Originally Posted by
cruiserhead
galvanic reaction is between two metals. I have never seen a reaction between carbon epoxy and metal, and it would never touch the carbon since all carbon is within the epoxy resin to give it shape.
It's a known problem in the aircraft and boating industries.
Introduction to Composite Materials
"Carbon fiber composites cause galvanic corrosion of aluminum if the fibers are placed in direct contact with the metal surface, but bonding a glass fabric electrical insulation layer on all interfaces that contact aluminum eliminates this problem."
https://docs.google.com/viewer?a=v&q..._HUwG5Seb3G7Ow
and it happens w/ steel.
Galvanic Corrosion of Carbon and Steel in Aggressive Environments
Read More: http://ascelibrary.org/doi/abs/10.10...001)5%3A3(200)
The demand for the use of carbon-fiber-reinforced plastics (CFRP) in rehabilitation of deteriorating infrastructure is increasing worldwide. The design characteristics of reinforced concrete or steel members can be enhanced significantly by epoxy bonding CFRP laminates to the critically stressed tension areas. There is, however, a concern regarding possible galvanic corrosion when carbon and steel are bonded together. This paper presents the result of a study on the galvanic corrosion between CFRP laminates and steel. A total of 38 specimens made of steel and carbon fibers were prepared and tested. Two simulated aggressive environments and three different amounts of epoxy coating were used in addition to samples with no coating at all. Furthermore, the effect of the sizing agent on the galvanic corrosion rate was investigated, and three different solvents were used to remove the sizing agents from the surface of the carbon fibers. Potentiodynamic polarization and galvanic corrosion tests were conducted. The results of the experiments showed the existence of galvanic corrosion; however, the rate of such corrosion could be decreased significantly by epoxy coating.
Read More: http://ascelibrary.org/doi/abs/10.10...001)5%3A3(200)