Does anyone have experience, eg, predict, in the breakdown of carbon matrix composites and subsequent corrosion of the support structure (usually AL)?
https://www.sciencedirect.com/search?qs=Galvanic+response+of+Aluminum+with+a+Carbon+Matrix+composite+material&authors=&pub=&volume=&issue=&page=&origin=home&zone=qSearch
How about this article? Very old one but it provide results on the rivet joined C/C - Al alloy, C/C - Ti .
Thank you to both Md. Washim Akram and Toshi-Taka Ikeshoji for the valuable reference materials. I will read them with great interest.
We are in the design phase. The portable bridge is intended to cross traverses including waterways, some of which may be of salt water. The structure will be roughly handled by the owners so significant abrasion of the surface and other abuse is expected. A significant concern is the resistance of the aluminum support structure to corrosion from the galvanic interaction with the carbon based composite, as well as the degradation of the composite material. We are trying to model this situation.
It is common practice to add a few plies of fiberglass fibers instead of carbon fibers where galvanic corrosion is expected on aluminum. The resin does not need to change.
Perhaps abuse resistant pads more compatible with aluminum support can be integrated to your design.
Yes, the aluminum is expected to degrade considerably in contact with the carbon fibers themselves (even one fiber sticking out), if its paint or other protection is damaged, in the presence of liquid water at the interface, and even more so with salt water. As the damaged aluminum material thickens, this galvanic corrosion phenomenon slows down due to the distance increasing between the two materials. But at this point non galvanic corrosion of aluminum with salt water shall also proceed faster, the area being hygroscopic and pitted, etc... I do not have precise numerical / figures to offer.
very best
Sylvain
Thank you Sylvain. You hit the nail on the head with your comments that emphasize our concerns as well. We were building a model of the structure and wanted to perform corrosion analysis of the assembly. This would include a "What-if" analysis of using some plies of fiberglass fibers instead of carbon fibers where the galvanic corrosion is observed.
We have not yet developed the prediction engine to perform the analysis, but wish to do so. That is why I initially asked my question to get advice as how to proceed in developing a robust prediction engine.
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