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Surface energy of tin/lead alloys

Surface energy of tin/lead alloys

Surface energy of tin/lead alloys

(OP)
I have an application where I'll be bonding a magnet to a piece of tin/lead coated steel, using a cyanoacrylate.

During prototyping we used a 10/90 tin/lead coating because our plater had that available.
The final assembly will use a 95/5 tin/lead coating.

The bonding strength on the prototypes was marginal.  I was hoping the switch to the 95/5 tin/lead would produce stronger bonds.

Does anyone know the difference in surface energy between the two tin/lead alloys?  I thought that might provide clues to how the adhesive strength will be affected.

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