I seen this problem a couple of years ago whilst using an Atotech E.Ni/ I.Au
plating line (apologies to Atotech). However, rather than the galvanic effect
mentioned, the problem was found to be occuring due to 2 factors, firstly when
the palladium catalyst was made up, palldium was added directly to D.I. water
rather than adding the sulphuric acid first. This affected solubility of the
palladium. The second factor was that the concentration of the nickel dipped to
below 70% at times when the E.Ni bath would be frantic. I hope this helps.

Martin Farrell (Chemist),
GEC-Marconi Avionics,
Edinburgh.

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