Abstract
The relation between the nickel plating speed and the concentration of ammonia in ammoniacal electroless nickel plating solution containing 0.1M nickel chloride was studied and the highest plating speed was obtained at the ammonia concentration of 0.2-0.3M or at the pH of 8.3-8.5.On the other hand, a curve of nickel deposition potentials at various pH values of the same plating solution was plotted, and it was revealed that a maximum point appeared on the curve when the nickel was in the state of diammino-citrato-nickel complex ion [Ni(Cit)(OH2)(NH3)2]-.
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