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Trouble bonding to electroless nickel plated aluminum

Trouble bonding to electroless nickel plated aluminum

Trouble bonding to electroless nickel plated aluminum

(OP)
I am experiencing an adhesive failure using a silver filled epoxy.  The bond has an adhesive failure at the nickel plated surface.  The aluminum part is plated with a med phosphourous nickel.  The same epoxy  bonded to stainless steel has twice the bond strength and cohesive failure.  any suggestions?

RE: Trouble bonding to electroless nickel plated aluminum

In hybrid chip & wire assembly we used a plasma cleaner immediately prior to die bond with a silver-loaded epoxy. Substrate was either Pd-Ag, gold, or a low-temperature glass, and the plasma cleaning was to remove any organics on the surface which could weaken the bond.
  

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If we learn from our mistakes I'm getting a great education!
 

RE: Trouble bonding to electroless nickel plated aluminum

Surface contamination is the root of most bonding problems as you probably know. I would get a SEM and a scan for surface elements. I would also try Boron Nickel. That sometimes bonds better.

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