:19 AM

Does duralac work in this situation?