Embedding Aluminium insert during lamination process

[NPC9092]

Hey, I have a component for which I need to embed some aluminium inserts into a CFRP component during the laminating procedure.

The part consists of a foam core wrapped in carbon. The aluminium inserts are for the connection points.

I was wondering if you could help me with some tips about making a reliable bond between the inserts and the carbon layers.
I have the following plan:
-Sandblast the inserts to obtain a rough surface and remove the oxide layer,
-Treat the surface with 3M AC130 surface pre-treatment,
-Coat inserts with resin to insulate from carbon fibers (avoid galvanic cell),
-Perform lamination (hand laminate)

Please let me know if there is anything that I'm missing.

 

[WKTaylor]

Speaking off-hand, its generally poor practice to install aluminum alloys in carbon-fiber structures for many reasons... unless this is a 'throw-away' space part.

Small size of aluminum pieces VS large mass of carbon is almost assuredly a high corrosion potential 'fight' for any finish that is thin/failed/missing [IE: bare hole].

Carbon fiber and aluminum stiffness mismatch... load strain and thermal strain... could lead to disbonds.

Perhaps You should consider titanium 6AL-4V annealed or 15-5PH CRES H1025-to-H1100... lightly grit blasted and silane coated [or Sol-Gel AC130-variant, etc].



Regards, Wil Taylor

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[weagan22]

Isolate with fiberglass.